fix: version and bypass app-shell worker during native boot

public/push-sw.js

@@ -10,7 +10,7 @@
  * navigations are network-first with an index fallback. No API, DM or model
  * request is ever stored; only same-origin static bytes.
  */
-const SHELL_CACHE = 'skate-spots-shell-v2';
+const SHELL_CACHE = 'skate-spots-shell-v3';
 const SHELL_ASSETS = ['/', '/index.html'];
 
 self.addEventListener('install', (event) => {
@@ -39,6 +39,12 @@ self.addEventListener('fetch', (event) => {
   const url = new URL(request.url);
   if (url.origin !== self.location.origin) return;
   if (url.pathname.startsWith('/api/') || url.pathname.startsWith('/.netlify/')) return;
+  // Never cache the boot guard: an old cached copy must not be able to trap
+  // the app in its own stale-worker cleanup path.
+  if (url.pathname === '/boot-guard.js') {
+    event.respondWith(fetch(request).catch(() => caches.match(request).then((cached) => cached || Response.error())));
+    return;
+  }
 
   if (request.mode === 'navigate') {
     event.respondWith(

src/lib/appServiceWorker.ts

@@ -29,7 +29,7 @@ export function registerAppServiceWorker(): void {
   started = true;
 
   const register = () => {
-    navigator.serviceWorker.register('/push-sw.js').catch(() => {
+    navigator.serviceWorker.register('/push-sw.js', { updateViaCache: 'none' }).catch(() => {
       // Private mode / unsupported browser — the app works without it.
     });
   };