feat(ui): add PWA support with vite-plugin-pwa

- Add vite.config.pwa.ts extending the base config with VitePWA plugin
- Generate PWA icons at build time from source logo via @vite-pwa/assets-generator
- Add web app manifest with name, theme color, display overrides
- Add Workbox runtime caching: NetworkFirst for API, CacheFirst for assets
- Set navigateFallback to null to preserve server-side auth redirects
- Server build uses build:pwa for PWA-enabled output; Electron/Tauri use
  the base build without PWA

Signed-off-by: Jesper Derehag <jderehag@hotmail.com>

packages/ui/package.json

@@ -7,6 +7,7 @@
   "scripts": {
     "dev": "vite dev",
     "build": "vite build",
+    "build:pwa": "vite build -c vite.config.pwa.ts",
     "preview": "vite preview",
     "typecheck": "tsc --noEmit -p tsconfig.json"
   },
@@ -30,11 +31,13 @@
     "solid-toast": "^0.5.0"
   },
   "devDependencies": {
+    "@vite-pwa/assets-generator": "^1.0.2",
     "autoprefixer": "10.4.21",
     "postcss": "8.5.6",
     "tailwindcss": "3",
     "typescript": "^5.3.0",
     "vite": "^5.0.0",
+    "vite-plugin-pwa": "^1.2.0",
     "vite-plugin-solid": "^2.10.0"
   }
 }