Fix react-pacer import and initialize diff state in test

- update `useDebouncedValue` import to `@tanstack/react-pacer`
- add missing `diffThreadId`, `diffTurnId`, and `diffFilePath` in thread continuity test state
f07b6ac8e6Julius Marminge committed on 2/19/2026, 5:59:17 AM· committed by Julius Marmingeparent3afbf93
2 files changedLine totals unavailable