Add (at this point faulty) text selection

brittle-ui/src/lib_tab.rs

@@ -155,7 +155,8 @@ pub fn LibTab() -> impl IntoView {
     // ── Initial data load (and reload on repository change) ───────────────────
     let reload_trigger = use_context::<crate::ReloadTrigger>().map(|r| r.0);
     Effect::new(move |_| {
-        if let Some(t) = reload_trigger { t.get(); } // track the trigger
+        let trigger = reload_trigger.map(|t| t.get()).unwrap_or(0);
+        if trigger == 0 { return; } // no repository open yet
         spawn_local(async move {
             match crate::tauri::list_root_libraries().await {
                 Ok(libs) => root_libs.set(libs),
@@ -170,6 +171,8 @@ pub fn LibTab() -> impl IntoView {
     Effect::new(move |_| {
         let lib_id = selected_library.get();
         let query = search_query.get();
+        let trigger = reload_trigger.map(|t| t.get_untracked()).unwrap_or(0);
+        if trigger == 0 { return; } // no repository open yet
         spawn_local(async move {
             let result = match (&lib_id, query.is_empty()) {
                 (Some(id), true) => crate::tauri::list_library_references_recursive(id).await,

brittle-ui/src/lib_tree.rs

@@ -154,6 +154,7 @@ pub fn LibraryTree(
                                         style=format!("padding-left: {indent_px}px")
                                         on:click=move |_| {
                                             cursor.set(i);
+                                            focused.set(Pane::Tree);
                                         }
                                         on:dblclick=move |_| {
                                             if row_may_have_children {

brittle-ui/src/main.rs

@@ -11,6 +11,7 @@ mod tauri;
 
 use std::{
     cell::{Cell, RefCell},
+    collections::HashMap,
     rc::Rc,
 };
 
@@ -128,6 +129,24 @@ pub struct OpenPdfContext(pub RwSignal<Option<PdfOpenRequest>>);
 
 // ── Keymap provider ────────────────────────────────────────────────────────────
 
+/// Per-tab PDF viewer state (zoom + scroll) shared across the app.
+#[derive(Clone, Copy)]
+pub struct PdfStatesContext(
+    pub RwSignal<HashMap<String, crate::tauri::PdfTabState>>,
+);
+
+/// Viewer state update posted by a PDF viewer iframe when zoom/scroll settle.
+#[derive(serde::Deserialize)]
+struct IframeViewerStateMsg {
+    #[serde(rename = "type")]
+    kind: String,
+    #[serde(rename = "refId")]
+    ref_id: String,
+    zoom: f64,
+    #[serde(rename = "scrollTop")]
+    scroll_top: f64,
+}
+
 /// Keydown message forwarded from a child iframe (e.g. the PDF viewer).
 #[derive(serde::Deserialize)]
 struct IframeKeyMsg {
@@ -140,6 +159,25 @@ struct IframeKeyMsg {
     #[serde(rename = "metaKey",  default)] meta:  bool,
 }
 
+async fn save_session_async(
+    tabs: Vec<AppTab>,
+    active_tab: usize,
+    pdf_states: HashMap<String, crate::tauri::PdfTabState>,
+) {
+    let open_tabs = tabs
+        .iter()
+        .filter_map(|t| match t {
+            AppTab::Pdf { ref_id, title } => Some(crate::tauri::PdfTabEntry {
+                ref_id: ref_id.clone(),
+                title:  title.clone(),
+            }),
+            AppTab::Library => None,
+        })
+        .collect();
+    let session = crate::tauri::SessionConfig { open_tabs, active_tab, pdf_states };
+    let _ = crate::tauri::save_session(&session).await;
+}
+
 fn provide_keymap() {
     let state: Rc<RefCell<KeymapState>> =
         Rc::new(RefCell::new(KeymapState::new(default_bindings())));
@@ -295,9 +333,14 @@ fn key_from_parts(key_str: &str, ctrl: bool, shift: bool, alt: bool, meta: bool)
 /// Returns: `(tabs, active_tab)` signals for the view layer.
 fn provide_tabs() -> (RwSignal<Vec<AppTab>>, RwSignal<usize>) {
     // The Library tab is always present at index 0 and cannot be closed.
-    let tabs = RwSignal::new(vec![AppTab::Library]);
+    let tabs       = RwSignal::new(vec![AppTab::Library]);
     let active_tab = RwSignal::new(0usize);
 
+    // Per-tab PDF viewer state (zoom + scroll) keyed by ref_id.
+    let pdf_states =
+        RwSignal::new(HashMap::<String, crate::tauri::PdfTabState>::new());
+    provide_context(PdfStatesContext(pdf_states));
+
     // Provide the open-PDF context so LibTab can post open requests.
     let open_pdf_req = RwSignal::new(Option::<PdfOpenRequest>::None);
     provide_context(OpenPdfContext(open_pdf_req));
@@ -315,6 +358,50 @@ fn provide_tabs() -> (RwSignal<Vec<AppTab>>, RwSignal<usize>) {
         }
     });
 
+    // When a repository opens (or changes), reset tab state and restore the
+    // saved session.  `prev.is_none()` on the first reactive run means no repo
+    // has been opened yet — skip that case.
+    Effect::new(move |prev: Option<()>| {
+        let _ = reload_trigger.get(); // subscribe
+        let Some(()) = prev else { return; };
+
+        // Reset to just the Library tab before restoring.
+        tabs.set(vec![AppTab::Library]);
+        active_tab.set(0);
+        pdf_states.set(HashMap::new());
+
+        leptos::task::spawn_local(async move {
+            let Ok(session) = crate::tauri::get_session().await else { return; };
+            // Set pdf_states first so initial zoom/scroll is available when
+            // PdfViewer components are created by the For loop below.
+            pdf_states.set(session.pdf_states);
+            let mut new_tabs = vec![AppTab::Library];
+            for entry in &session.open_tabs {
+                new_tabs.push(AppTab::Pdf {
+                    ref_id: entry.ref_id.clone(),
+                    title:  entry.title.clone(),
+                });
+            }
+            let count = new_tabs.len();
+            tabs.set(new_tabs);
+            active_tab.set(session.active_tab.min(count.saturating_sub(1)));
+        });
+    });
+
+    // Reactively save session whenever the tab list or active tab changes.
+    // Guard on reload_trigger > 0 to skip saves before any repo is open.
+    Effect::new(move |_| {
+        let _ = tabs.get();       // subscribe
+        let _ = active_tab.get(); // subscribe
+        if reload_trigger.get_untracked() == 0 { return; }
+        let tabs_val = tabs.get_untracked();
+        let active   = active_tab.get_untracked();
+        let states   = pdf_states.get_untracked();
+        leptos::task::spawn_local(async move {
+            let _ = save_session_async(tabs_val, active, states).await;
+        });
+    });
+
     // Tab keymap effects (cycling and closing).
     let keymap_action = use_context::<KeymapAction>().unwrap().0;
     Effect::new(move |_| {
@@ -361,7 +448,7 @@ fn provide_tabs() -> (RwSignal<Vec<AppTab>>, RwSignal<usize>) {
             let new_idx = tabs.with_untracked(Vec::len);
             tabs.update(|t| t.push(AppTab::Pdf {
                 ref_id: req.ref_id.clone(),
-                title: req.title.clone(),
+                title:  req.title.clone(),
             }));
             active_tab.set(new_idx);
         }
@@ -410,6 +497,49 @@ fn App() -> impl IntoView {
     provide_search_query();
     let (tabs, active_tab) = provide_tabs();
 
+    // Access contexts provided by provide_tabs().
+    let pdf_states     = use_context::<PdfStatesContext>().unwrap().0;
+    let reload_trigger = use_context::<ReloadTrigger>().unwrap().0;
+
+    // Listen for viewer state updates (zoom + scroll) posted by PDF viewer
+    // iframes and persist them immediately to the project session file.
+    {
+        use wasm_bindgen::{closure::Closure, JsCast as _};
+        let cb: Closure<dyn Fn(web_sys::MessageEvent)> =
+            Closure::new(move |ev: web_sys::MessageEvent| {
+                let Ok(msg) =
+                    serde_wasm_bindgen::from_value::<IframeViewerStateMsg>(ev.data())
+                else {
+                    return;
+                };
+                if msg.kind != "brittle:viewer-state" {
+                    return;
+                }
+                pdf_states.update(|m| {
+                    m.insert(
+                        msg.ref_id.clone(),
+                        crate::tauri::PdfTabState {
+                            zoom:       msg.zoom,
+                            scroll_top: msg.scroll_top,
+                        },
+                    );
+                });
+                if reload_trigger.get_untracked() > 0 {
+                    let tabs_val = tabs.get_untracked();
+                    let active   = active_tab.get_untracked();
+                    let states   = pdf_states.get_untracked();
+                    leptos::task::spawn_local(async move {
+                        let _ = save_session_async(tabs_val, active, states).await;
+                    });
+                }
+            });
+        if let Some(win) = web_sys::window() {
+            let _ =
+                win.add_event_listener_with_callback("message", cb.as_ref().unchecked_ref());
+        }
+        cb.forget();
+    }
+
     // Mode-switching keymap effect (tab actions are handled inside provide_tabs).
     let keymap_action = use_context::<KeymapAction>().unwrap().0;
     Effect::new(move |_| {
@@ -446,6 +576,13 @@ fn App() -> impl IntoView {
                     }
                     key=|(_, ref_id)| ref_id.clone()
                     children=move |(i, ref_id)| {
+                        // Capture saved state at creation time; the iframe URL
+                        // is static so these values only matter on first mount.
+                        let initial_zoom =
+                            pdf_states.with_untracked(|m| m.get(&ref_id).map(|s| s.zoom));
+                        let initial_scroll_top =
+                            pdf_states.with_untracked(|m| m.get(&ref_id).map(|s| s.scroll_top));
+
                         // Derive visibility reactively: look up the live tabs
                         // so the style updates correctly after tab close/reorder.
                         let ref_id_vis = ref_id.clone();
@@ -468,6 +605,8 @@ fn App() -> impl IntoView {
                                 <PdfViewer
                                     ref_id=ref_id
                                     is_active=Signal::derive(move || is_visible.get())
+                                    initial_zoom=initial_zoom
+                                    initial_scroll_top=initial_scroll_top
                                 />
                             </div>
                         }

brittle-ui/src/pdf_viewer.rs

@@ -18,8 +18,15 @@ use wasm_bindgen::JsValue;
 /// `is_active` indicates whether this is the currently visible PDF tab; when
 /// `true`, keymap actions for PDF page navigation are forwarded into the iframe.
 #[component]
-pub fn PdfViewer(ref_id: String, is_active: Signal<bool>) -> impl IntoView {
-    let url = format!("brittle://app/viewer?ref_id={ref_id}");
+pub fn PdfViewer(
+    ref_id: String,
+    is_active: Signal<bool>,
+    initial_zoom: Option<f64>,
+    initial_scroll_top: Option<f64>,
+) -> impl IntoView {
+    let mut url = format!("brittle://app/viewer?ref_id={ref_id}");
+    if let Some(z) = initial_zoom       { url.push_str(&format!("&zoom={z}")); }
+    if let Some(s) = initial_scroll_top { url.push_str(&format!("&scroll_top={s}")); }
 
     let iframe_ref = NodeRef::<leptos::html::Iframe>::new();
 

brittle-ui/src/pub_list.rs

@@ -56,7 +56,10 @@ pub fn PubList(
                                                 );
                                             }
                                         }
-                                        on:click=move |_| cursor.set(i)
+                                        on:click=move |_| {
+                                            cursor.set(i);
+                                            focused.set(Pane::List);
+                                        }
                                         on:dblclick=move |_| {
                                             cursor.set(i);
                                             if let Some(ctx) = open_pdf_ctx {

brittle-ui/src/tauri.rs

@@ -68,8 +68,41 @@ pub struct LayoutConfig {
     pub center_pane_min: i32,
 }
 
+// ── Session types ─────────────────────────────────────────────────────────────
+
+#[derive(Clone, Default, serde::Deserialize, serde::Serialize)]
+pub struct PdfTabState {
+    pub zoom: f64,
+    pub scroll_top: f64,
+}
+
+#[derive(Clone, serde::Deserialize, serde::Serialize)]
+pub struct PdfTabEntry {
+    pub ref_id: String,
+    pub title: String,
+}
+
+#[derive(Clone, Default, serde::Deserialize, serde::Serialize)]
+pub struct SessionConfig {
+    pub open_tabs: Vec<PdfTabEntry>,
+    pub active_tab: usize,
+    pub pdf_states: std::collections::HashMap<String, PdfTabState>,
+}
+
 // ── Config commands ────────────────────────────────────────────────────────────
 
+/// Return the session state for the currently open project.
+pub async fn get_session() -> Result<SessionConfig, String> {
+    invoke("get_session", &NoArgs {}).await
+}
+
+/// Persist the session state for the currently open project.
+pub async fn save_session(session: &SessionConfig) -> Result<(), String> {
+    #[derive(Serialize)]
+    struct Args<'a> { session: &'a SessionConfig }
+    invoke("save_session", &Args { session }).await
+}
+
 /// Return the last-opened project path from the global config, or `None` if
 /// none was recorded or the directory no longer exists on disk.
 pub async fn get_last_project() -> Result<Option<String>, String> {

scripts/dev.sh

@@ -0,0 +1,6 @@
+#!/bin/sh
+# dev.sh — start both the viewer TypeScript watcher and the Leptos trunk server.
+# Run from the project root (cargo tauri dev sets cwd to src-tauri/../ = project root).
+set -e
+npm --prefix src-tauri/assets/viewer-src run dev &
+cd brittle-ui && trunk serve

src-tauri/assets/viewer-src/.gitignore

@@ -0,0 +1 @@
+node_modules/

src-tauri/assets/viewer-src/build.cjs

@@ -0,0 +1,115 @@
+/**
+ * build.cjs — esbuild script for the PDF viewer TypeScript bundle.
+ *
+ * Produces two output files in ../assets/viewer/:
+ *   viewer.bundle.js        — main viewer (IIFE, no PDF.js included)
+ *   render-worker.bundle.js — render worker (pdf.min.js prepended + IIFE)
+ *
+ * Usage:
+ *   node build.cjs           — one-shot production build (minified)
+ *   node build.cjs --watch   — watch mode for development (unminified)
+ */
+
+const esbuild = require("esbuild");
+const fs      = require("fs");
+const path    = require("path");
+
+const isWatch = process.argv.includes("--watch");
+const minify  = !isWatch;
+
+const ROOT      = __dirname;
+const PDFJS_WORKER_MIN = path.join(ROOT, "../viewer/pdfjs/pdf.worker.min.js");
+const PDFJS_MIN        = path.join(ROOT, "../viewer/pdfjs/pdf.min.js");
+const OUT_DIR          = path.join(ROOT, "../viewer");
+
+// Preamble prepended to the render-worker bundle.
+//
+// Sets `globalThis.window = globalThis` before pdf.worker.min.js runs so that:
+//  1. pdf.worker.min.js does NOT auto-call WorkerMessageHandler.initializeFromPort(self)
+//     (which would hijack our render-worker's own onmessage handler).
+//  2. pdf.worker.min.js DOES set globalThis.pdfjsWorker.WorkerMessageHandler as usual.
+//  3. pdf.min.js's _mainThreadWorkerMessageHandler getter then finds the handler via
+//     globalThis.pdfjsWorker and uses it inline — no document.createElement needed.
+const RENDER_WORKER_PREAMBLE = Buffer.from("globalThis.window=globalThis;\n");
+
+// ── Render-worker plugin: prepend preamble + pdf.worker.min.js + pdf.min.js ───
+//
+// Bundle order matters:
+//   1. Preamble       — sets globalThis.window = globalThis
+//   2. pdf.worker.min.js — sets globalThis.pdfjsWorker.WorkerMessageHandler
+//                          (skips auto-setup because window is now defined)
+//   3. pdf.min.js     — sets globalThis.pdfjsLib; fake-worker path reads pdfjsWorker
+//   4. Compiled TS    — our render-worker code
+function prependPdfjsPlugin() {
+  const pdfjsWorkerMin = fs.readFileSync(PDFJS_WORKER_MIN);
+  const pdfjsMin       = fs.readFileSync(PDFJS_MIN);
+  const NL             = Buffer.from("\n");
+  return {
+    name: "prepend-pdfjs",
+    setup(build) {
+      build.onEnd(result => {
+        if (result.errors.length > 0 || !result.outputFiles) return;
+        const compiled = Buffer.from(result.outputFiles[0].contents);
+        const combined = Buffer.concat([
+          RENDER_WORKER_PREAMBLE,
+          pdfjsWorkerMin, NL,
+          pdfjsMin,       NL,
+          compiled,
+        ]);
+        fs.writeFileSync(path.join(OUT_DIR, "render-worker.bundle.js"), combined);
+        if (!isWatch) console.log("[viewer-src] render-worker.bundle.js written");
+      });
+    },
+  };
+}
+
+async function main() {
+  const sharedOptions = { bundle: true, format: "iife", target: "es2020", minify };
+
+  if (isWatch) {
+    const viewerCtx = await esbuild.context({
+      ...sharedOptions,
+      entryPoints: ["src/viewer.ts"],
+      outfile:     path.join(OUT_DIR, "viewer.bundle.js"),
+    });
+
+    const workerCtx = await esbuild.context({
+      ...sharedOptions,
+      entryPoints: ["src/render-worker.ts"],
+      write:       false,
+      plugins:     [prependPdfjsPlugin()],
+    });
+
+    await viewerCtx.watch();
+    await workerCtx.watch();
+    console.log("[viewer-src] watching for changes…");
+    // Keep the process alive
+    return;
+  }
+
+  // One-shot build
+  await esbuild.build({
+    ...sharedOptions,
+    entryPoints: ["src/viewer.ts"],
+    outfile:     path.join(OUT_DIR, "viewer.bundle.js"),
+  });
+  console.log("[viewer-src] viewer.bundle.js written");
+
+  // Render worker: build to memory then prepend preamble + worker + pdf.min.js
+  const workerResult = await esbuild.build({
+    ...sharedOptions,
+    entryPoints: ["src/render-worker.ts"],
+    write:       false,
+  });
+  const pdfjsWorkerMin = fs.readFileSync(PDFJS_WORKER_MIN);
+  const pdfjsMin       = fs.readFileSync(PDFJS_MIN);
+  const NL             = Buffer.from("\n");
+  const compiled       = Buffer.from(workerResult.outputFiles[0].contents);
+  fs.writeFileSync(
+    path.join(OUT_DIR, "render-worker.bundle.js"),
+    Buffer.concat([RENDER_WORKER_PREAMBLE, pdfjsWorkerMin, NL, pdfjsMin, NL, compiled]),
+  );
+  console.log("[viewer-src] render-worker.bundle.js written");
+}
+
+main().catch(e => { console.error(e); process.exit(1); });

src-tauri/assets/viewer-src/package-lock.json

@@ -0,0 +1,803 @@
+{
+  "name": "brittle-viewer",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "brittle-viewer",
+      "devDependencies": {
+        "esbuild": "^0.25.0",
+        "pdfjs-dist": "^4.10.38",
+        "typescript": "^5.8.0"
+      }
+    },
+    "node_modules/@esbuild/aix-ppc64": {
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+      "cpu": [
+        "ppc64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "aix"
+      ],
+      "engines": {
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+      }
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+        "arm"
+      ],
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+        "arm64"
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+        "url": "https://github.com/sponsors/Brooooooklyn"
+      }
+    },
+    "node_modules/@napi-rs/canvas-win32-arm64-msvc": {
+      "version": "0.1.97",
+      "resolved": "https://registry.npmjs.org/@napi-rs/canvas-win32-arm64-msvc/-/canvas-win32-arm64-msvc-0.1.97.tgz",
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+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">= 10"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/Brooooooklyn"
+      }
+    },
+    "node_modules/@napi-rs/canvas-win32-x64-msvc": {
+      "version": "0.1.97",
+      "resolved": "https://registry.npmjs.org/@napi-rs/canvas-win32-x64-msvc/-/canvas-win32-x64-msvc-0.1.97.tgz",
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+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">= 10"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/Brooooooklyn"
+      }
+    },
+    "node_modules/esbuild": {
+      "version": "0.25.12",
+      "resolved": "https://registry.npmjs.org/esbuild/-/esbuild-0.25.12.tgz",
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+      "hasInstallScript": true,
+      "license": "MIT",
+      "bin": {
+        "esbuild": "bin/esbuild"
+      },
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+      },
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+        "@esbuild/android-arm64": "0.25.12",
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+        "@esbuild/darwin-x64": "0.25.12",
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+        "@esbuild/linux-ia32": "0.25.12",
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+        "@esbuild/linux-ppc64": "0.25.12",
+        "@esbuild/linux-riscv64": "0.25.12",
+        "@esbuild/linux-s390x": "0.25.12",
+        "@esbuild/linux-x64": "0.25.12",
+        "@esbuild/netbsd-arm64": "0.25.12",
+        "@esbuild/netbsd-x64": "0.25.12",
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+        "@esbuild/win32-ia32": "0.25.12",
+        "@esbuild/win32-x64": "0.25.12"
+      }
+    },
+    "node_modules/pdfjs-dist": {
+      "version": "4.10.38",
+      "resolved": "https://registry.npmjs.org/pdfjs-dist/-/pdfjs-dist-4.10.38.tgz",
+      "integrity": "sha512-/Y3fcFrXEAsMjJXeL9J8+ZG9U01LbuWaYypvDW2ycW1jL269L3js3DVBjDJ0Up9Np1uqDXsDrRihHANhZOlwdQ==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=20"
+      },
+      "optionalDependencies": {
+        "@napi-rs/canvas": "^0.1.65"
+      }
+    },
+    "node_modules/typescript": {
+      "version": "5.9.3",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
+      "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "bin": {
+        "tsc": "bin/tsc",
+        "tsserver": "bin/tsserver"
+      },
+      "engines": {
+        "node": ">=14.17"
+      }
+    }
+  }
+}

src-tauri/assets/viewer-src/package.json

@@ -0,0 +1,15 @@
+{
+  "name": "brittle-viewer",
+  "private": true,
+  "scripts": {
+    "build": "tsc --noEmit && node build.cjs",
+    "build:no-check": "node build.cjs",
+    "dev": "node build.cjs --watch",
+    "typecheck": "tsc --noEmit"
+  },
+  "devDependencies": {
+    "esbuild": "^0.25.0",
+    "pdfjs-dist": "^4.10.38",
+    "typescript": "^5.8.0"
+  }
+}

src-tauri/assets/viewer-src/src/page-manager.ts

@@ -0,0 +1,415 @@
+/**
+ * PageManager — page lifecycle: PLACEHOLDER → RENDERING → RENDERED → PLACEHOLDER
+ *
+ * Each page is a sized div (placeholder). When a page enters the buffer zone,
+ * a render job is dispatched to the render worker. When the worker returns an
+ * ImageBitmap, it is swapped into the DOM atomically (old canvas removed and
+ * new canvas appended in the same synchronous turn) so there is never a blank
+ * frame between the old blurry canvas and the new sharp one.
+ *
+ * During CSS zoom (Phase 1 of ZoomController), canvas teardown is suppressed
+ * to prevent dark flashes while intersection data is still settling.
+ */
+
+import { PageState } from "./types.js";
+import type { PageDimensions, TextItem } from "./types.js";
+
+const MAX_CANVAS_PIXELS = 16_777_216; // 4096 × 4096
+
+/**
+ * Compose two 2D affine transforms (each represented as a 6-element array
+ * [a, b, c, d, e, f] matching the CSS matrix() order).
+ */
+function composeTransform(m1: number[], m2: number[]): number[] {
+  // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+  const [a1, b1, c1, d1, e1, f1] = [m1[0]!, m1[1]!, m1[2]!, m1[3]!, m1[4]!, m1[5]!];
+  // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+  const [a2, b2, c2, d2, e2, f2] = [m2[0]!, m2[1]!, m2[2]!, m2[3]!, m2[4]!, m2[5]!];
+  return [
+    a1*a2 + c1*b2,
+    b1*a2 + d1*b2,
+    a1*c2 + c1*d2,
+    b1*c2 + d1*d2,
+    a1*e2 + c1*f2 + e1,
+    b1*e2 + d1*f2 + f1,
+  ];
+}
+
+/**
+ * Clamp render scale so the canvas pixel count stays within budget.
+ * CSS dimensions stay correct — pages appear at the right size, just at
+ * reduced effective DPI when zoomed very high. Same strategy as Chrome's viewer.
+ */
+function clampedRenderScale(
+  vpWidth:      number,
+  vpHeight:     number,
+  desiredScale: number,
+  dpr:          number,
+): number {
+  const w      = vpWidth  * desiredScale * dpr;
+  const h      = vpHeight * desiredScale * dpr;
+  const pixels = w * h;
+  if (pixels <= MAX_CANVAS_PIXELS) return desiredScale * dpr;
+  return desiredScale * dpr * Math.sqrt(MAX_CANVAS_PIXELS / pixels);
+}
+
+/** Called by viewer.ts to send a render job to the worker. */
+export type DispatchRender = (pageNum: number, scale: number, gen: number) => void;
+
+export class PageManager {
+  private readonly _wrapper:        HTMLElement;
+  private readonly _dims:           PageDimensions[];
+  private readonly _dpr:            number;
+  private readonly _dispatchRender: DispatchRender;
+  private readonly _wrappers:       HTMLElement[] = [];
+  // _states[i] tracks the render state of page i+1 (0-indexed).
+  private readonly _states:         PageState[];
+  // _canvases[i] is the canvas currently in the DOM for page i+1, or null.
+  private readonly _canvases:       (HTMLCanvasElement | null)[];
+  // Text selection overlay: raw items from the worker, and the live DOM div.
+  private readonly _rawTextItems:    (TextItem[] | null)[];
+  private readonly _textLayers:      (HTMLDivElement | null)[];
+  // Handle for any in-progress requestIdleCallback text-layer build (per page).
+  private readonly _textBuildHandles: (number | null)[];
+
+  private _scale:     number;
+  private _renderGen: number  = 0;
+  private _inFlight:  number  = 0;
+  private _zooming:   boolean = false;
+
+  constructor(
+    wrapper:        HTMLElement,
+    dims:           PageDimensions[],
+    initialScale:   number,
+    dpr:            number,
+    dispatchRender: DispatchRender,
+  ) {
+    this._wrapper        = wrapper;
+    this._dims           = dims;
+    this._scale          = initialScale;
+    this._dpr            = dpr;
+    this._dispatchRender = dispatchRender;
+    this._states         = new Array<PageState>(dims.length).fill(PageState.PLACEHOLDER);
+    this._canvases       = new Array<HTMLCanvasElement | null>(dims.length).fill(null);
+    this._rawTextItems    = new Array<TextItem[] | null>(dims.length).fill(null);
+    this._textLayers      = new Array<HTMLDivElement | null>(dims.length).fill(null);
+    this._textBuildHandles = new Array<number | null>(dims.length).fill(null);
+
+    this._buildPlaceholders();
+  }
+
+  get pageWrappers(): readonly HTMLElement[] { return this._wrappers; }
+  get numPages():     number                 { return this._dims.length; }
+  get renderGen():    number                 { return this._renderGen; }
+  /** True when no renders are currently in flight (all visible pages are sharp). */
+  get allRendered():  boolean                { return this._inFlight === 0; }
+
+  /** Called by ZoomController to suppress canvas teardown during Phase 1 CSS zoom. */
+  setZooming(z: boolean): void {
+    this._zooming = z;
+    if (!z) return;
+    // Suppress text-layer DOM work for the duration of Phase 1 CSS zoom.
+    // Hiding layers removes their spans from the browser's layout tree so the
+    // CSS zoom loop in applyScale doesn't have to reflow thousands of spans per
+    // page. Cancelling in-progress builds prevents setTimeout chunks from
+    // injecting layout work between wheel events.
+    // setZooming(false) needs no restore — onScaleChange calls _cleanupTextLayer
+    // for every page immediately after, so the hidden divs are removed anyway.
+    for (let i = 0; i < this._dims.length; i++) {
+      this._cancelTextBuild(i);
+      const layer = this._textLayers[i];
+      if (layer) layer.style.display = "none";
+    }
+  }
+
+  private _buildPlaceholders(): void {
+    for (let i = 0; i < this._dims.length; i++) {
+      const dim  = this._dims[i]!;
+      const wrap = document.createElement("div");
+      wrap.className        = "page-wrapper";
+      wrap.dataset["page"]  = String(i + 1);
+      wrap.style.width      = dim.width  * this._scale + "px";
+      wrap.style.height     = dim.height * this._scale + "px";
+      this._wrapper.appendChild(wrap);
+      this._wrappers.push(wrap);
+    }
+  }
+
+  /**
+   * Called on each IntersectionObserver tick.
+   * Dispatches renders for pages entering the buffer (visible pages first).
+   * Cleans up pages that have left the buffer (unless zooming).
+   */
+  reconcile(
+    bufferSet:  ReadonlySet<number>,
+    visibleSet: ReadonlySet<number>,
+  ): void {
+    const gen = this._renderGen;
+
+    // Visible pages first, then off-screen buffered pages.
+    const toRender: number[] = [
+      ...[...visibleSet].sort((a, b) => a - b),
+      ...[...bufferSet].filter(p => !visibleSet.has(p)).sort((a, b) => a - b),
+    ];
+
+    for (const pageNum of toRender) {
+      const i = pageNum - 1;
+      if (i < 0 || i >= this._dims.length) continue;
+      if (this._states[i] === PageState.PLACEHOLDER) {
+        this._startRender(i, gen);
+      }
+    }
+
+    for (let i = 0; i < this._dims.length; i++) {
+      const pageNum = i + 1;
+
+      // Skip teardown during active CSS zoom — IntersectionObserver may report
+      // stale data while layout is still settling, causing premature canvas removal.
+      // onScaleChange (Phase 2) performs the authoritative cleanup.
+      if (!this._zooming && !bufferSet.has(pageNum) && this._states[i] === PageState.RENDERED) {
+        this._cleanup(i);
+      }
+
+      // Cancel in-flight renders that are now out of the buffer.
+      // Leave the canvas in place — removing it would cause a dark flash between
+      // Phase 1 (CSS zoom) and Phase 2 (debounced re-render).
+      if (!bufferSet.has(pageNum) && this._states[i] === PageState.RENDERING) {
+        this._inFlight--;
+        this._states[i] = PageState.PLACEHOLDER;
+      }
+    }
+  }
+
+  private _startRender(i: number, gen: number): void {
+    const dim   = this._dims[i]!;
+    const scale = clampedRenderScale(dim.width, dim.height, this._scale, this._dpr);
+    this._states[i] = PageState.RENDERING;
+    this._inFlight++;
+    this._dispatchRender(i + 1, scale, gen);
+  }
+
+  private _cleanup(i: number): void {
+    if (this._states[i] === PageState.RENDERING) this._inFlight--;
+    this._states[i] = PageState.PLACEHOLDER;
+    const canvas = this._canvases[i];
+    if (canvas) {
+      canvas.remove();
+      this._canvases[i] = null;
+    }
+    this._cleanupTextLayer(i);
+  }
+
+  private _cancelTextBuild(i: number): void {
+    const h = this._textBuildHandles[i];
+    if (h != null) { clearTimeout(h); this._textBuildHandles[i] = null; }
+  }
+
+  private _cleanupTextLayer(i: number): void {
+    this._cancelTextBuild(i);
+    this._textLayers[i]?.remove();
+    this._textLayers[i] = null;
+    // _rawTextItems[i] is intentionally kept — text content is scale-independent
+    // and can be reused to rebuild the overlay after zoom without a worker round-trip.
+  }
+
+  /**
+   * Called when the render worker delivers text content for a page.
+   * Stores the raw items and builds the invisible selection overlay.
+   * If items are already cached (e.g. re-render after zoom), the message is a
+   * no-op — the overlay was already rebuilt from the cache in onScaleChange/onRendered.
+   */
+  onTextContent(pageNum: number, gen: number, items: TextItem[]): void {
+    if (gen !== this._renderGen) return; // stale — a zoom reset superseded this render
+
+    const i = pageNum - 1;
+    if (i < 0 || i >= this._dims.length) return;
+
+    // Already cached from a prior render at this zoom level — skip redundant rebuild.
+    if (this._rawTextItems[i] !== null) return;
+
+    this._rawTextItems[i] = items;
+    this._buildTextLayer(i);
+  }
+
+  private _buildTextLayer(i: number): void {
+    const items = this._rawTextItems[i];
+    if (!items) return;
+
+    this._cancelTextBuild(i);
+
+    const dim  = this._dims[i]!;
+    const wrap = this._wrappers[i]!;
+
+    // Viewport transform: maps PDF coordinates (origin bottom-left, y up) to
+    // CSS pixel coordinates (origin top-left, y down) at the current scale.
+    const S  = this._scale;
+    const vt = [S, 0, 0, -S, 0, dim.height * S];
+
+    // Create and attach the layer div immediately so it is in the DOM even
+    // before any spans are appended (spans are added in idle-time chunks).
+    const layer = document.createElement("div");
+    layer.className = "textLayer";
+    wrap.appendChild(layer);
+    this._textLayers[i] = layer;
+
+    let offset = 0;
+    // Fixed items-per-chunk keeps each callback well under one frame regardless
+    // of how much idle time the scheduler reports. The requestIdleCallback
+    // polyfill always returns timeRemaining()=50, so a time-budget loop would
+    // process every item in one shot — defeating chunking entirely.
+    const CHUNK_SIZE = 150;
+
+    const buildChunk = (): void => {
+      // Bail if the layer was replaced or removed since this chunk was scheduled.
+      if (this._textLayers[i] !== layer) return;
+
+      const end  = Math.min(offset + CHUNK_SIZE, items.length);
+      const frag = document.createDocumentFragment();
+      while (offset < end) {
+        const item = items[offset++]!;
+        if (!item.str) continue;
+        const m    = composeTransform(vt, item.transform);
+        const span = document.createElement("span");
+        span.textContent     = item.str;
+        span.style.transform =
+          `matrix(${m[0]},${m[1]},${m[2]},${m[3]},${m[4]},${m[5]})`;
+        frag.appendChild(span);
+      }
+      layer.appendChild(frag);
+
+      if (offset < items.length) {
+        this._textBuildHandles[i] = setTimeout(buildChunk, 0);
+      } else {
+        this._textBuildHandles[i] = null;
+      }
+    };
+
+    this._textBuildHandles[i] = setTimeout(buildChunk, 0);
+  }
+
+  /**
+   * Called when the render worker returns a finished bitmap.
+   *
+   * Double-buffer swap: the old canvas stays in the DOM until the new one is
+   * ready, then both mutations happen in the same synchronous JS turn so the
+   * browser produces exactly one paint frame for the transition.
+   */
+  onRendered(pageNum: number, gen: number, bitmap: ImageBitmap): void {
+    if (gen !== this._renderGen) { bitmap.close(); return; }
+
+    const i = pageNum - 1;
+    if (
+      i < 0 ||
+      i >= this._dims.length ||
+      this._states[i] !== PageState.RENDERING
+    ) {
+      bitmap.close();
+      return;
+    }
+    this._inFlight--;
+
+    const dim  = this._dims[i]!;
+    const wrap = this._wrappers[i]!;
+    const cssW = dim.width  * this._scale;
+    const cssH = dim.height * this._scale;
+
+    // Build new canvas off-screen (not in DOM yet).
+    const canvas = document.createElement("canvas");
+    canvas.width         = bitmap.width;
+    canvas.height        = bitmap.height;
+    canvas.style.width   = cssW + "px";
+    canvas.style.height  = cssH + "px";
+    canvas.style.display = "block";
+
+    // Zero-copy display via bitmaprenderer; fall back to drawImage if unavailable.
+    const bitmapCtx = canvas.getContext("bitmaprenderer");
+    if (bitmapCtx) {
+      bitmapCtx.transferFromImageBitmap(bitmap);
+    } else {
+      (canvas.getContext("2d") as CanvasRenderingContext2D).drawImage(bitmap, 0, 0);
+      bitmap.close();
+    }
+
+    wrap.style.width  = cssW + "px";
+    wrap.style.height = cssH + "px";
+    // Do NOT reset wrap's CSS zoom here — ZoomController may have advanced it
+    // since the last onScaleChange. The explicit canvas CSS dimensions already
+    // counteract the zoom; resetting it would cause a brief visual scale jump.
+
+    // Atomic DOM swap: old removed + new appended in the same synchronous turn
+    // → the browser paints exactly one frame for the change.
+    const old = this._canvases[i];
+    if (old) old.remove();
+    wrap.appendChild(canvas);
+
+    this._canvases[i] = canvas;
+    this._states[i]   = PageState.RENDERED;
+
+    // Rebuild text layer from cache if available (covers pages that left the
+    // buffer and re-entered, where _cleanupTextLayer removed the DOM div but
+    // kept the raw items — no worker round-trip needed).
+    this._cleanupTextLayer(i);
+    this._buildTextLayer(i);
+  }
+
+  /**
+   * Called after the zoom debounce fires (Phase 2).
+   * Increments renderGen to cancel all stale in-flight renders, resizes
+   * placeholders, then re-dispatches renders for the buffer zone.
+   */
+  onScaleChange(
+    newScale:   number,
+    bufferSet:  ReadonlySet<number>,
+    visibleSet: ReadonlySet<number>,
+  ): void {
+    this._scale = newScale;
+    this._renderGen++;
+
+    for (let i = 0; i < this._dims.length; i++) {
+      const pageNum = i + 1;
+      const dim     = this._dims[i]!;
+      const wrap    = this._wrappers[i]!;
+      const cssW    = dim.width  * newScale;
+      const cssH    = dim.height * newScale;
+      wrap.style.width  = cssW + "px";
+      wrap.style.height = cssH + "px";
+      wrap.style.setProperty("zoom", "1");
+
+      if (bufferSet.has(pageNum)) {
+        // Keep old canvas stretched to the new CSS size so there is no blank
+        // flash while the new render is in flight.  onRendered() will replace
+        // it atomically in the same synchronous JS turn when done.
+        const canvas = this._canvases[i];
+        if (canvas) {
+          canvas.style.width  = cssW + "px";
+          canvas.style.height = cssH + "px";
+        }
+        if (this._states[i] === PageState.RENDERING) this._inFlight--;
+        this._states[i] = PageState.PLACEHOLDER;
+        this._cleanupTextLayer(i);
+      } else {
+        // Off-screen: safe to discard immediately (no visible flash).
+        const canvas = this._canvases[i];
+        if (canvas) { canvas.remove(); this._canvases[i] = null; }
+        this._states[i] = PageState.PLACEHOLDER;
+        // Remove the DOM overlay; raw items are kept for when the page re-enters.
+        this._cleanupTextLayer(i);
+      }
+    }
+
+    this.reconcile(bufferSet, visibleSet);
+  }
+
+  /** Returns the 1-based page number of the topmost visible page. */
+  getCurrentPage(visibleSet: ReadonlySet<number>): number {
+    if (visibleSet.size > 0) return Math.min(...visibleSet);
+    // Fall back to scroll position when no page is intersecting.
+    const top = this._wrapper.parentElement?.getBoundingClientRect().top ?? 0;
+    for (const wrap of this._wrappers) {
+      if (wrap.getBoundingClientRect().bottom > top + 4) {
+        return parseInt(wrap.dataset["page"]!, 10);
+      }
+    }
+    return 1;
+  }
+}

src-tauri/assets/viewer-src/src/render-worker.ts

@@ -0,0 +1,220 @@
+/**
+ * render-worker.ts — off-main-thread PDF rendering via Web Worker.
+ *
+ * NOTE: pdf.min.js is prepended to the compiled output of this file at build
+ * time by build.cjs (see prependPdfjsPlugin). It sets `self.pdfjsLib` as a
+ * global, which this module reads via the declaration below.
+ *
+ * Worker message protocol
+ * ────────────────────────
+ * Main → Worker:
+ *   { type: "init",    pdfData: ArrayBuffer }  (transferred, not copied)
+ *   { type: "render",  pageNum, scale, gen }
+ *   { type: "cleanup" }   — pdfDoc.cleanup(): free internal caches
+ *   { type: "destroy" }   — pdfDoc.destroy() + self.close()
+ *
+ * Worker → Main:
+ *   { type: "ready",    numPages, dims }   — page-1 dim used as stub for all pages
+ *   { type: "rendered", pageNum, gen, bitmap }  (bitmap as transferable)
+ *   { type: "error",    message }
+ *
+ * WebKit nested-worker constraint
+ * ────────────────────────────────
+ * WebKit forbids nested workers (a worker spawning a worker). PDF.js normally
+ * spawns pdf.worker.min.js from wherever it is used — which here would be a
+ * nested worker. Instead, pdf.worker.min.js is bundled into this file (by
+ * build.cjs) preceded by a preamble that sets globalThis.window = globalThis.
+ * This causes pdf.worker.min.js to expose its WorkerMessageHandler on
+ * globalThis.pdfjsWorker without auto-calling initializeFromPort(self). PDF.js
+ * detects the pre-loaded handler via _mainThreadWorkerMessageHandler and runs
+ * inline in this thread — no nested worker creation attempted at all.
+ *
+ * Render queue
+ * ────────────
+ * With disableFontFace: true, every text glyph becomes canvas path operations.
+ * A text-heavy page can require 20 000+ synchronous canvas calls. Running
+ * multiple page renders concurrently exhausts the worker thread and causes
+ * system-wide CPU saturation (perceived UI lock). The queue serialises renders
+ * so exactly one page is active at a time. Incoming render messages for the
+ * same page supersede any queued (but not yet started) request.
+ */
+
+import type { PDFDocumentProxy } from "pdfjs-dist";
+import type { WorkerInbound, WorkerOutbound, PageDimensions, TextItem } from "./types.js";
+
+// pdf.min.js is prepended at build time and sets globalThis.pdfjsLib.
+declare const pdfjsLib: typeof import("pdfjs-dist");
+
+let pdfDoc: PDFDocumentProxy | null = null;
+
+// Custom canvas factory that uses OffscreenCanvas instead of
+// document.createElement("canvas"). Required because this file runs in a Web
+// Worker where `document` is not available. PDF.js uses the factory to create
+// intermediate canvases (e.g. for scaling inline images during page rendering).
+const offscreenCanvasFactory = {
+  create(width: number, height: number) {
+    const canvas  = new OffscreenCanvas(width, height);
+    const context = canvas.getContext("2d")!;
+    return { canvas, context };
+  },
+  reset(
+    item: { canvas: OffscreenCanvas; context: OffscreenCanvasRenderingContext2D | null },
+    width: number,
+    height: number,
+  ) {
+    item.canvas.width  = width;
+    item.canvas.height = height;
+  },
+  destroy(
+    item: { canvas: OffscreenCanvas; context: OffscreenCanvasRenderingContext2D | null },
+  ) {
+    // Release memory by shrinking the canvas; nulling context is cosmetic.
+    item.canvas.width  = 1;
+    item.canvas.height = 1;
+    item.context = null;
+  },
+};
+
+// ── Render queue ──────────────────────────────────────────────────────────────
+
+interface RenderJob { pageNum: number; scale: number; gen: number; }
+
+const renderQueue: RenderJob[] = [];
+let   activeRenders = 0;
+const MAX_CONCURRENT = 1;
+
+function enqueueRender(pageNum: number, scale: number, gen: number): void {
+  // Supersede any already-queued (not yet started) job for the same page.
+  const dup = renderQueue.findIndex(j => j.pageNum === pageNum);
+  if (dup >= 0) renderQueue.splice(dup, 1);
+  renderQueue.push({ pageNum, scale, gen });
+  drainQueue();
+}
+
+function drainQueue(): void {
+  while (activeRenders < MAX_CONCURRENT && renderQueue.length > 0) {
+    const job = renderQueue.shift()!;
+    activeRenders++;
+    handleRender(job.pageNum, job.scale, job.gen).finally(() => {
+      activeRenders--;
+      drainQueue();
+    });
+  }
+}
+
+// ── Message dispatch ──────────────────────────────────────────────────────────
+
+self.onmessage = async (ev: MessageEvent<WorkerInbound>): Promise<void> => {
+  const msg = ev.data;
+  switch (msg.type) {
+    case "init":
+      await handleInit(msg.pdfData);
+      break;
+    case "render":
+      // Enqueue and return immediately; drainQueue() handles concurrency.
+      enqueueRender(msg.pageNum, msg.scale, msg.gen);
+      break;
+    case "cleanup":
+      await pdfDoc?.cleanup();
+      break;
+    case "destroy":
+      renderQueue.length = 0;  // cancel pending jobs
+      if (pdfDoc) { await pdfDoc.destroy(); pdfDoc = null; }
+      self.close();
+      break;
+  }
+};
+
+// ── Handlers ──────────────────────────────────────────────────────────────────
+
+async function handleInit(pdfData: ArrayBuffer): Promise<void> {
+  try {
+    // pdf.worker.min.js is bundled into this file (prepended by build.cjs).
+    // It sets globalThis.pdfjsWorker.WorkerMessageHandler, which PDF.js detects
+    // via its _mainThreadWorkerMessageHandler getter and uses as an inline fake
+    // worker — no nested-worker creation attempted.
+    pdfjsLib.GlobalWorkerOptions.workerSrc =
+      "brittle://app/pdfjs/build/pdf.worker.min.js";
+
+    // disableFontFace: PDF.js normally registers custom fonts via
+    // document.fonts.add() (the Font Loading API). In a Web Worker, `document`
+    // is undefined, so font registration fails and text is invisible. Setting
+    // disableFontFace: true makes PDF.js render all glyphs as canvas vector
+    // paths instead — no browser font API needed, text renders correctly.
+    //
+    // canvasFactory: the installed pdfjs-dist types omit this parameter even
+    // though the runtime API accepts it. `any` cast bypasses the type check.
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    pdfDoc = await pdfjsLib.getDocument({
+      data:            new Uint8Array(pdfData),
+      canvasFactory:   offscreenCanvasFactory,
+      disableFontFace: true,
+    } as any).promise;
+    const numPages = pdfDoc.numPages;
+
+    // Fetch page-1 dimensions so the main thread can lay out placeholders.
+    // Page-1 dims are used as a uniform stub for all pages — accurate for most
+    // academic PDFs (uniform paper size). We deliberately do NOT fetch dims for
+    // every page here: that would tie up the worker with N getPage() calls while
+    // render jobs are already arriving, causing further delays.
+    const firstPage = await pdfDoc.getPage(1);
+    const firstVp   = firstPage.getViewport({ scale: 1.0 });
+    firstPage.cleanup();
+    const stubDim: PageDimensions = { width: firstVp.width, height: firstVp.height };
+
+    const stubDims: PageDimensions[] = Array.from({ length: numPages }, () => stubDim);
+    const out: WorkerOutbound = { type: "ready", numPages, dims: stubDims };
+    self.postMessage(out);
+  } catch (e) {
+    const out: WorkerOutbound = { type: "error", message: String(e) };
+    self.postMessage(out);
+  }
+}
+
+async function handleRender(
+  pageNum: number,
+  scale:   number,
+  gen:     number,
+): Promise<void> {
+  if (!pdfDoc) return;
+  let page = null;
+  try {
+    page = await pdfDoc.getPage(pageNum);
+
+    const vp     = page.getViewport({ scale });
+    const width  = Math.round(vp.width);
+    const height = Math.round(vp.height);
+
+    const offscreen = new OffscreenCanvas(width, height);
+    // OffscreenCanvasRenderingContext2D is assignable to the canvasContext
+    // parameter of page.render(); the cast satisfies the type checker.
+    const ctx = offscreen.getContext("2d") as unknown as CanvasRenderingContext2D;
+
+    // Run canvas rendering and text extraction in parallel — they are independent.
+    const [, textContent] = await Promise.all([
+      page.render({ canvasContext: ctx, viewport: vp }).promise,
+      page.getTextContent(),
+    ]);
+
+    const bitmap = offscreen.transferToImageBitmap();
+    const renderedOut: WorkerOutbound = { type: "rendered", pageNum, gen, bitmap };
+    (self as unknown as Worker).postMessage(renderedOut, [bitmap]);
+
+    // Send text items for the selection overlay. Filter out TextMarkedContent
+    // entries (which lack a `str` field) — we only need actual text runs.
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    const items: TextItem[] = (textContent.items as any[])
+      .filter((item) => typeof item.str === "string")
+      .map(({ str, transform, width, height, hasEOL }: {
+        str: string; transform: number[]; width: number; height: number; hasEOL: boolean;
+      }) => ({ str, transform: Array.from(transform), width, height, hasEOL }));
+    const textOut: WorkerOutbound = { type: "textcontent", pageNum, gen, items };
+    self.postMessage(textOut);
+  } catch (e) {
+    if ((e as Error)?.name !== "RenderingCancelledException") {
+      console.warn("[render-worker] render error page", pageNum, e);
+    }
+  } finally {
+    page?.cleanup();
+  }
+}

src-tauri/assets/viewer-src/src/types.ts

@@ -0,0 +1,53 @@
+// ── Text layer ────────────────────────────────────────────────────────────────
+
+/** A single text item extracted from a PDF page (subset of pdfjs-dist TextItem). */
+export interface TextItem {
+  str: string;
+  transform: number[]; // [a, b, c, d, tx, ty] in PDF coordinate space
+  width: number;
+  height: number;
+  hasEOL: boolean;
+}
+
+// ── Page lifecycle ────────────────────────────────────────────────────────────
+
+export const PageState = {
+  PLACEHOLDER: 0,
+  RENDERING:   1,
+  RENDERED:    2,
+} as const;
+export type PageState = typeof PageState[keyof typeof PageState];
+
+/** Page dimensions at scale=1 (fetched from the render worker at init). */
+export interface PageDimensions {
+  width:  number;
+  height: number;
+}
+
+// ── Render worker message protocol ────────────────────────────────────────────
+
+/** Messages the main thread sends to the render worker. */
+export type WorkerInbound =
+  | { type: "init";    pdfData: ArrayBuffer }
+  | { type: "render";  pageNum: number; scale: number; gen: number }
+  | { type: "cleanup" }
+  | { type: "destroy" };
+
+/**
+ * Messages the render worker sends to the main thread.
+ *
+ * "ready" includes all page dims so the main thread can lay out placeholders
+ * without a second round-trip.
+ */
+export type WorkerOutbound =
+  | { type: "ready";       numPages: number; dims: PageDimensions[] }
+  | { type: "rendered";    pageNum: number; gen: number; bitmap: ImageBitmap }
+  | { type: "textcontent"; pageNum: number; gen: number; items: TextItem[] }
+  | { type: "error";       message: string };
+
+// ── iframe ↔ parent postMessage protocol ─────────────────────────────────────
+
+/** Messages the PDF viewer iframe sends up to the parent Leptos app. */
+export type OutboundMessage =
+  | { type: "brittle:viewer-state"; refId: string; zoom: number; scrollTop: number }
+  | { type: "brittle:keydown"; key: string; ctrlKey: boolean; shiftKey: boolean; altKey: boolean; metaKey: boolean };

src-tauri/assets/viewer-src/src/viewer.ts

@@ -0,0 +1,297 @@
+/**
+ * viewer.ts — PDF viewer orchestrator.
+ *
+ * Rendering is entirely off the main thread: a render worker (render-worker.ts,
+ * with pdf.min.js bundled in) handles all PDF.js calls and canvas rasterisation
+ * via OffscreenCanvas. The main thread only performs DOM manipulation and
+ * receives finished ImageBitmaps for zero-copy display.
+ *
+ * Init sequence:
+ *  1. Fetch render-worker.bundle.js → blob URL → new Worker()
+ *  2. Fetch raw PDF bytes → transfer ArrayBuffer to worker
+ *  3. Worker loads PDF.js, fetches page dims → posts "ready" with dims
+ *  4. Create PageManager (placeholder divs) with received dims
+ *  5. Wire render worker onmessage → pageManager.onRendered()
+ *  6. Create ViewportTracker → IntersectionObserver fires → initial reconcile
+ *  7. Create ZoomController
+ *  8. Register toolbar, keyboard, scroll, and lifecycle handlers
+ */
+
+import { PageManager }     from "./page-manager.js";
+import { ViewportTracker } from "./viewport-tracker.js";
+import { ZoomController }  from "./zoom-controller.js";
+import type { WorkerInbound, WorkerOutbound, OutboundMessage, PageDimensions } from "./types.js";
+
+// requestIdleCallback / cancelIdleCallback polyfills for older WebKitGTK builds.
+if (typeof requestIdleCallback === "undefined") {
+  (self as unknown as Record<string, unknown>)["requestIdleCallback"] =
+    (cb: IdleRequestCallback): ReturnType<typeof setTimeout> =>
+      setTimeout(() => cb({ timeRemaining: () => 50, didTimeout: false }), 1);
+}
+if (typeof cancelIdleCallback === "undefined") {
+  (self as unknown as Record<string, unknown>)["cancelIdleCallback"] =
+    (id: ReturnType<typeof setTimeout>): void => clearTimeout(id);
+}
+
+// ── DOM refs ──────────────────────────────────────────────────────────────────
+const container     = document.getElementById("canvas-container")!;
+const pagesWrapper  = document.getElementById("pages-wrapper")!;
+const statusEl      = document.getElementById("status")!;
+const zoomLabel     = document.getElementById("zoom-label")!;
+const pageIndicator = document.getElementById("page-indicator")!;
+
+// ── URL params ─────────────────────────────────────────────────────────────────
+const params         = new URLSearchParams(location.search);
+const refId          = params.get("ref_id") ?? "";
+const savedZoom      = parseFloat(params.get("zoom") ?? "");
+const savedScrollTop = parseFloat(params.get("scroll_top") ?? "");
+const DPR            = window.devicePixelRatio || 1;
+
+// ── Mutable state ─────────────────────────────────────────────────────────────
+let pageManager:     PageManager     | null = null;
+let viewportTracker: ViewportTracker | null = null;
+let zoomController:  ZoomController  | null = null;
+let renderWorker:    Worker          | null = null;
+
+let currentBufferSet:  ReadonlySet<number> = new Set();
+let currentVisibleSet: ReadonlySet<number> = new Set();
+
+// ── Utilities ──────────────────────────────────────────────────────────────────
+function setStatus(msg: string): void { statusEl.textContent = msg; }
+
+function showError(msg: string): void {
+  const b = document.getElementById("error-banner")!;
+  b.textContent   = msg;
+  b.style.display = "block";
+  setStatus("Error");
+}
+
+function refreshPageIndicator(): void {
+  if (!pageManager) return;
+  const cur = pageManager.getCurrentPage(currentVisibleSet);
+  pageIndicator.textContent = `${cur} / ${pageManager.numPages}`;
+}
+
+function scrollToPage(pageNum: number): void {
+  if (!pageManager) return;
+  const wrap = pageManager.pageWrappers[pageNum - 1];
+  if (!wrap) return;
+  container.scrollTop +=
+    wrap.getBoundingClientRect().top - container.getBoundingClientRect().top;
+}
+
+function sendViewerState(): void {
+  if (!zoomController || window.parent === window) return;
+  const msg: OutboundMessage = {
+    type:      "brittle:viewer-state",
+    refId,
+    zoom:      zoomController.scale,
+    scrollTop: container.scrollTop,
+  };
+  window.parent.postMessage(msg, "*");
+}
+
+/** Send a render job to the worker. Called by PageManager via dispatchRender. */
+function dispatchRender(pageNum: number, scale: number, gen: number): void {
+  const msg: WorkerInbound = { type: "render", pageNum, scale, gen };
+  renderWorker?.postMessage(msg);
+}
+
+// ── Visibility change callback ─────────────────────────────────────────────────
+function onVisibilityChange(
+  bufferSet:  ReadonlySet<number>,
+  visibleSet: ReadonlySet<number>,
+): void {
+  currentBufferSet  = bufferSet;
+  currentVisibleSet = visibleSet;
+  pageManager?.reconcile(bufferSet, visibleSet);
+  refreshPageIndicator();
+}
+
+// ── Fit-to-page scale computation ─────────────────────────────────────────────
+function fitScale(dims: PageDimensions[]): number {
+  const dim = dims[0] ?? { width: 595, height: 842 }; // A4 fallback
+  return Math.max(0.1, Math.min(5.0, Math.min(
+    (container.clientWidth  - 40) / dim.width,
+    (container.clientHeight - 40) / dim.height,
+  )));
+}
+
+// ── Main init ──────────────────────────────────────────────────────────────────
+async function load(): Promise<void> {
+  if (!refId) { showError("No ref_id in URL."); return; }
+  setStatus("Loading…");
+
+  try {
+    // 1. Fetch the worker bundle and the PDF bytes in parallel — they are
+    //    independent, so there is no reason to wait for one before starting
+    //    the other.  The worker is created from a blob URL because Tauri's
+    //    WebView requires workers to be same-origin; blob URLs satisfy that.
+    const [workerBlob, pdfBuf] = await Promise.all([
+      fetch("brittle://app/viewer/render-worker.bundle.js").then(r => r.blob()),
+      fetch(`brittle://app/pdf?ref_id=${encodeURIComponent(refId)}`).then(r => r.arrayBuffer()),
+    ]);
+    renderWorker = new Worker(URL.createObjectURL(workerBlob));
+
+    // 2. Send init message; wait for "ready" (stub dims based on page 1).
+    //    The worker posts "ready" immediately after loading the PDF so the
+    //    main thread unblocks and creates placeholders right away.  A follow-up
+    //    "dims" message with real per-page dimensions arrives shortly after.
+    const { numPages, dims } = await new Promise<{
+      numPages: number;
+      dims: PageDimensions[];
+    }>((resolve, reject) => {
+      renderWorker!.onmessage = (ev: MessageEvent<WorkerOutbound>) => {
+        const msg = ev.data;
+        if (msg.type === "ready") resolve({ numPages: msg.numPages, dims: msg.dims });
+        if (msg.type === "error") reject(new Error(msg.message));
+      };
+      renderWorker!.onerror = e => reject(new Error(e.message));
+      const initMsg: WorkerInbound = { type: "init", pdfData: pdfBuf };
+      renderWorker!.postMessage(initMsg, [pdfBuf]);
+    });
+
+    // 3. Compute initial scale (saved zoom if valid, otherwise fit-to-page).
+    const fitted       = fitScale(dims);
+    const initialScale = (savedZoom > 0)
+      ? Math.max(0.1, Math.min(5.0, savedZoom))
+      : fitted;
+
+    // 4. PageManager — creates N placeholder divs in #pages-wrapper.
+    pageManager = new PageManager(
+      pagesWrapper, dims, initialScale, DPR, dispatchRender,
+    );
+
+    // 5. Wire worker onmessage for ongoing renders and dim corrections.
+    renderWorker.onmessage = (ev: MessageEvent<WorkerOutbound>) => {
+      const msg = ev.data;
+      if (msg.type === "rendered") {
+        pageManager?.onRendered(msg.pageNum, msg.gen, msg.bitmap);
+        refreshPageIndicator();
+        if (pageManager?.allRendered) setStatus("Ready");
+      } else if (msg.type === "textcontent") {
+        pageManager?.onTextContent(msg.pageNum, msg.gen, msg.items);
+      } else if (msg.type === "error") {
+        console.warn("[viewer] worker error:", msg.message);
+      }
+    };
+
+    // 6. ViewportTracker — IntersectionObserver fires once placeholders are in
+    //    the DOM, triggering the initial reconcile automatically.
+    viewportTracker = new ViewportTracker(
+      container,
+      [...pageManager.pageWrappers],
+      onVisibilityChange,
+    );
+
+    // 7. ZoomController — on Phase 2 re-render, also save state.
+    zoomController = new ZoomController(
+      container,
+      pageManager,
+      (newScale, bufferSet, visibleSet) => {
+        pageManager!.onScaleChange(newScale, bufferSet, visibleSet);
+        sendViewerState();
+      },
+      () => ({ bufferSet: currentBufferSet, visibleSet: currentVisibleSet }),
+      zoomLabel,
+      initialScale,
+    );
+
+    // 9. Toolbar buttons
+    document.getElementById("btn-zoom-out")!.addEventListener("click",
+      () => zoomController!.applyScale(zoomController!.scale / 1.25));
+    document.getElementById("btn-zoom-in")!.addEventListener("click",
+      () => zoomController!.applyScale(zoomController!.scale * 1.25));
+    document.getElementById("btn-zoom-fit")!.addEventListener("click",
+      () => zoomController!.applyScale(fitScale(dims)));
+
+    // 10. Keyboard shortcuts + forwarding to parent for global keybindings.
+    document.addEventListener("keydown", ev => {
+      if ((ev.target as HTMLElement).tagName === "INPUT") return;
+      if (ev.key === "+" || ev.key === "=") {
+        ev.preventDefault();
+        zoomController!.applyScale(zoomController!.scale * 1.25);
+      }
+      if (ev.key === "-") {
+        ev.preventDefault();
+        zoomController!.applyScale(zoomController!.scale / 1.25);
+      }
+      if (ev.key === "0") {
+        ev.preventDefault();
+        zoomController!.applyScale(fitScale(dims));
+      }
+      // Forward to parent Leptos app for global keybinding dispatch.
+      if (window.parent !== window) {
+        const msg: OutboundMessage = {
+          type:     "brittle:keydown",
+          key:      ev.key,
+          ctrlKey:  ev.ctrlKey,
+          shiftKey: ev.shiftKey,
+          altKey:   ev.altKey,
+          metaKey:  ev.metaKey,
+        };
+        window.parent.postMessage(msg, "*");
+      }
+    });
+
+    // 11. Scroll → update page indicator + debounced state save.
+    let scrollSaveTimer: ReturnType<typeof setTimeout> | null = null;
+    container.addEventListener("scroll", () => {
+      refreshPageIndicator();
+      if (scrollSaveTimer !== null) clearTimeout(scrollSaveTimer);
+      scrollSaveTimer = setTimeout(sendViewerState, 500);
+    }, { passive: true });
+
+    // 12. Restore saved scroll position (rAF ensures layout is ready).
+    if (savedScrollTop > 0) {
+      requestAnimationFrame(() => { container.scrollTop = savedScrollTop; });
+    }
+
+    // 13. Inbound postMessage from parent Leptos app (page navigation commands).
+    window.addEventListener("message", ev => {
+      if (ev.data === "pdf.page.next") {
+        scrollToPage(Math.min(
+          pageManager!.getCurrentPage(currentVisibleSet) + 1, numPages,
+        ));
+      }
+      if (ev.data === "pdf.page.prev") {
+        scrollToPage(Math.max(
+          pageManager!.getCurrentPage(currentVisibleSet) - 1, 1,
+        ));
+      }
+    });
+
+    // 14. Tab visibility lifecycle: free caches when hidden, re-reconcile on show.
+    document.addEventListener("visibilitychange", () => {
+      if (document.hidden) {
+        renderWorker?.postMessage({ type: "cleanup" } satisfies WorkerInbound);
+      } else {
+        pageManager?.reconcile(currentBufferSet, currentVisibleSet);
+      }
+    });
+
+    // 15. DPR change (e.g., window moved to a different-DPI monitor).
+    matchMedia(`(resolution: ${DPR}dppx)`).addEventListener("change", () => {
+      if (pageManager && zoomController) {
+        pageManager.onScaleChange(
+          zoomController.scale, currentBufferSet, currentVisibleSet,
+        );
+      }
+    });
+
+    // 16. Teardown on unload.
+    window.addEventListener("beforeunload", () => {
+      viewportTracker?.disconnect();
+      renderWorker?.postMessage({ type: "destroy" } satisfies WorkerInbound);
+      renderWorker = null;
+    });
+
+    pageIndicator.textContent = `1 / ${numPages}`;
+    setStatus("Rendering…");
+
+  } catch (e) {
+    showError("Could not load PDF: " + ((e as Error).message ?? String(e)));
+  }
+}
+
+load();

src-tauri/assets/viewer-src/src/viewport-tracker.ts

@@ -0,0 +1,88 @@
+/**
+ * ViewportTracker — dual IntersectionObserver for page visibility detection.
+ *
+ * - visibleSet: pages currently on screen (rootMargin "0px")
+ * - bufferSet:  pages within ~2 viewport heights above/below (rootMargin "200% 0px")
+ *
+ * Both observers schedule a single rAF-deferred notification to prevent stale
+ * data when the two observers fire in separate microtasks for the same layout
+ * change (e.g. buffer removes a page before visible has also removed it).
+ *
+ * Hard invariant enforced before every callback: every visible page is also
+ * in the buffer set.
+ */
+
+type OnVisibilityChange = (
+  bufferSet:  ReadonlySet<number>,
+  visibleSet: ReadonlySet<number>,
+) => void;
+
+export class ViewportTracker {
+  private readonly _onChange:        OnVisibilityChange;
+  private readonly _visibleSet:      Set<number> = new Set();
+  private readonly _bufferSet:       Set<number> = new Set();
+  private _visibleObserver: IntersectionObserver | null = null;
+  private _bufferObserver:  IntersectionObserver | null = null;
+  private _rafPending:      number | null = null;
+
+  constructor(
+    root:         HTMLElement,
+    pageWrappers: HTMLElement[],
+    onChange:     OnVisibilityChange,
+  ) {
+    this._onChange = onChange;
+    this._observe(root, pageWrappers);
+  }
+
+  private _observe(root: HTMLElement, pageWrappers: HTMLElement[]): void {
+    const scheduleNotify = (): void => {
+      if (this._rafPending !== null) return;
+      this._rafPending = requestAnimationFrame(() => {
+        this._rafPending = null;
+        // Hard invariant: every visible page must also be in the buffer.
+        for (const p of this._visibleSet) this._bufferSet.add(p);
+        this._onChange(new Set(this._bufferSet), new Set(this._visibleSet));
+      });
+    };
+
+    this._visibleObserver = new IntersectionObserver(entries => {
+      for (const e of entries) {
+        const page = parseInt((e.target as HTMLElement).dataset["page"]!, 10);
+        if (e.isIntersecting) this._visibleSet.add(page);
+        else                  this._visibleSet.delete(page);
+      }
+      scheduleNotify();
+    }, { root, rootMargin: "0px", threshold: 0 });
+
+    this._bufferObserver = new IntersectionObserver(entries => {
+      for (const e of entries) {
+        const page = parseInt((e.target as HTMLElement).dataset["page"]!, 10);
+        if (e.isIntersecting) this._bufferSet.add(page);
+        else                  this._bufferSet.delete(page);
+      }
+      scheduleNotify();
+    }, { root, rootMargin: "200% 0px", threshold: 0 });
+
+    for (const wrap of pageWrappers) {
+      this._visibleObserver.observe(wrap);
+      this._bufferObserver.observe(wrap);
+    }
+  }
+
+  /** Observe a newly-added page wrapper (unused currently, kept for extensibility). */
+  observe(wrap: HTMLElement): void {
+    this._visibleObserver?.observe(wrap);
+    this._bufferObserver?.observe(wrap);
+  }
+
+  disconnect(): void {
+    this._visibleObserver?.disconnect();
+    this._bufferObserver?.disconnect();
+    this._visibleSet.clear();
+    this._bufferSet.clear();
+    if (this._rafPending !== null) {
+      cancelAnimationFrame(this._rafPending);
+      this._rafPending = null;
+    }
+  }
+}

src-tauri/assets/viewer-src/src/zoom-controller.ts

@@ -0,0 +1,161 @@
+/**
+ * ZoomController — two-phase zoom pipeline.
+ *
+ * Phase 1 (instant, every event):
+ *   CSS `zoom` property on each .page-wrapper = newScale / renderScale
+ *   Scroll position adjusted to keep the anchor point fixed
+ *   Zoom label updated immediately
+ *
+ * Phase 2 (debounced, 250ms after last event):
+ *   pageManager.onScaleChange(newScale, bufferSet, visibleSet)
+ *   Pages re-rendered at native resolution via the render worker
+ *
+ * Ctrl+Scroll events within a single frame are coalesced via rAF; the 250ms
+ * debounce starts from inside the rAF callback so it begins after the last
+ * event in a burst.
+ */
+
+import type { PageManager } from "./page-manager.js";
+
+// Must match the CSS constants in index.html:
+//   #pages-wrapper { padding: 20px 0; gap: 12px; }
+const CONTENT_PADDING_TOP = 20;
+const PAGE_GAP            = 12;
+
+export interface BufferSnapshot {
+  bufferSet:  ReadonlySet<number>;
+  visibleSet: ReadonlySet<number>;
+}
+
+type OnReRender = (
+  newScale:   number,
+  bufferSet:  ReadonlySet<number>,
+  visibleSet: ReadonlySet<number>,
+) => void;
+
+export class ZoomController {
+  static readonly ZOOM_MIN = 0.1;
+  static readonly ZOOM_MAX = 5.0;
+
+  private readonly _container:  HTMLElement;
+  private readonly _pm:         PageManager;
+  private readonly _onReRender: OnReRender;
+  private readonly _getBuffer:  () => BufferSnapshot;
+  private readonly _zoomLabel:  HTMLElement;
+
+  private _scale:       number;
+  private _renderScale: number;
+  private _debounce:    ReturnType<typeof setTimeout> | null = null;
+  private _rafPending:  number | null = null;
+
+  constructor(
+    container:    HTMLElement,
+    pageManager:  PageManager,
+    onReRender:   OnReRender,
+    getBuffer:    () => BufferSnapshot,
+    zoomLabel:    HTMLElement,
+    initialScale: number,
+  ) {
+    this._container  = container;
+    this._pm         = pageManager;
+    this._onReRender = onReRender;
+    this._getBuffer  = getBuffer;
+    this._zoomLabel  = zoomLabel;
+    this._scale      = initialScale;
+    this._renderScale = initialScale;
+
+    this._updateLabel();
+    this._bindScrollZoom();
+  }
+
+  get scale(): number { return this._scale; }
+
+  clamp(s: number): number {
+    return Math.max(ZoomController.ZOOM_MIN, Math.min(ZoomController.ZOOM_MAX, s));
+  }
+
+  private _updateLabel(): void {
+    this._zoomLabel.textContent = Math.round(this._scale * 100) + "%";
+  }
+
+  /**
+   * Apply a new zoom level.
+   *
+   * @param newScale - Target zoom scale.
+   * @param anchorY  - Pixel offset within container to hold fixed (default: center).
+   * @param anchorX  - Pixel offset within container to hold fixed (default: center).
+   */
+  applyScale(newScale: number, anchorY?: number, anchorX?: number): void {
+    const container = this._container;
+    const oldScale  = this._scale;
+    this._scale     = this.clamp(newScale);
+    this._updateLabel();
+    this._pm.setZooming(true);
+
+    if (anchorY === undefined) anchorY = container.clientHeight / 2;
+    if (anchorX === undefined) anchorX = container.clientWidth  / 2;
+
+    // Compute the non-scaling portion of content above the anchor point.
+    // Gaps and padding are fixed-size (do not scale with zoom), so a naive
+    // `(scrollTop + anchorY) × ratio` formula accumulates one error of
+    // `GAP × (ratio − 1)` per gap above the anchor — enough to visibly drift
+    // the anchor point on long documents.
+    const anchorContentY = container.scrollTop + anchorY;
+    let fixedAbove = CONTENT_PADDING_TOP;
+    let cumY       = CONTENT_PADDING_TOP;
+    for (const wrap of this._pm.pageWrappers) {
+      const zoom = parseFloat(wrap.style.getPropertyValue("zoom") || "1") || 1;
+      const h    = parseFloat(wrap.style.height) * zoom;
+      if (cumY + h > anchorContentY) break;
+      cumY       += h + PAGE_GAP;
+      fixedAbove += PAGE_GAP;
+    }
+
+    // Phase 1: instant CSS zoom feedback (no re-render yet)
+    const cssZoom = this._scale / this._renderScale;
+    for (const wrap of this._pm.pageWrappers) {
+      wrap.style.setProperty("zoom", String(cssZoom));
+    }
+
+    // Exact scroll anchor: scale only the page-content portion; the fixed
+    // portion (gaps + padding) does not change.
+    //   T_new = fixedAbove + (T_old + anchorY − fixedAbove) × ratio − anchorY
+    const ratio    = this._scale / oldScale;
+    const scalable = container.scrollTop + anchorY - fixedAbove;
+    container.scrollTop  = Math.max(0, fixedAbove + scalable * ratio - anchorY);
+    container.scrollLeft = Math.max(0, (container.scrollLeft + anchorX) * ratio - anchorX);
+
+    this._scheduleReRender();
+  }
+
+  private _scheduleReRender(): void {
+    if (this._rafPending !== null) cancelAnimationFrame(this._rafPending);
+    this._rafPending = requestAnimationFrame(() => {
+      this._rafPending = null;
+      if (this._debounce !== null) clearTimeout(this._debounce);
+      this._debounce = setTimeout(() => this._triggerReRender(), 250);
+    });
+  }
+
+  private _triggerReRender(): void {
+    this._pm.setZooming(false); // Phase 2: onScaleChange handles the cleanup
+    this._renderScale = this._scale;
+    const { bufferSet, visibleSet } = this._getBuffer();
+    this._onReRender(this._scale, bufferSet, visibleSet);
+  }
+
+  private _bindScrollZoom(): void {
+    this._container.addEventListener("wheel", ev => {
+      if (!ev.ctrlKey) return;
+      ev.preventDefault();
+      const rect    = this._container.getBoundingClientRect();
+      const anchorY = ev.clientY - rect.top;
+      const anchorX = ev.clientX - rect.left;
+      this.applyScale(
+        this._scale * (ev.deltaY < 0 ? 1.1 : 1 / 1.1),
+        anchorY,
+        anchorX,
+      );
+    }, { passive: false });
+  }
+}

src-tauri/assets/viewer-src/tsconfig.json

@@ -0,0 +1,12 @@
+{
+  "compilerOptions": {
+    "target": "ES2020",
+    "module": "ES2020",
+    "moduleResolution": "bundler",
+    "lib": ["ES2020", "DOM", "DOM.Iterable", "WebWorker"],
+    "strict": true,
+    "noUncheckedIndexedAccess": true,
+    "skipLibCheck": true
+  },
+  "include": ["src"]
+}

src-tauri/assets/viewer/index.html

@@ -71,7 +71,7 @@
       font-size: 12px;
     }
 
-    /* Scrollable viewport — contains the zoomed pages wrapper */
+    /* Scrollable viewport — contains the pages wrapper */
     #canvas-container {
       flex: 1;
       overflow-y: auto;
@@ -79,8 +79,7 @@
       background: #1d2021;
     }
 
-    /* Inner column that receives the CSS zoom for instant visual feedback.
-       CSS zoom (unlike transform) affects layout, so scrollbars stay correct. */
+    /* Column of page placeholders/canvases */
     #pages-wrapper {
       display: flex;
       flex-direction: column;
@@ -91,17 +90,49 @@
       margin: 0 auto;
     }
 
-    .page-wrapper { flex-shrink: 0; }
+    /* Each page: sized div that holds a canvas once rendered.
+       White background makes unrendered placeholders look like blank pages. */
+    .page-wrapper {
+      flex-shrink: 0;
+      position: relative;
+      background: #fff;
+      box-shadow: 0 3px 14px rgba(0, 0, 0, 0.55);
+    }
 
     .page-wrapper canvas {
       display: block;
-      background: #fff;
-      box-shadow: 0 3px 14px rgba(0, 0, 0, 0.55);
+    }
+
+    /* Invisible text overlay for native selection. Spans are positioned via
+       CSS matrix() derived from PDF text transforms; color:transparent keeps
+       the canvas visible while the browser handles selection normally. */
+    .textLayer {
+      position: absolute;
+      inset: 0;
+      overflow: hidden;
+      z-index: 2;
+      line-height: 1;
+      text-size-adjust: none;
+      forced-color-adjust: none;
+    }
+
+    .textLayer span {
+      color: transparent;
+      position: absolute;
+      white-space: pre;
+      cursor: text;
+      transform-origin: 0% 0%;
+      font-size: 1px;
+      user-select: text;
+      -webkit-user-select: text;
+    }
+
+    .textLayer ::selection {
+      background: rgba(100, 160, 255, 0.35);
     }
   </style>
 </head>
 <body>
-
   <div id="error-banner"></div>
 
   <div id="toolbar">
@@ -112,309 +143,13 @@
       <button id="btn-zoom-fit" title="Fit width  [ 0 ]">Fit</button>
     </div>
     <span id="page-indicator">— / —</span>
-    <span id="status">Loading PDF.js…</span>
+    <span id="status">Loading…</span>
   </div>
 
-  <div id="canvas-container"></div>
+  <div id="canvas-container">
+    <div id="pages-wrapper"></div>
+  </div>
 
-  <script src="brittle://app/pdfjs/build/pdf.min.js"></script>
-  <script>
-    "use strict";
-
-    const refId = new URLSearchParams(location.search).get("ref_id") || "";
-
-    const pdfjsLib = window.pdfjsLib;
-    if (!pdfjsLib) {
-      showError("PDF.js failed to load. Make sure the app is running inside Brittle.");
-    } else {
-      pdfjsLib.GlobalWorkerOptions.workerSrc =
-        "brittle://app/pdfjs/build/pdf.worker.min.js";
-
-      const container     = document.getElementById("canvas-container");
-      const statusEl      = document.getElementById("status");
-      const zoomLabel     = document.getElementById("zoom-label");
-      const pageIndicator = document.getElementById("page-indicator");
-
-      const DPR      = window.devicePixelRatio || 1;
-      const ZOOM_MIN = 0.1;
-      const ZOOM_MAX = 5.0;
-
-      let pdfDoc            = null;
-      let scale             = 1.0;  // desired display scale
-      let renderScale       = 1.0;  // scale at which pagesWrapper canvases are rendered
-      let renderGen         = 0;    // incremented on each render to cancel stale passes
-      let renderTimer       = null;
-      let pagesWrapper      = null; // the current #pages-wrapper element
-      let pendingRenderTask = null; // the active page.render() RenderTask, if any
-
-      // ── Utilities ──────────────────────────────────────────────────────────
-
-      function setStatus(msg) { statusEl.textContent = msg; }
-
-      function clampScale(s) {
-        return Math.max(ZOOM_MIN, Math.min(ZOOM_MAX, s));
-      }
-
-      function updateZoomLabel() {
-        zoomLabel.textContent = Math.round(scale * 100) + "%";
-      }
-
-      // ── Zoom ───────────────────────────────────────────────────────────────
-
-      // anchorY/anchorX: offsets within the container to keep fixed on screen.
-      // Default to the centre of the visible area.
-      function applyScale(
-        newScale,
-        anchorY = container.clientHeight / 2,
-        anchorX = container.clientWidth  / 2,
-      ) {
-        const oldScale      = scale;
-        const oldScrollTop  = container.scrollTop;
-        const oldScrollLeft = container.scrollLeft;
-        scale = clampScale(newScale);
-        updateZoomLabel();
-
-        const ratio   = scale / oldScale;
-        const cssZoom = scale / renderScale;
-
-        // Apply CSS zoom to each page wrapper individually — NOT to the flex
-        // container.  This keeps the container's padding and gap constant, so
-        // page positions are identical before and after the background re-render
-        // (no jump when the re-render swaps in naturally-sized canvases).
-        if (pagesWrapper) {
-          for (const wrap of pagesWrapper.children) {
-            wrap.style.zoom = cssZoom;
-          }
-        }
-
-        // Keep the document point under the cursor at the same screen position.
-        container.scrollTop  = Math.max(0, (oldScrollTop  + anchorY) * ratio - anchorY);
-        container.scrollLeft = Math.max(0, (oldScrollLeft + anchorX) * ratio - anchorX);
-
-        scheduleRender();
-      }
-
-      async function fitToWidth() {
-        if (!pdfDoc) return scale;
-        const page  = await pdfDoc.getPage(1);
-        const vp    = page.getViewport({ scale: 1.0 });
-        const avail = container.clientWidth - 40;
-        return clampScale(avail / vp.width);
-      }
-
-      // ── Rendering ──────────────────────────────────────────────────────────
-
-      function scheduleRender() {
-        clearTimeout(renderTimer);
-        renderTimer = setTimeout(renderAll, 300);
-      }
-
-      async function renderAll() {
-        if (!pdfDoc) return;
-        pendingRenderTask?.cancel();
-        pendingRenderTask = null;
-        const gen         = ++renderGen;
-        const targetScale = scale;
-
-        const savedScrollTop  = container.scrollTop;
-        const savedScrollLeft = container.scrollLeft;
-
-        // Build new wrapper with pre-sized canvases derived from the old ones.
-        // Pre-sizing means the scroll range is correct the instant we swap, so
-        // savedScrollTop/Left can be restored exactly without a jump.
-        const newWrapper = document.createElement("div");
-        newWrapper.id = "pages-wrapper";
-
-        const wrappers = [];
-        for (let i = 1; i <= pdfDoc.numPages; i++) {
-          const wrap   = document.createElement("div");
-          wrap.className    = "page-wrapper";
-          wrap.dataset.page = String(i);
-          const canvas = document.createElement("canvas");
-
-          if (pagesWrapper) {
-            const oldCanvas = pagesWrapper.children[i - 1]?.querySelector("canvas");
-            if (oldCanvas?.style.width) {
-              const ratio = targetScale / renderScale;
-              canvas.style.width  = Math.round(parseFloat(oldCanvas.style.width)  * ratio) + "px";
-              canvas.style.height = Math.round(parseFloat(oldCanvas.style.height) * ratio) + "px";
-            }
-          }
-
-          wrap.appendChild(canvas);
-          newWrapper.appendChild(wrap);
-          wrappers.push(wrap);
-        }
-
-        // For zoom re-renders: pre-render the currently visible pages (1–2)
-        // before the DOM swap.  Only a small number of pages, so off-screen is
-        // fast; the swap then reveals already-drawn content with no white flash.
-        // Skipped for the initial load (pagesWrapper is null) where progressive
-        // in-DOM rendering is preferable.
-        const preRendered = new Set();
-        if (pagesWrapper) {
-          const first = getCurrentPage();
-          const last  = Math.min(first + 1, pdfDoc.numPages);
-          for (let p = first; p <= last; p++) {
-            if (renderGen !== gen) return;
-            await renderPage(wrappers[p - 1], p, targetScale);
-            preRendered.add(p - 1);
-          }
-        }
-
-        if (renderGen !== gen) return;
-
-        // Swap into DOM — visible pages are already rendered on re-render.
-        // DOM mutations + scroll restore are synchronous, landing in one paint.
-        container.innerHTML = "";
-        container.appendChild(newWrapper);
-        pagesWrapper = newWrapper;
-        renderScale  = targetScale;
-        container.scrollTop  = savedScrollTop;
-        container.scrollLeft = savedScrollLeft;
-
-        // Render remaining pages in-DOM (GPU-accelerated, progressive).
-        for (let i = 0; i < wrappers.length; i++) {
-          if (preRendered.has(i)) continue;
-          if (renderGen !== gen) return;
-          await renderPage(wrappers[i], i + 1, targetScale);
-        }
-
-        if (renderGen !== gen) return;
-        setStatus("Ready");
-        refreshPageIndicator();
-      }
-
-      async function renderPage(wrapper, pageNum, targetScale) {
-        let task = null;
-        try {
-          const page   = await pdfDoc.getPage(pageNum);
-          const vp     = page.getViewport({ scale: targetScale * DPR });
-          const canvas = wrapper.querySelector("canvas");
-          if (!canvas) return;
-
-          canvas.width  = vp.width;
-          canvas.height = vp.height;
-          canvas.style.width  = Math.round(vp.width  / DPR) + "px";
-          canvas.style.height = Math.round(vp.height / DPR) + "px";
-
-          task = page.render({ canvasContext: canvas.getContext("2d"), viewport: vp });
-          pendingRenderTask = task;
-          await task.promise;
-        } catch (e) {
-          if (e?.name !== "RenderingCancelledException") console.warn("render:", e);
-        } finally {
-          if (pendingRenderTask === task) pendingRenderTask = null;
-        }
-      }
-
-      // ── Page indicator and page navigation ─────────────────────────────────
-
-      // Returns the 1-based number of the topmost visible page.
-      function getCurrentPage() {
-        const top = container.getBoundingClientRect().top;
-        for (const wrap of container.querySelectorAll(".page-wrapper")) {
-          if (wrap.getBoundingClientRect().bottom > top + 4) {
-            return parseInt(wrap.dataset.page, 10);
-          }
-        }
-        return 1;
-      }
-
-      function refreshPageIndicator() {
-        if (!pdfDoc) return;
-        pageIndicator.textContent = getCurrentPage() + " / " + pdfDoc.numPages;
-      }
-
-      // Scroll so that the top of page `pageNum` aligns with the container top.
-      // getBoundingClientRect() is used so CSS zoom is accounted for correctly.
-      function scrollToPage(pageNum) {
-        const wrap = container.querySelector(`.page-wrapper[data-page="${pageNum}"]`);
-        if (!wrap) return;
-        container.scrollTop +=
-          wrap.getBoundingClientRect().top - container.getBoundingClientRect().top;
-      }
-
-      container.addEventListener("scroll", refreshPageIndicator, { passive: true });
-
-      // Page-navigation commands posted from the outer Leptos app (fired when
-      // a global keymap action such as pdf.page.next/prev is dispatched while
-      // this tab is active, regardless of which element has keyboard focus).
-      window.addEventListener("message", ev => {
-        if (ev.data === "pdf.page.next" && pdfDoc)
-          scrollToPage(Math.min(getCurrentPage() + 1, pdfDoc.numPages));
-        if (ev.data === "pdf.page.prev" && pdfDoc)
-          scrollToPage(Math.max(getCurrentPage() - 1, 1));
-      });
-
-      // ── Load ───────────────────────────────────────────────────────────────
-
-      async function load() {
-        if (!refId) { showError("No ref_id in URL."); return; }
-        setStatus("Loading…");
-        try {
-          const url = "brittle://app/pdf?ref_id=" + encodeURIComponent(refId);
-          pdfDoc = await pdfjsLib.getDocument({ url }).promise;
-
-          scale       = await fitToWidth();
-          renderScale = scale;
-          updateZoomLabel();
-          setStatus("Rendering…");
-          await renderAll();
-        } catch (e) {
-          showError("Could not load PDF: " + e.message);
-        }
-      }
-
-      // ── Toolbar buttons ────────────────────────────────────────────────────
-
-      document.getElementById("btn-zoom-out").addEventListener("click",
-        () => applyScale(scale / 1.25));
-      document.getElementById("btn-zoom-in").addEventListener("click",
-        () => applyScale(scale * 1.25));
-      document.getElementById("btn-zoom-fit").addEventListener("click",
-        async () => applyScale(await fitToWidth()));
-
-      // Ctrl+Scroll — anchor at the cursor position.
-      container.addEventListener("wheel", ev => {
-        if (!ev.ctrlKey) return;
-        ev.preventDefault();
-        const rect   = container.getBoundingClientRect();
-        const anchorY = ev.clientY - rect.top;
-        const anchorX = ev.clientX - rect.left;
-        applyScale(scale * (ev.deltaY < 0 ? 1.1 : 1 / 1.1), anchorY, anchorX);
-      }, { passive: false });
-
-      // Keyboard shortcuts (active when the iframe has focus).
-      // Also forwards every keydown to the parent window so global keybindings
-      // (tab switching, etc.) keep working when the PDF view has focus.
-      document.addEventListener("keydown", ev => {
-        if (ev.target.tagName === "INPUT") return;
-        if (ev.key === "+" || ev.key === "=") { ev.preventDefault(); applyScale(scale * 1.25); }
-        if (ev.key === "-")                    { ev.preventDefault(); applyScale(scale / 1.25); }
-        if (ev.key === "0")                    { ev.preventDefault(); fitToWidth().then(applyScale); }
-        // Forward to the parent Leptos document for the global keymap.
-        if (window.parent !== window) {
-          window.parent.postMessage({
-            type: "brittle:keydown",
-            key: ev.key,
-            ctrlKey:  ev.ctrlKey,
-            shiftKey: ev.shiftKey,
-            altKey:   ev.altKey,
-            metaKey:  ev.metaKey,
-          }, "*");
-        }
-      });
-
-      load();
-    }
-
-    function showError(msg) {
-      const b = document.getElementById("error-banner");
-      b.textContent = msg;
-      b.style.display = "block";
-      document.getElementById("status").textContent = "Error";
-    }
-  </script>
+  <script src="brittle://app/viewer/viewer.bundle.js"></script>
 </body>
 </html>

src-tauri/src/commands/config.rs

@@ -2,7 +2,9 @@
 
 use std::path::Path;
 
-use crate::config::{GlobalConfig, ProjectConfig};
+use crate::config::{GlobalConfig, ProjectConfig, SessionConfig};
+use crate::state::AppState;
+use tauri::State;
 
 /// Load the global config from `~/.config/brittle/config.toml`.
 /// Returns the default config if the file does not yet exist.
@@ -80,6 +82,32 @@ pub fn get_layout_config() -> Result<crate::config::LayoutConfig, String> {
         .map_err(|e| e.to_string())
 }
 
+/// Return the session state for the currently open project.
+///
+/// Returns `Default` if no session has been saved yet.
+/// Errors if no repository is open.
+#[tauri::command]
+pub fn get_session(state: State<AppState>) -> Result<SessionConfig, String> {
+    let guard = state.brittle.lock().map_err(|_| "lock poisoned".to_string())?;
+    let brittle = guard.as_ref().ok_or_else(|| "no repository open".to_string())?;
+    ProjectConfig::load(brittle.repository_root())
+        .map(|c| c.session)
+        .map_err(|e| e.to_string())
+}
+
+/// Persist the session state for the currently open project.
+///
+/// Errors if no repository is open.
+#[tauri::command]
+pub fn save_session(state: State<AppState>, session: SessionConfig) -> Result<(), String> {
+    let guard = state.brittle.lock().map_err(|_| "lock poisoned".to_string())?;
+    let brittle = guard.as_ref().ok_or_else(|| "no repository open".to_string())?;
+    let root = brittle.repository_root();
+    let mut config = ProjectConfig::load(root).map_err(|e| e.to_string())?;
+    config.session = session;
+    config.save(root).map_err(|e| e.to_string())
+}
+
 /// Return the user's keybinding overrides from the global config.
 ///
 /// Map keys are action names in snake_case (e.g. `"tab_next"`); values are

src-tauri/src/config/mod.rs

@@ -10,7 +10,7 @@ mod global;
 mod project;
 
 pub use global::GlobalConfig;
-pub use project::ProjectConfig;
+pub use project::{PdfTabEntry, PdfTabState, ProjectConfig, SessionConfig};
 
 use std::collections::HashMap;
 
@@ -104,8 +104,8 @@ pub struct MergedConfig {
     pub appearance: AppearanceConfig,
     pub layout: LayoutConfig,
     pub keybindings: KeybindingsConfig,
-    /// Reference IDs of tabs that should be restored on launch.
-    pub open_tabs: Vec<String>,
+    /// Tabs that should be restored on launch.
+    pub open_tabs: Vec<PdfTabEntry>,
 }
 
 impl MergedConfig {
@@ -157,7 +157,7 @@ pub enum ConfigError {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::config::project::SessionConfig;
+    use crate::config::project::{PdfTabEntry, SessionConfig};
 
     // ── AppearanceConfig ──────────────────────────────────────────────────────
 
@@ -201,6 +201,7 @@ mod tests {
         let original = LayoutConfig {
             left_pane_fraction: 0.25,
             right_pane_fraction: 0.40,
+            ..LayoutConfig::default()
         };
         let s = toml::to_string_pretty(&original).unwrap();
         let parsed: LayoutConfig = toml::from_str(&s).unwrap();
@@ -272,12 +273,18 @@ mod tests {
         let global = GlobalConfig::default();
         let project = ProjectConfig {
             session: SessionConfig {
-                open_tabs: vec!["tab-a".to_string(), "tab-b".to_string()],
+                open_tabs: vec![
+                    PdfTabEntry { ref_id: "tab-a".to_string(), title: "a2024".to_string() },
+                    PdfTabEntry { ref_id: "tab-b".to_string(), title: "b2024".to_string() },
+                ],
+                ..Default::default()
             },
             ..Default::default()
         };
         let merged = MergedConfig::merge(&global, Some(&project));
-        assert_eq!(merged.open_tabs, ["tab-a", "tab-b"]);
+        assert_eq!(merged.open_tabs.len(), 2);
+        assert_eq!(merged.open_tabs[0].ref_id, "tab-a");
+        assert_eq!(merged.open_tabs[1].ref_id, "tab-b");
     }
 
     #[test]
@@ -286,6 +293,7 @@ mod tests {
             layout: LayoutConfig {
                 left_pane_fraction: 0.30,
                 right_pane_fraction: 0.40,
+                ..LayoutConfig::default()
             },
             ..Default::default()
         };

src-tauri/src/config/project.rs

@@ -1,16 +1,37 @@
 //! Per-project configuration.
 
+use std::collections::HashMap;
 use std::path::{Path, PathBuf};
 
 use serde::{Deserialize, Serialize};
 
 use super::{AppearanceOverride, ConfigError};
 
-/// Reference IDs of tabs to restore when the project is next opened.
+/// Persisted zoom and scroll state for a single PDF tab.
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize, Default)]
+#[serde(default)]
+pub struct PdfTabState {
+    pub zoom: f64,
+    pub scroll_top: f64,
+}
+
+/// A PDF tab to restore on next launch.
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize, Default)]
+pub struct PdfTabEntry {
+    pub ref_id: String,
+    pub title: String,
+}
+
+/// Session state restored when a project is next opened.
 #[derive(Debug, Clone, PartialEq, Serialize, Deserialize, Default)]
 #[serde(default)]
 pub struct SessionConfig {
-    pub open_tabs: Vec<String>,
+    /// PDF tabs to reopen, in order (Library tab is implicit).
+    pub open_tabs: Vec<PdfTabEntry>,
+    /// Index into [Library, ...open_tabs] of the tab that was active.
+    pub active_tab: usize,
+    /// Per-reference zoom and scroll position, keyed by ref_id.
+    pub pdf_states: HashMap<String, PdfTabState>,
 }
 
 /// Per-project configuration, stored at `{repo}/.brittle/config.toml`.
@@ -77,6 +98,8 @@ mod tests {
         let cfg = ProjectConfig::default();
         assert!(cfg.appearance.is_none());
         assert!(cfg.session.open_tabs.is_empty());
+        assert_eq!(cfg.session.active_tab, 0);
+        assert!(cfg.session.pdf_states.is_empty());
     }
 
     #[test]
@@ -87,7 +110,13 @@ mod tests {
                 font_size: Some(16),
             }),
             session: SessionConfig {
-                open_tabs: vec!["abc-123".to_string()],
+                open_tabs: vec![PdfTabEntry {
+                    ref_id: "abc-123".to_string(),
+                    title: "smith2024".to_string(),
+                }],
+                active_tab: 1,
+                pdf_states: [("abc-123".to_string(), PdfTabState { zoom: 1.5, scroll_top: 320.0 })]
+                    .into_iter().collect(),
             },
         };
         let s = toml::to_string_pretty(&cfg).unwrap();
@@ -130,7 +159,8 @@ mod tests {
                 font_size: None,
             }),
             session: SessionConfig {
-                open_tabs: vec!["ref-1".to_string()],
+                open_tabs: vec![PdfTabEntry { ref_id: "ref-1".to_string(), title: "ref2024".to_string() }],
+                ..Default::default()
             },
         };
         original.save_to(&path).unwrap();
@@ -146,7 +176,8 @@ mod tests {
 
         let original = ProjectConfig {
             session: SessionConfig {
-                open_tabs: vec!["x".to_string()],
+                open_tabs: vec![PdfTabEntry { ref_id: "x".to_string(), title: "x2024".to_string() }],
+                ..Default::default()
             },
             ..Default::default()
         };

src-tauri/src/lib.rs

@@ -32,6 +32,8 @@ pub fn run() {
             commands::config::get_keybindings,
             commands::config::get_layout_config,
             commands::config::get_last_project,
+            commands::config::get_session,
+            commands::config::save_session,
             // repository
             commands::repository::create_repository,
             commands::repository::open_repository,

src-tauri/src/pdf_protocol.rs

@@ -26,6 +26,14 @@ static PDFJS_WORKER_JS: &[u8] = include_bytes!(
     "../assets/viewer/pdfjs/pdf.worker.min.js"
 );
 
+// Viewer JS bundles (served at brittle://app/viewer/<file>)
+// Source: src-tauri/assets/viewer-src/src/ — build with:
+//   cd src-tauri/assets/viewer-src && npm run build
+static VIEWER_BUNDLE_JS: &[u8] =
+    include_bytes!("../assets/viewer/viewer.bundle.js");
+static RENDER_WORKER_BUNDLE_JS: &[u8] =
+    include_bytes!("../assets/viewer/render-worker.bundle.js");
+
 // ── Public API ────────────────────────────────────────────────────────────────
 
 /// Entry point registered with `tauri::Builder::register_uri_scheme_protocol`.
@@ -37,6 +45,7 @@ pub fn handle<R: Runtime>(app: &AppHandle<R>, req: &Request<Vec<u8>>) -> Respons
 
     match routing::classify(uri.path(), uri.query()) {
         routing::Route::Viewer { ref_id } => serve_viewer(&ref_id),
+        routing::Route::ViewerAsset { file_name } => serve_viewer_asset(&file_name),
         routing::Route::PdfjsAsset { rel_path } => {
             if rel_path.contains("..") {
                 return response_403();
@@ -57,6 +66,15 @@ fn serve_viewer(_ref_id: &str) -> Response<Vec<u8>> {
     response_ok(VIEWER_HTML.to_vec(), "text/html; charset=utf-8")
 }
 
+fn serve_viewer_asset(file_name: &str) -> Response<Vec<u8>> {
+    let bytes: &[u8] = match file_name {
+        "viewer.bundle.js"        => VIEWER_BUNDLE_JS,
+        "render-worker.bundle.js" => RENDER_WORKER_BUNDLE_JS,
+        _                         => return response_404(),
+    };
+    response_ok(bytes.to_vec(), "application/javascript; charset=utf-8")
+}
+
 fn serve_pdfjs_file(rel_path: &str) -> Response<Vec<u8>> {
     let bytes: &[u8] = match rel_path {
         "build/pdf.min.js"        => PDFJS_MIN_JS,
@@ -152,17 +170,31 @@ pub mod routing {
     #[derive(Debug, PartialEq)]
     pub enum Route {
         Viewer { ref_id: String },
+        ViewerAsset { file_name: String },
         PdfjsAsset { rel_path: String },
         Pdf { ref_id: String },
         NotFound,
     }
 
     /// Classify a `brittle://app/{path}?{query}` request into a `Route`.
+    ///
+    /// - `/viewer`          (no further path segments) → HTML shell
+    /// - `/viewer/<file>`   (one path segment)         → viewer JS module
+    /// - `/pdfjs/<rel>`                                → PDF.js asset
+    /// - `/pdf`                                        → raw PDF bytes
     pub fn classify(path: &str, query: Option<&str>) -> Route {
         let ref_id = extract_ref_id(query);
 
         if path == "/viewer" {
             Route::Viewer { ref_id }
+        } else if let Some(rest) = path.strip_prefix("/viewer/") {
+            // Reject any path that contains directory separators or dots
+            // at the start, to prevent traversal.
+            if rest.contains('/') || rest.starts_with('.') {
+                Route::NotFound
+            } else {
+                Route::ViewerAsset { file_name: rest.to_owned() }
+            }
         } else if let Some(rel) = path.strip_prefix("/pdfjs/") {
             Route::PdfjsAsset {
                 rel_path: rel.to_owned(),
@@ -239,6 +271,30 @@ pub mod routing {
             );
         }
 
+        #[test]
+        fn viewer_asset_route() {
+            let r = classify("/viewer/viewer.js", None);
+            assert_eq!(r, Route::ViewerAsset { file_name: "viewer.js".into() });
+        }
+
+        #[test]
+        fn viewer_asset_route_bundles() {
+            for name in &["viewer.bundle.js", "render-worker.bundle.js"] {
+                let path = format!("/viewer/{}", name);
+                assert_eq!(
+                    classify(&path, None),
+                    Route::ViewerAsset { file_name: name.to_string() }
+                );
+            }
+        }
+
+        #[test]
+        fn viewer_asset_traversal_blocked() {
+            // Directory traversal via nested path → NotFound
+            assert_eq!(classify("/viewer/../secret.js", None), Route::NotFound);
+            assert_eq!(classify("/viewer/sub/file.js", None), Route::NotFound);
+        }
+
         #[test]
         fn unknown_paths_are_not_found() {
             assert_eq!(classify("/unknown", None), Route::NotFound);

src-tauri/tauri.conf.json

@@ -5,12 +5,12 @@
   "identifier": "dev.brittle.app",
   "build": {
     "beforeDevCommand": {
-      "script": "trunk serve",
-      "cwd": "../brittle-ui"
+      "script": "sh scripts/dev.sh",
+      "cwd": ".."
     },
     "beforeBuildCommand": {
-      "script": "trunk build --release",
-      "cwd": "../brittle-ui"
+      "script": "npm --prefix src-tauri/assets/viewer-src run build && trunk build --release",
+      "cwd": ".."
     },
     "devUrl": "http://localhost:1420",
     "frontendDist": "../dist"