feat: implement QoL features (toast notifications, command palette, auto-save)

Add three major quality-of-life features to improve user experience:

Toast Notification System:
- Non-blocking notifications for all major actions
- Four variants: success, error, warning, info
- Auto-dismiss with progress bar
- Bottom-right positioning with smooth animations
- Replaced old status messages throughout the app

Command Palette (Ctrl+P):
- Keyboard-driven quick access to all actions
- 14 built-in commands across 5 categories
- Real-time fuzzy search with arrow key navigation
- Shows keyboard shortcuts for each command
- Grouped by category with visual feedback

Auto-save & Recovery:
- Automatic draft saving (1s debounce)
- Per-character draft storage in localStorage
- Auto-recovery on app restart or character switch
- Draft age display (e.g., "2 hours ago")
- Auto-cleanup of drafts older than 7 days
- Clears draft when message is sent

Updated README with new Ctrl+P keyboard shortcut
Updated ROADMAP with Phase 8: Quality of Life & Polish section

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

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

README.md

@@ -62,6 +62,7 @@ Config stored in `~/.config/claudia/config.json`
 - **Left/Right Arrow** - Navigate between response alternatives
 - **Escape** - Close panels/modals, cancel editing
 - **Ctrl+K** - Focus message input
+- **Ctrl+P** - Open command palette (quick access to all actions)
 - **Ctrl+/** - Toggle Roleplay Tools panel
 
 ## Roadmap