fix: PWA improvements — clean up SW, fix chin bar, add shortcuts, improve mobile support

- Remove dead precache manifest from SW (no fetch handler to consume it)
- Set empty globPatterns in vite-plugin-pwa config
- Fix bottom chin bar padding: use scaled safe-area token instead of raw inset
- Add 'New Session' PWA shortcut (client + server manifest)
- Add PWA meta tags to mobile.html (manifest, Apple icons, theme-color)
- Fix static site.webmanifest: add id/scope, correct description
- Remove duplicate apple-mobile-web-app-title from index.html
- Move SW registration to module scope (earlier, no window.load delay)
- Update manifest route tests for new shortcut order

packages/web/server/lib/opencode/pwa-manifest-routes.js

@@ -237,6 +237,13 @@ export const registerPwaManifestRoute = (app, dependencies) => {
         { src: '/favicon-16.png', sizes: '16x16', type: 'image/png' },
       ],
       shortcuts: [
+        {
+          name: 'New Session',
+          short_name: 'New',
+          description: 'Start a new coding session',
+          url: '/',
+          icons: [{ src: '/pwa-192.png', sizes: '192x192', type: 'image/png' }],
+        },
         {
           name: 'Appearance Settings',
           short_name: 'Settings',

packages/web/server/lib/opencode/pwa-manifest-routes.test.js

@@ -65,6 +65,13 @@ describe('PWA manifest route', () => {
       const manifest = JSON.parse(res.body);
       expect(fetchCalls).toHaveLength(2);
       expect(manifest.shortcuts).toEqual([
+        {
+          name: 'New Session',
+          short_name: 'New',
+          description: 'Start a new coding session',
+          url: '/',
+          icons: [{ src: '/pwa-192.png', sizes: '192x192', type: 'image/png' }],
+        },
         {
           name: 'Appearance Settings',
           short_name: 'Settings',