Add ability to edit built-in presets (Default, Roleplay, Creative Writing,
Assistant) while preserving original defaults:
- Built-in presets are now fully editable (system additions, author's note,
instruction blocks)
- Modifications are saved as overrides in ~/.config/claudia/presets/
- "Modified" badge appears when built-in preset has been customized
- "Restore to Default" button removes overrides and restores originals
- Backend commands: is_builtin_preset_modified, restore_builtin_preset
- All instruction blocks support expand/collapse and drag-and-drop reordering
Also update ROADMAP.md to reflect completed features:
- World Info/Lorebook System ✅
- Author's Note ✅
- User Personas ✅
- Regex Scripts ✅
- Chat History Import/Export ✅🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>