Fix PWA install hint dismiss after cached HTML/JS mismatch.

Restore button id, bind dismiss at document level, force hide inline, and fetch pwa.js/style.css network-first.

Co-authored-by: Cursor <cursoragent@cursor.com>

static/sw.js

@@ -1,4 +1,4 @@
-const CACHE = "if-viewer-static-v5";
+const CACHE = "if-viewer-static-v6";
 const ASSETS = [
   "/static/style.css",
   "/static/favicon.svg",
@@ -10,6 +10,11 @@ const ASSETS = [
   "/static/locales/de.json",
 ];
 
+const NETWORK_FIRST = new Set([
+  "/static/pwa.js",
+  "/static/style.css",
+]);
+
 self.addEventListener("install", (event) => {
   event.waitUntil(
     caches.open(CACHE)
@@ -33,6 +38,21 @@ self.addEventListener("fetch", (event) => {
   if (url.pathname.includes("/api/")) return;
   if (!url.pathname.startsWith("/static/")) return;
 
+  if (NETWORK_FIRST.has(url.pathname)) {
+    event.respondWith(
+      fetch(event.request)
+        .then((response) => {
+          if (response.ok) {
+            const copy = response.clone();
+            caches.open(CACHE).then((cache) => cache.put(event.request, copy));
+          }
+          return response;
+        })
+        .catch(() => caches.match(event.request))
+    );
+    return;
+  }
+
   event.respondWith(
     caches.match(event.request).then((cached) => cached || fetch(event.request))
   );