[cvburgess]

Summary

• HabitRing stops its animations on unmount. Its two Animated.timing calls were never stopped, so a ring unmounted mid-fill kept scheduling rAF frames. In Jest this caused the "environment has been torn down" ReferenceError from HabitTracker.test.tsx on every run, because the future-day case unmounts within the 300ms animation.
• useNotes / useLists mutation tests now end on settleQueries. Before, they ended on a mock's call count, so react-query's late notifications landed in the next test. That's the CI flake in useNotes › rolls back the optimistic note…. Stress results: useNotes failed 1 in 24 parallel runs before and 0 in 48 after.
• Dropped --forceExit. jest.setup.js now installs a react-query timeoutManager provider that unref()s its timers, so the un-cleared QueryClient gc timers (5 min) no longer hold workers open. They still fire; they just don't block exit. This removes the "worker process has failed to exit gracefully" warning, and from now on that warning means a real leak.
  • The provider shifted timing enough to expose the same call-count anti-pattern in useLists (6 failures in 32 runs), which is fixed here too (0 in 48).

Closes DEX-241

Documentation updates

• docs/testing.md: replaced the "npm test needs --forceExit" bullet, now obsolete, with "don't add it back" and where the gc timers are handled.

Test plan

• npm test run 25 times in a row: no failures, no torn-down / worker-exit / act() output, and Jest exits on its own
• --detectOpenHandles reports nothing
• npm run typecheck, npm run lint, npm run format:check pass
• CI green
• Habit rings still animate fill and completion on device

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