Version: 1.0 NestJS (legacy)

Features (MVP)

Host: test creation

Host creates a session and adds wines (rounds). Each wine has a name and exactly 4 questions — one per fixed category: color, country, grape variety, vintage year.
For each question the host fills in the correct answer and 3 distractor options (4 choices total).
No minimum wine count is enforced, but a session with zero wines cannot be started.
The session is assigned a randomly generated 4-digit numeric code (e.g. 4821) at creation time. Collisions are resolved by regenerating until a unique code is found.

Controls available to the host during a session:

Control	Behaviour
Start	Opens the session; participants can join via code. Lobby is closed once host starts the first round.
Pause	Freezes the question timer and prevents participants from submitting answers.
Resume	Unfreezes the timer from exactly where it was paused (remaining seconds are preserved).
Reveal Answer	Closes answering for the current question (if timer has not yet expired), highlights the correct option for all participants, and shows per-question score deltas. Host must trigger this manually — it does not fire automatically.
Next	Advances to the next question in the current round, or — after the final question's answer is revealed — shows the round leaderboard and then moves to the next wine. Disabled until the current question's answer has been revealed.
End	Terminates the session immediately from any state. All participants are pushed to the final leaderboard screen.

The host sees a live list of which participants have answered (without revealing their choices) so they know when everyone is done.

Participants join by entering the 4-digit code and are assigned a generated pseudonym (random adjective–wine-noun pair, e.g. TannicFalcon).
Pseudonyms are unique within a session; the app regenerates on collision.
No custom names — generated pseudonyms only.
The lobby rejects joins once 10 players are connected or once the first round has started, whichever comes first.

Host hits Next (or Start for the first question) → question + 4 answer options are broadcast to all participants simultaneously.
Answer options are displayed in the same fixed order for every participant (no per-player shuffling).
Participants tap an option → first tap locks the answer, no changes allowed.
The 60-second timer counts down. When it reaches 0, answering closes automatically (equivalent to the host triggering Reveal Answer, but the host can also trigger it earlier).
Host hits Reveal Answer → correct option is highlighted for everyone; participants who answered correctly see +100 pts.
Host hits Next → moves to the next question, or to the round leaderboard if all 4 questions are done.

Fixed at 60 seconds per question.
Pause freezes the countdown; Resume continues from the frozen value.
Participants who have not answered when the timer expires receive 0 points for that question. No penalty beyond 0.
Late submissions (in-flight at the exact moment the timer hits 0) are accepted if they arrive at the server before the server-side close event is processed.

100 points for a correct answer, 0 for wrong or unanswered — host cannot modify these values.
A per-question score delta is shown to participants immediately after answer reveal.
A round leaderboard (all participants ranked by cumulative score) is shown after all 4 questions of a wine are completed, before the next round begins. The host advances past it with Next.
A final leaderboard is shown to all participants when the host hits End. It persists on-screen until the participant closes the tab.

Participants who disconnect cannot rejoin — their pseudonym and score are retained in the leaderboard but they receive no further questions.
If the host closes the browser tab, the session ends immediately and cannot be resumed. Participants are shown a "session ended" message.
No accounts, no login — minimal friction for quick local games.

Ephemeral only: Zustand/localStorage client-side state. No server-side persistence.
No session export or import for MVP.