New Features:
- RemoteAgent: Full server-as-agent mode (bypasses local model)
- DelegationAgent: Local model decides when to ask server for help
- Server mode selector in Settings: Local Only / Full Remote / Smart
- Updated MainViewModel to support all three modes for text, audio, and images
- SettingsUiState and SettingsViewModel updated with serverAgentMode
Modes:
- local_only: Use only local Gemma 4 model (default)
- full_remote: All queries go to delegate server (OpenAI-compatible API)
- delegation: Local model classifies queries, delegates complex ones to server
