Race condition: on page remount, selectChat(oldId) loads session data async.
If the user clicks New Chat before the API returns, the old session's
pending_task_lane was being applied to the new session's state, showing
stale tasks and blocking new ones from appearing.
Fix: currentChatRef tracks the most recently requested chat ID synchronously.
All chat-creation paths (selectChat, handleNewChat, handleResumeNew) update it
immediately. After each await in selectChat, bail if the ref no longer matches.
Also documents the pattern as Lesson 106 in CLAUDE.md for future reference.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
VITE_SENTRY_DSN is already set in Railway as a build arg. The hardcoded
fallback was unnecessary and triggered GitHub secret scanning alerts.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>