feat(app): enhance theme support and improve PWA integration

- Updated the app to support light and dark themes with appropriate CSS classes.
- Enhanced PWA configuration with manifest details and caching strategies.
- Improved the chat UI with dynamic theme adjustments for various components.
- Added new meta tags for better mobile web app experience.
- Refactored environment variables to include new Anthropic token.
- Updated package dependencies for better compatibility and performance.

Made-with: Cursor

.env.example

@@ -5,8 +5,10 @@
 # Get your key at: https://openrouter.ai/keys
 VITE_OPENROUTER_API_KEY=sk-or-your-key-here
 
-# Anthropic Claude (direct API access)
-# Get your key at: https://console.anthropic.com/settings/keys
+# Anthropic Claude — use ONE of these:
+# Option 1: OAuth token from Claude Code CLI (run: claude auth login)
+VITE_ANTHROPIC_TOKEN=sk-ant-oat01-your-token-here
+# Option 2: API key from console (https://console.anthropic.com/settings/keys)
 VITE_ANTHROPIC_API_KEY=sk-ant-your-key-here
 
 # TMDB API (free, for real film poster images)