- Add a shared SSE event buffer utility and wire it into planning, subtask, mission interview, and task stream routes
- Support Last-Event-ID replay semantics and robust event serialization so clients can recover missed stream events
- Add a resilient client-side reconnect wrapper and surface reconnecting state in planning, subtask breakdown, and mission interview modals
- Expand test coverage across API routes, SSE buffering behavior, reconnect handling, and mission/planning stream flows
- Replace size selection buttons (S/M/L) with a clean dropdown in subtask breakdown dialog
- Increase description textarea height for better editing experience
- Clean up orphaned CSS from removed size button styles
- Fix fragile size selection test to use proper dropdown interaction
- 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
- Handle empty error messages in subtask-breakdown session by falling back to 'Unknown error'
- Fix backend SSE routes to coerce error data to string and handle missing message
- Improve frontend connectSubtaskStream to validate parsed error data before displaying
- Add tests for error display in SubtaskBreakdownModal component
- Change default task prefix from KB to FN across all packages
- Rename branch naming pattern from kb/{id} to fusion/{id}
- Update all test assertions and fixtures to use new prefixes
- Add changeset for the breaking change
- Resolve merge conflicts in TaskCard.test.tsx touch gesture tests
- Add backend subtask breakdown session management and API endpoints
- Create SubtaskBreakdownModal component for generating AI-suggested subtasks
- Integrate subtask breakdown into QuickEntryBox and NewTaskModal flows
- Add frontend API client functions for breakdown sessions and subtask creation
- Add tests for SubtaskBreakdownModal and backend routes
- Create changeset documenting the subtask breakdown feature
