- Add planning model selection UI to PlanningModeModal initial view with model loading, favorites wiring, and default/custom badge state
- Extend startPlanningStreaming client API to send optional planningModelProvider/planningModelId overrides
- Propagate planning model overrides through /planning/start-streaming and createSessionWithAgent so agent creation uses selected model settings
- Add frontend and backend tests covering modal selection behavior, request forwarding, and end-to-end planning model flow
- Add modalPersistence hook for saving/restoring modal state (description, goal) via localStorage
- Update PlanningModeModal to persist and restore description across re-opens
- Update SubtaskBreakdownModal to persist and clear description on resume flow
- Update MissionInterviewModal to clear goal after starting interview
- Add unit tests for modalPersistence hook
- Add integration tests for modal re-entry behavior across all three modals
- Add changeset for published package patch bump
