Add file watcher integration and IDE enhancements

- Implement file system watching with watchdog for real-time file panel updates
- Add FileEventMessage for event-driven file change handling
- Integrate Claude events parsing for IDE awareness of Claude actions
- Add extension hooks for file changes (clide_on_file_changed, clide_on_file_saved)
- Enhance editor pane with syntax highlighting service
- Improve workspace panel with action bar and file operations
- Update Claude panel with PTY terminal integration
- Add TODO.md to track long-term project items
- Update keybindings to use Alt-based shortcuts

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

TODO.md

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+# TODO
+
+Long-term open items for Clide development.
+
+## Core Features
+
+### Claude Integration
+- [ ] Streaming markdown responses in Claude panel
+- [ ] Visual distinction between Claude responses, tool calls, and user input
+- [ ] Claude history browser (past conversations)
+- [ ] Claude diff flow (propose changes → diff tab → accept/reject)
+
+### Editor
+- [ ] Multi-file tab support with state preservation
+- [ ] Cursor position and scroll position persistence
+- [ ] Undo/redo history preservation when hiding panel
+- [ ] Find in file (`Ctrl+F`)
+- [ ] Go to line (`Ctrl+G`)
+
+### Diff Panel
+- [ ] Side-by-side diff view
+- [ ] Unified diff view toggle
+- [ ] Accept/Reject buttons for Claude-proposed changes
+- [ ] Syntax highlighting in diff content
+
+### Terminal
+- [ ] Full PTY integration for terminal emulation
+- [ ] Command history preservation
+- [ ] Output buffer retention when hiding
+
+### Git Integration
+- [ ] Stage/unstage files from Git tab
+- [ ] Discard changes context menu
+- [ ] Git graph visualization (Tree tab)
+- [ ] Branch popout with checkout/new branch actions
+
+## Context Panel (Right Sidebar)
+
+### Problems View
+- [ ] Linter integration (ruff, eslint, etc.)
+- [ ] Click to navigate to file:line
+- [ ] Reactive problem count badge
+
+### TODOs View
+- [ ] Scan for TODO/FIXME/HACK/XXX comments
+- [ ] Click to navigate to file:line
+- [ ] Reactive count badge
+
+### Jira View
+- [ ] Render Jira CLI markdown output
+- [ ] Auto-refresh on panel focus
+- [ ] Configurable refresh interval
+
+## UI/UX
+
+### Responsiveness
+- [ ] CSS breakpoints for different terminal widths
+- [ ] Auto-hide sidebars on narrow terminals (<100 cols)
+- [ ] Compact mode toggle (`Alt+C`)
+
+### Fullscreen Mode
+- [ ] Any panel can go fullscreen (`F11`)
+- [ ] Exit fullscreen with `Escape`
+
+### Command Palette
+- [ ] Implement command palette (`Alt+P`)
+- [ ] Quick open file (`Alt+O`)
+
+## State Management
+
+### Session Persistence
+- [ ] Remember open files across sessions
+- [ ] Persist panel sizes and layout
+- [ ] Save last git state
+- [ ] Remember expanded/collapsed sections
+
+### Multiple Projects
+- [ ] Workspace switcher
+- [ ] Recent projects list
+
+## Plugin System
+
+- [ ] User-defined panels via pluggy
+- [ ] Custom integrations support
+- [ ] Extension API documentation
+
+## Testing
+
+- [ ] Snapshot tests for all panels
+- [ ] Integration tests for panel communication
+- [ ] Unit tests for controllers
+- [ ] Unit tests for services
+
+## Documentation
+
+- [ ] User guide
+- [ ] Plugin development guide
+- [ ] Architecture documentation updates
+
+## Build & Distribution
+
+- [ ] PyInstaller builds for macOS
+- [ ] PyInstaller builds for Linux
+- [ ] CI/CD pipeline with Gitea Actions