Fix SW navigation handler and update toast trigger

- Use redirect:manual in the navigation fetch so cross-origin auth
  redirects (e.g. Cloudflare Access session expiry) are passed through
  to the browser instead of silently serving stale cached HTML
- Fix GrampsjsUpdateAvailable: the parent's click listener could not be
  removed (bind() produces a new reference), causing any click on the
  snackbar to trigger skipWaiting; override _postMessage to ignore clicks

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/components/GrampsjsUpdateAvailable.js

@@ -6,9 +6,15 @@ import '@material/mwc-button'
 export class GrampsjsUpdateAvailable extends PwaUpdateAvailable {
   async connectedCallback() {
     super.connectedCallback()
-    this.removeEventListener('click', this._postMessage.bind(this))
     this.addEventListener('update:reload', this._postMessage.bind(this))
   }
+
+  // The parent attaches a click listener via .bind(), so it can't be removed (new
+  // reference each time). Ignore clicks; only 'update:reload' should trigger an update.
+  _postMessage(e) {
+    if (e?.type === 'click') return
+    super._postMessage(e)
+  }
 }
 
 window.customElements.define(

src/sw.js

@@ -1,4 +1,4 @@
-import {precacheAndRoute, createHandlerBoundToURL} from 'workbox-precaching'
+import {precacheAndRoute, matchPrecache} from 'workbox-precaching'
 import {registerRoute, NavigationRoute} from 'workbox-routing'
 import {CacheFirst} from 'workbox-strategies'
 import {CacheableResponsePlugin} from 'workbox-cacheable-response'
@@ -12,18 +12,28 @@ self.addEventListener('message', event => {
 
 precacheAndRoute(self.__WB_MANIFEST)
 
-// Handle navigation requests (SPA routing) by serving the precached index.html,
-// except for API routes which should always go to the network.
+// Try the network first with redirect:manual so cross-origin auth redirects
+// (e.g. Cloudflare Access) are passed through to the browser. Falls back to
+// precached index.html for SPA routing and offline use.
 registerRoute(
-  new NavigationRoute(createHandlerBoundToURL('index.html'), {
-    denylist: [/^\/api.*/],
-  })
+  new NavigationRoute(
+    async ({request}) => {
+      try {
+        const response = await fetch(request, {redirect: 'manual'})
+        if (response.type === 'opaqueredirect') {
+          return response
+        }
+      } catch {
+        // offline
+      }
+      return matchPrecache('/index.html')
+    },
+    {denylist: [/^\/api.*/]}
+  )
 )
 
-// Cache thumbnails with a stable cache key:
-// - strip `jwt` so token rotation doesn't bust the cache
-// - keep `checksum` in the cache key for content-addressed invalidation
-// - strip `checksum` before the network request so the backend doesn't reject it
+// Cache thumbnails: strip `jwt` from cache key (token rotation), strip `checksum`
+// before fetching (backend rejects it; kept in cache key for invalidation).
 const thumbnailPlugin = {
   cacheKeyWillBeUsed: async ({request}) => {
     const url = new URL(request.url)