[WIP] implement notifications for scheduled tasks

[Copilot]

• Analyze current scheduled task implementation
• Examine existing UI handling for scheduled messages
• Run tests to verify current functionality
• Enhance executeTask method with proper notification format
• Add task execution notification indicator in UI
• Add notification system for real-time updates
• Create tests for notification functionality
• Verify notifications work end-to-end

Analysis Complete:
The system already has basic scheduled task functionality with scheduleTask tool and executeTask method. The UI has preliminary support for scheduled messages with clock emoji and special styling. Need to enhance this to provide proper notifications when scheduled tasks execute.

Implementation Plan:

1. Update executeTask to use proper "scheduled message:" format for notifications
2. Enhance UI visual indicators and styling for scheduled task notifications
3. Add real-time notification system for task execution alerts
4. Create comprehensive tests to validate notification functionality

Fixes #7.

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