Service worker caching strategy

Precache the shell, JS, CSS and self-hosted fonts in
mealquest-precache-v1. Route every other request through the pure
src/sw/routes.ts decision: NetworkFirst (3 s timeout) for plans,
shopping, dinners and home; CacheFirst with expiration for /media/* and
font files; NetworkOnly for /auth/*, settings, jobs and every non-GET.
App navigations fall back to the precached index.html offline. On
activate, delete only stale caches named mealquest-*.

Maestro task: 8fa0d0bd-4a52-4f09-ba68-41bdbdfda63b

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

web/vite.config.ts

@@ -17,6 +17,8 @@ export default defineConfig({
       srcDir: 'src',
       filename: 'sw.ts',
       injectRegister: 'script',
+      // Precache the shell, JS, CSS and the self-hosted fonts.
+      injectManifest: { globPatterns: ['**/*.{html,js,css,woff2}'] },
       // The web manifest lives in manifest.json: its theme and background
       // colours are --color-accent and --color-bg from src/styles/tokens.css,
       // and hex colours may not be written in TypeScript.