- BUG-1: Prevent double-tap by locking phase before async submit
- BUG-2: Submit timeout notification to server when timer expires
- BUG-3: Distinct "TIME'S UP!" visual vs "ANSWER SUBMITTED"
- BUG-4: Track consecutive poll failures, show connection lost banner
- BUG-5: Add A-D / 1-4 keyboard shortcuts for MC choices
- BUG-6: Use choice text as v-for key instead of array index
- BUG-7: Deadline-based timer (250ms tick) prevents drift
- BUG-8: Validate choice is in current choices before submit
- BUG-9: Submit empty timeout instead of random choice on expiry
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
