feat: implement entire game flow — rounds, scoring, host/skip/leave/restart

[asifEverest]

Summary

Implements the full multiplayer drawing game flow across multiple phases, plus a final bug fix for host-disconnect popup on exit.

Features

• Room Setup & Lobby — Create/join rooms, polling-based participant sync, host-only game start
• Game Start & Drawer Flow — Transition to playing state, drawer assignment, canvas drawing with strokes
• Round Advancement & Scoring — Guess submission with correct/incorrect feedback, round progression, persistent round-result overlay with Continue/Restart/Exit Game buttons
• Host Disconnect Detection — 30s inactivity threshold, hostDisconnected flag, "Claim Host" popup for non-host players
• Drawer Disconnect & Skip Round — Drawer inactivity detection, "Notify Host" → badge on host's Skip Round button, host can skip the round
• Game Over on Player Exit — removeParticipant() service, DELETE /:code/leave route, "finished" room status, persistent result card with Exit-only view
• Name Validation — 20-char max enforced via Zod schema and frontend maxLength

Bug Fixes

• Host-disconnected popup on exit — When the host (last active player) exits after other participants disconnected, removeParticipant now ends the game (status → "finished") instead of reassigning host to a stale participant, preventing the false "Host Disconnected" popup. Added room.status !== "finished" guard to HostDisconnectedBanner in LobbyPage for defense-in-depth.
• Notify Host dismisses banner — Locally patch drawerDisconnected: false after suggestSkip() API call succeeds

Contributor

• Email: asif.mansoori@everest.engineering
• Role:
  • Product
  • Developer