Add PDF state persistence

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();