* Add unit test for ChatViewModel.refreshSettings
This commit adds a missing test case for the `refreshSettings` function in `ChatViewModel.kt`. The new test verifies that the UI state correctly updates to reflect changes in `AuthManager` properties such as `typingEffectEnabled` and `typingEffectDelayMs`. This resolves the testing gap and ensures safer refactoring for settings management in the future.
* test(#506): strengthen refreshSettings test to prove live re-read + drop test_plan.md
Re-stub AuthManager after construction and assert the state delta, so the
test actually catches a regression where refreshSettings() would cache the
init-time value instead of re-reading AuthManager live. Removes the one-off
Jules planning artifact from the repo root.
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