Feature/pomodoro

[TexasOct]

• refactor: remove unused configuration keys and adjust capture interval

• Remove unused 'processing.screenshot_interval' (replaced by monitoring.capture_interval)
• Remove unused 'image_optimization.max_images_per_event' (replaced by processing.max_screenshots_per_extraction)
• Clean up code references in settings.py and models/responses.py
• Adjust default capture interval from 0.2s to 1.0s

• feat(pomodoro): implement Pomodoro timer with idle/active mode strategy

Add Pomodoro timer feature that controls perception layer (screenshot/keyboard/mouse capture) based on work sessions. Implements an idle-by-default strategy where perception only runs during active Pomodoro sessions.

Core Changes:

• Add PomodoroManager to handle session lifecycle and coordinate with perception layer
• Implement session database storage (pomodoro_sessions, raw_records tables)
• Create API handlers for starting/stopping Pomodoro sessions
• Add migration system with initial schemas and Pomodoro feature migration

Perception Layer:

• Remove _pomodoro_mode flag from ScreenshotCapture (Pomodoro only controls start/stop)
• Fix screenshot capture blocking issue by removing run_in_executor
• Simplify screenshot loop to call capture() directly in async context
• Improve timing accuracy by compensating for execution time in sleep

Architecture:

• Idle Mode (default): Perception layer stopped, zero resource usage
• Active Mode (Pomodoro): Perception layer running, captures activity data
• Session data persisted to database for deferred batch processing
• SessionAgent paused during Pomodoro, resumes after for activity aggregation

Frontend:

• Add PomodoroTimer component with start/stop controls
• Create pomodoro Zustand store for state management
• Add Tauri event handlers for Pomodoro processing events
• Add i18n translations for Pomodoro UI

Documentation:

• Update .project.md with Pomodoro mode principles and design rules
• Document that Pomodoro has no system configuration parameters
• Clarify that capture behavior (smart capture, deduplication) is not affected by Pomodoro mode

Technical Notes:

• macOS Core Graphics requires screenshot capture in main event loop context
• Thread pool execution causes 30s blocking on sct.grab() - resolved by direct async calls
• Loop timing controlled by asyncio.sleep() with execution time compensation

• feat(pomodoro): implement event emitters for processing progress

Add dedicated Tauri event emitters for Pomodoro processing:

• emit_pomodoro_processing_progress: Progress updates
• emit_pomodoro_processing_complete: Completion notifications
• emit_pomodoro_processing_failed: Error notifications

Resolves all TODOs in pomodoro_manager.py by integrating with the existing event system infrastructure.