Address PR #162 review must-fixes:
- CHANGELOG: add an [Unreleased] > Fixed bullet for #161 (New chat during
the first turn's stream now resets the thread; a late refetch/onFinish
from the abandoned thread no longer pulls the user back in).
- Re-anchor the stale startNewChat/cancelPendingAdoption test to selectChat:
startNewChat now calls startFreshThread, but cancelPendingAdoption still
backs selectChat, so the disarm guard is decoupled and kept valid.
- Add a test pinning that startFreshThread() disarms the armed error-path
fallback (the justification for dropping cancelPendingAdoption from
startNewChat).
- Add a ChatThread render test (mocked useChat) asserting the onError branch
forwards onTurnFinished(undefined, threadKey).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
8f9d7fe0bd