Serve PWA icons from fresh /icons/v2/ URLs with every iOS size

iOS showed a letter tile ('N') when adding to the Home Screen. The live files were fine, but a
reverse proxy in front of the app serves static files with a long cache lifetime (live icon.svg
and sw.js were stale) and iOS remembers a failed icon per URL.

- New versioned URLs no proxy/phone has cached; old paths kept for existing installs
- apple-touch-icon declared at 180/167/152/120 (opaque 8-bit RGB PNGs) for app and dashboard
- 180px icon also listed in both manifests; notification icons and root fallbacks use v2
- Service worker cache bumped

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

app/public/sw.js

@@ -4,7 +4,7 @@ self.addEventListener('message', event => {
   if (event.data === 'skipWaiting') self.skipWaiting();
 });
 
-const CACHE = 'weather-v13';
+const CACHE = 'weather-v14';
 
 // App shell cached on install for offline resilience.
 const PRECACHE = [
@@ -18,7 +18,7 @@ const PRECACHE = [
   '/alert-info.js',
   '/app-ui.js',
   '/manifest.json',
-  '/icons/icon.svg'
+  '/icons/v2/icon.svg'
 ];
 
 self.addEventListener('install', event => {
@@ -44,8 +44,8 @@ self.addEventListener('push', event => {
   event.waitUntil(
     self.registration.showNotification(payload.title || 'NeCloud Weather', {
       body: payload.body || '',
-      icon: '/icons/icon-192.png',
-      badge: '/icons/icon-192.png',
+      icon: '/icons/v2/icon-192.png',
+      badge: '/icons/v2/icon-192.png',
       tag: payload.tag || 'weather-alert',
       data: { url: payload.url || '/' },
     })