- Fix mobile refresh button icon visibility in SystemStatsModal
- Add auto-refresh activity indicator with spinning refresh state
- Update modal styles for responsive refresh controls and animation states
- Expand SystemStatsModal tests to cover mobile visibility and auto-refresh indicator behavior
- Add dashboard API endpoint and server route to terminate Vitest worker processes safely
- Extend legacy API client with killVitestProcess support for frontend invocation
- Add SystemStatsModal UI controls and styling for triggering Vitest kill actions, including mobile width stability fixes
- Expand route and modal tests to cover new controls and behavior
- Add changeset and architecture docs updates for the new Vitest kill capability
