Add comprehensive auto-save functionality to prevent data loss.
Features:
- Auto-save every 30 seconds
- Saves all layers with canvas data
- Preserves layer masks
- Saves layer properties (visibility, opacity, blend mode, etc.)
- Toast notification on restore
- Utility functions for managing auto-save:
* hasAutoSave() - Check if auto-save exists
* loadAutoSave() - Restore from auto-save
* clearAutoSave() - Clear saved data
* getAutoSaveTime() - Get save timestamp
- Converts canvas to data URLs for storage
- Restores canvas from data URLs
- Handles errors gracefully
Changes:
- Created hooks/use-auto-save.ts
- useAutoSave() hook for periodic saving
- Saves project structure to localStorage
- Auto-save key: 'paint-ui-autosave'
- 30-second save interval
- Includes timestamp for restore info
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Sebastian Krüger
5a20e12ea4