feat(frontend): setup frontend foundation

- Install dependencies: date-fns, @vite-pwa/sveltekit, workbox-window
- Configure Vite with PWA support and manifest
- Update SvelteKit config for static adapter with fallback
- Create environment files (.env, .env.example, .env.production)
- Create directory structure for lib, components, routes
- Add JSDoc type definitions for Task, User, AuthTokens, etc.
- Add utility functions: storage (localStorage wrapper), uuid, dates, sync-queue
- Configure PWA with icons, theme colors, and caching strategies

opal-web/svelte.config.js

@@ -1,6 +1,19 @@
 import adapter from '@sveltejs/adapter-static';
 
 /** @type {import('@sveltejs/kit').Config} */
-const config = { kit: { adapter: adapter() } };
+const config = {
+	kit: {
+		adapter: adapter({
+			pages: 'build',
+			assets: 'build',
+			fallback: 'index.html',
+			precompress: false,
+			strict: true
+		}),
+		paths: {
+			base: ''
+		}
+	}
+};
 
 export default config;