New features:
- Error notifications: AI provider errors (rate limits, auth failures, network issues) now show visible notifications
- Xiaomi MiMo models: MiMo V2.5 Pro, MiMo V2.5, and MiMo V2 Flash added to the free model tier
- Grammar correction "Dismiss": Permanently hide specific corrections
- Grammar "Add to Dictionary": Add words to a personal dictionary so they're never flagged as spelling errors

Bug fixes:
- Streaming autocomplete stability: Fixed incorrect this context in partial completion handler that would crash
- Persistent grammar preferences: Dismissed corrections and dictionary words survive browser restarts
- YouTube adapter consistency: Parameter naming standardized across all platform adapters