feedback3 WE: spectator seats in the browser — 观战 in the lobby, the 观战席 strip in the room (host removes, 入座), watch-only match screen; docs (community report #26)

docs/DESIGN.md

@@ -412,6 +412,8 @@ S→C: `welcome {playerId, token, name, serverNow}` · `room.state {code, hostId
 
 Platform additions (implemented): `welcome.{resumed, version}`, `room.state.inMatch`, `error.detail`; `room.closed.reason ∈ 'timeout'|'shutdown'`; WebSocket close codes 4001 (session taken over by another socket — client must not auto-reconnect), 4002 (no hello in time), 1008 (flooding), 1001 (shutdown). The host's `room.start` counts as the host being ready. After any (re)`hello` the server pushes `room.state` and, if a match runs, the match resends `m.public`/`m.private` (+`m.field`, or the field's `b.start` under client-side combat). **Reconnect window:** a dropped session stays resumable for 10 min (`net.js NET_DEFAULTS.reconnectWindowMs`; co-op seats keep playing their last lineup meanwhile, §6.6); a session that drops while its **solo** room's match runs stays resumable for the official `config.constants.singleReconnectTime` (86 400 s = 24 h; lobby option `soloReconnectWindowMs`; research 01 §1 "24小时内随时返回") — the untimed solo run simply waits. Only when the window expires does the drop become `match.onLeave` (co-op: 中途退出 = elimination; solo: the run ends `'abandoned'`). The client keeps its token in sessionStorage plus a recent-token list in localStorage, so reopening the tab resumes. Everything lives in server memory: a server restart ends every room and run. The lobby⇄match interface (constructor opts, `start/handle/onDisconnect/onReconnect/onLeave/dispose`) is documented verbatim at the top of `server/match/Match.js` and is normative. `server/data.js` provides `getData()` + index getters (`getChess`, `getBond`, `getGarrison`, `getItem`, `getBand`, `getEffect`, `getEnemy`, `getWave`, `getStage`, `getBoss`, `getToken`, `getConfig`, `getMode`). Note: the skill trigger rule lives at `chess.skill.trigger.rule` in data.
 
+**Spectator seats** (a remake feature — the official room has none; community report #26, owner's decision 2026-10-04; the spectator-seat subsection of §23): `room.spectate {code}` takes one of a co-op room's `MAX_SPECTATORS` (2) spectator seats, in its lobby or during its match; `room.removeSpectator {playerId}` (host) frees one (`room.closed {reason:'kicked'}` to it); `room.state.spectators: [{playerId, name, connected}]`. A spectator is never a player (not in `seats`, not counted for the start, never host, keeps no room alive — `room.closed {empty}` when the last human leaves), receives the room's broadcasts and watches like an eliminated player (`Match.addSpectator`: `b.start` watch / `m.field`, never `m.private`); it may only `g.watch`, leave, and store a `room.loadout` — anything else answers `error SPECTATOR`. Its seat is kept and given back on reconnect like a player's.
+
 ### 8.2 Match
 C→S (all carry `rid`): `g.infoReady` · `g.band {bandId}` · `g.bandSkip` · `g.bandFocus {bandId?}` (the strategy highlighted in the draft screen — what a timed-out turn takes; absent / null clears it; `WRONG_PHASE` outside BAND_DRAFT, `ALREADY` after the pick, `BAD_TARGET` for a band not allowed; §18.2) · `g.buy {slot}` · `g.refresh` · `g.freeze` · `g.levelUp` · `g.sell {uid}` · `g.move {uid, to:{area:'board', row, col}|{area:'hand', idx}, dir?}` · `g.equip {itemUid, targetUid, replaceUid?}` (`replaceUid`: which equipped item a third one replaces, §6.2) · `g.art {itemUid, row, col, dir?}` (`dir` ∈ UP|RIGHT|DOWN|LEFT from the deploy wheel, §3; absent ⇒ `to.dir`, then RIGHT; `g.move` onto the piece's own tile re-orients it; board pieces in `m.private` / `m.field {prep:true}` carry `dir`) · `g.destroy {uid}` (hand / temp items only; equipped items are locked, §6.2) · `g.reward {idx}` · `g.choice {idx}` · `g.ready {ready}` · `g.emote {id}` · `g.watch {fieldId}` · `g.autoplay {on}` · `g.pause {on}` (solo battles only, §14 Solo pause) · `g.unitStats {seq?}` (ROUND_START / SP_DRAFT / PREP, else `WRONG_PHASE`; eliminated: `ELIMINATED`) → push `m.unitStats` (§18.5) · `g.leave`
 S→C: