Add export/import functionality for session replay:
**Export Features:**
- Export as shareable link (base64 encoded events in URL parameter)
- Export as .fabric-replay file (JSON format)
- Share button in replay controls with dropdown menu
**Import Features:**
- Import from .fabric-replay file via file picker
- Import from URL parameter (?replay=base64EncodedEvents)
- Automatic detection and loading of replay data from URL
**Implementation:**
- src/utils/replayExport.ts: Core export/import utilities for Node.js
- src/web/frontend/src/utils/replayExport.ts: Browser-specific utilities
- Updated web SessionReplay.tsx with export dropdown and status messages
- Updated TUI SessionReplay.ts with exportToFile/importFromFile methods
- Added session replay panel to App.tsx with URL parameter support
- Added CSS styles for export dropdown, status messages, and replay panel
**Export Format:**
```json
{
"version": "1.0",
"exportedAt": 1709337600,
"eventCount": 150,
"events": [...],
"metadata": {
"sessionStart": 1709337000,
"sessionEnd": 1709337600,
"workerCount": 3
}
}
```
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
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