186fa81b08
API Routes: - GET /api/worksheets/settings?type=addition - Load user's saved config - POST /api/worksheets/settings - Save current config (upsert) - Uses parseAdditionConfig() for validation and migration - Returns defaults if no saved settings exist UI Integration: - Load saved settings on mount (preserves derived state) - Auto-save settings 1 second after changes (debounced) - Only save after initial load completes (prevents overwriting on mount) - Exclude transient fields (date, seed, rows, total) from persistence - Show "Saving settings..." and "✓ Settings saved at HH:MM:SS" indicator User Experience: - Settings persist across sessions automatically - New seed generated on each page load (fresh problems) - Date field always starts empty (filled at generation time) - Derived state (rows, total) recalculated from primary state Technical Details: - Type-safe with Zod validation - Automatic schema migration (v1 → v2 when we add fields) - Graceful fallback to defaults on errors - 1s debounce prevents excessive saves during rapid changes 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>