Feature: Auto-refresh and manual refresh for comments with real-time updates

## Feature Request

Implement automatic polling for comment updates and provide a manual refresh option to ensure users always see the latest comments.

## Description

Comments should automatically poll for updates at regular intervals, and users should have the ability to manually refresh comments on demand to see the latest changes immediately.

## Proposed Implementation

### Automatic Polling
- Poll for new comments at configurable intervals (default: 30 seconds)
- Smart polling that adjusts frequency based on activity
- Pause polling when tab/window is inactive
- Resume polling when user returns
- WebSocket support for real-time updates (if available)
- Efficient delta updates (only fetch new/modified comments)

### Manual Refresh Options
- Prominent refresh button on comments page
- Pull-to-refresh on mobile devices
- Keyboard shortcut (e.g., Cmd/Ctrl + R for comments area)
- Refresh indicator showing last update time
- Loading state during refresh
- Success/error feedback after refresh

### Update Indicators
- Visual cue for new comments since last view
- Badge count for unread comments
- Highlight newly added comments temporarily
- "New" label on recent comments
- Notification toast for incoming comments
- Scroll to new comments option

## Configuration Options

- User-configurable polling interval
- Enable/disable auto-refresh
- Notification preferences for new comments
- Choose between polling vs WebSocket
- Bandwidth-saving mode (longer intervals)
- Quiet hours (disable polling during specific times)

## Performance Considerations

- Incremental updates (fetch only changes)
- Debounce rapid refresh requests
- Cache management for comment data
- Optimistic UI updates
- Background sync when possible
- Rate limiting protection

## UI/UX Features

- "Last updated X minutes ago" timestamp
- Spinning refresh icon during update
- Smooth animations for new comments
- Preserve scroll position during updates
- Option to auto-scroll to new comments
- Connection status indicator
- Offline mode with queue for pending comments

## Error Handling

- Retry logic for failed polls
- Exponential backoff for errors
- User notification for connection issues
- Graceful fallback to manual refresh
- Conflict resolution for concurrent edits

## Benefits

- Real-time collaboration experience
- Never miss important feedback
- Reduced manual refresh actions
- Better team synchronization
- Improved review workflow

## Acceptance Criteria

- [ ] Comments automatically poll for updates
- [ ] Polling interval is configurable
- [ ] Manual refresh button is available and functional
- [ ] New comments are visually indicated
- [ ] Last update timestamp is displayed
- [ ] Polling pauses when inactive
- [ ] Performance remains optimal with frequent updates
- [ ] Error states are handled gracefully
- [ ] User preferences are persisted
- [ ] Mobile pull-to-refresh works
- [ ] WebSocket fallback to polling works seamlessly

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

The issue names no files, tests, or entry points. Start by locating the comments page and its existing comment-fetching flow, then establish the scope for polling, manual refresh, indicators, preferences, mobile behavior, and WebSocket fallback. Done means the listed acceptance criteria are implemented and verified, including graceful error handling and preserved performance.

Written by the indexing model from the issue text.