Add complete frontend interface with Jinja2 templates

- Created base.html template with navigation and flash messages
- Created dashboard.html for video listing sorted by date
- Created channels.html for channel management
- Created add_channel.html with subscription form
- Created watch.html with HTML5 video player
- Created static/style.css with YouTube-inspired dark theme
- Updated main.py with frontend routes:
  - / (index): Dashboard with all videos
  - /channels: Channel management page
  - /add-channel: Add new channel form (GET/POST)
  - /watch/<video_id>: Video player page
- Added new API endpoints:
  - /api/videos/refresh/<channel_id>: Refresh channel videos
  - /api/video/stream/<video_id>: Stream/download video files
- Enhanced /api/download/<video_id> with status checks
- Updated CLAUDE.md with comprehensive frontend documentation

Features:
- Video grid with thumbnails and download status badges
- Inline download buttons for pending videos
- Channel subscription and refresh functionality
- HTML5 video player for downloaded videos
- Auto-refresh during video downloads
- Responsive design for mobile/desktop
- Flash message system for user feedback
- Dark theme with hover effects and animations

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

CLAUDE.md

@@ -111,14 +111,35 @@ python main.py
 # Run the Flask web application
 flask --app main run
 ```
-The web server exposes:
-- `/` - Main page (renders `index.html`)
-- `/api/feed` - API endpoint for fetching feeds and saving to database
-- `/api/channels` - List all tracked channels
-- `/api/history/<channel_id>` - Get video history for a specific channel
+
+## Frontend Interface
+
+The application includes a full-featured web interface built with Jinja2 templates:
+
+**Pages:**
+- `/` - Dashboard showing all videos sorted by date (newest first)
+- `/channels` - Channel management page with refresh functionality
+- `/add-channel` - Form to subscribe to new YouTube channels
+- `/watch/<video_id>` - Video player page for watching downloaded videos
+
+**Features:**
+- Video grid with thumbnails and metadata
+- Real-time download status indicators (pending, downloading, completed, failed)
+- Inline video downloads from dashboard
+- HTML5 video player for streaming downloaded videos
+- Channel subscription and management
+- Refresh individual channels to fetch new videos
+- Responsive design for mobile and desktop
+
+**API Endpoints:**
+- `/api/feed` - Fetch YouTube channel feed and save to database (GET)
+- `/api/channels` - List all tracked channels (GET)
+- `/api/history/<channel_id>` - Get video history for a specific channel (GET)
 - `/api/download/<video_id>` - Trigger video download (POST)
 - `/api/download/status/<video_id>` - Check download status (GET)
 - `/api/download/batch` - Batch download multiple videos (POST)
+- `/api/videos/refresh/<channel_id>` - Refresh videos for a channel (POST)
+- `/api/video/stream/<video_id>` - Stream or download video file (GET)
 
 **API Usage Examples:**
 ```bash
@@ -192,19 +213,59 @@ The codebase follows a clean layered architecture with separation of concerns:
 
 ### Web Server Layer
 **`main.py`** - Flask application and routes
-- `app`: Flask application instance (main.py:10)
-- Database initialization on startup (main.py:16)
-- `index()`: Homepage route handler (main.py:21)
-- `get_feed()`: REST API endpoint (main.py:27) that fetches and saves to DB
-- `get_channels()`: Lists all tracked channels (main.py:60)
-- `get_history()`: Returns video history for a channel (main.py:87)
-- `trigger_download()`: Queue video download task (main.py:134)
-- `get_download_status()`: Check download status (main.py:163)
-- `trigger_batch_download()`: Queue multiple downloads (main.py:193)
-- `main()`: CLI entry point for testing (main.py:251)
 
-### Templates
-**`templates/index.html`** - Frontend HTML (currently static placeholder)
+**Frontend Routes:**
+- `index()`: Dashboard page with all videos sorted by date (main.py:24)
+- `channels_page()`: Channel management page (main.py:40)
+- `add_channel_page()`: Add channel form and subscription handler (main.py:52)
+- `watch_video()`: Video player page (main.py:94)
+
+**API Routes:**
+- `get_feed()`: Fetch YouTube feed and save to database (main.py:110)
+- `get_channels()`: List all tracked channels (main.py:145)
+- `get_history()`: Video history for a channel (main.py:172)
+- `trigger_download()`: Queue video download task (main.py:216)
+- `get_download_status()`: Check download status (main.py:258)
+- `trigger_batch_download()`: Queue multiple downloads (main.py:290)
+- `refresh_channel_videos()`: Refresh videos for a channel (main.py:347)
+- `stream_video()`: Stream or download video file (main.py:391)
+
+### Frontend Templates
+**`templates/base.html`** - Base template with navigation and common layout
+- Navigation bar with logo and menu
+- Flash message display system
+- Common styles and responsive design
+
+**`templates/dashboard.html`** - Main video listing page
+- Video grid sorted by published date (newest first)
+- Thumbnail display with download status badges
+- Inline download buttons for pending videos
+- Empty state for new installations
+
+**`templates/channels.html`** - Channel management interface
+- List of subscribed channels with metadata
+- Refresh button to fetch new videos per channel
+- Link to add new channels
+- Video count and last updated timestamps
+
+**`templates/add_channel.html`** - Channel subscription form
+- Form to input YouTube RSS feed URL
+- Help section with instructions on finding RSS URLs
+- Examples and format guidance
+
+**`templates/watch.html`** - Video player page
+- HTML5 video player for downloaded videos
+- Download status placeholders (downloading, failed, pending)
+- Video metadata (title, channel, publish date)
+- Download button for pending videos
+- Auto-refresh when video is downloading
+
+**`static/style.css`** - Application styles
+- Dark theme inspired by YouTube
+- Responsive grid layout
+- Video card components
+- Form styling
+- Badge and button components
 
 ## Feed Parsing Implementation