Playtest #4 fixes: tile picking, knocked-down state, element gauges, draft timer, live stats, shop items, drones, 赫默, 炎佑, UI flash

- #1 picking by the tile under the pointer (prep, battle, pen, equipment drops); the dragged model stays
  under the pointer (mouse and touch); pixel probe removed; phone ghost-click on the underframe fixed
- #2 two-tap confirm on 机变 cards (like the shop)
- #3 a 同盟 room with one human is untimed like 独立模拟 (no countdown outside battles)
- #4 strategy draft: one synced countdown, 30 s per human turn, timeout takes the highlighted band
- #5 special 维式重锤 (4) and 突变细胞 no longer sold; item card shows where they come from
- #6 operator skill-mode sounds no longer play on normal attacks (纯烬艾雅法拉 and 55 others)
- #7 detail card shows live battle stats and the prep-time battle-start stats (g.unitStats)
- #8 official element gauges on units; burst cooldown (阻回) per PRTS
- #9 knocked-down operators stay on their tile with a redeploy countdown ring
- #10 drone behaviour per PRTS (暴鸰, 先兆者 shells, 黑云, 萨科塔之眼)
- #11 赫默's drone only from her skill; placeable summons limited to talent tokens
- #12 炎佑 stays where it is with no enemies; 祛恶之焰 as a continuous channel
- #13 the occasional giant bond icon (loading texture scaled ×46) fixed
- docs (DESIGN §18), recordings, data and tests updated (2467 unit tests, all browser suites green)

docs/META.md

@@ -31,7 +31,7 @@ server/match/
 ## 1. Match flow
 
 ```
-LOBBY → INFO_CHECK (co-op 25 s, solo untimed; all humans confirmed ⇒ next) → BAND_DRAFT → BATTLE_CHECK (3 s)
+LOBBY → INFO_CHECK (co-op 25 s; solo and single-human matches untimed; all humans confirmed ⇒ next) → BAND_DRAFT → BATTLE_CHECK (3 s)
 → for r = 1..lastRound (+ hidden):
      ROUND_START (2 s)  income + pending coins, upgrade price −1 (r > 1, floor 0), temp NOT wiped (what overflowed after
                         the last prep's deadline — battle-result grants, a SETTLE merge's elite, returned equipment — is
@@ -40,7 +40,7 @@ LOBBY → INFO_CHECK (co-op 25 s, solo untimed; all humans confirmed ⇒ next)
                         shop reroll (frozen slots kept in place, then unfrozen), the round's wave generated (preview),
                         onRoundStart dispatch
      [SP_DRAFT]         r ∈ modes[m].spRounds (机变)
-     PREP               onPrepStart; co-op timer rounds[r].prepTime, solo untimed; ends when every alive seat is ready
+     PREP               onPrepStart; co-op timer rounds[r].prepTime, solo / single human untimed; ends when every alive seat is ready
      (prep end)         onPrepEnd, the temp pieces due at this prep resolved (tempDue; what arrived after Ready or
                         during onPrepEnd waits for the next prep), reward offers expire, unfrozen shop cleared, funds lost
                         (band_cannot keeps them), boss round: Σ activated layers recorded for the hidden-core check
@@ -54,28 +54,37 @@ LOBBY → INFO_CHECK (co-op 25 s, solo untimed; all humans confirmed ⇒ next)
 | Timer (real s, × `opts.timerScale`) | Value |
 |---|---|
 | INFO_CHECK | `config.timers.infoCheck` 25 |
-| band draft turn / whole step | `bandTurn` 12 / `bandDraft` 50 (co-op; solo untimed) |
+| band draft turn | `Match.BAND_TURN_SECONDS` 30 [ASSUMED] (= `timers.bandTurn`), the step's only countdown: `m.public.deadline` = the current turn's end, no step cap (`timers.bandDraft` 50 = the official whole step, informational) (co-op; solo / single human untimed) |
 | BATTLE_CHECK | `battleCheck` 3 |
-| 机变 first / other pickers | `spFirst` 30 / `spTurn` 16 (co-op; solo untimed) |
-| PREP | `modes[m].rounds[r].prepTime` (co-op; solo untimed) |
+| 机变 first / other pickers | `spFirst` 30 / `spTurn` 16 (co-op; solo / single human untimed) |
+| PREP | `modes[m].rounds[r].prepTime` (co-op; solo / single human untimed) |
 | COMBAT / 联防 | `modes[m].rounds[r].combatTimeLimit` (= the level's `maxPlayTime`) real seconds = 2× that in game seconds |
 | 最终攻势 / 隐秘核心 | no hard stop: countdown `rounds[r].levelMaxPlayTime` 120 real s; overtime drain from `bossOvertimeAfter` 150 real s, 1 team LP per real s (§3) |
 | ROUND_START / after combat / SETTLE | 2 / 1.5 / 3 (presentation delays, `Match.DELAYS`) |
 | bot action delay | 0.9 s (+0.35 s per seat) |
 
+A match with a single human seat at the start (独立模拟, or a 同盟 room started alone / with AI teammates only:
+`Match.loneHuman` → `Match.soloUntimed`, user playtest #4 item 3) times nothing outside its battles: no INFO_CHECK /
+band draft / 机变 / PREP deadline, and BATTLE_CHECK / ROUND_START / SETTLE run silently (deadline 0); the co-op rules
+(draft order and skip, 6 机变 cards, 联防) stay.
 `m.public.deadline` is the absolute end of the current timer (ms epoch, 0 = untimed; combat: estimated end at 2×;
 最终攻势 / 隐秘核心: the boss level's `levelMaxPlayTime` countdown, 120 real s — the battle goes on past it — with
 `m.public.overtimeAt` = when the overtime drain starts, 150 real s; both on the field clock).
 
 ### 1.1 Band draft
-Co-op: random order (all seats, bots included), one pick per turn, 12 s per turn (timeout ⇒ `bandDraft.timeoutBandId`
-华法琳), 50 s cap for the whole step (every unpicked seat gets 华法琳), one skip per player (`g.bandSkip`: the player moves to
-the end of the order; refused when nobody is left to pass to), duplicates allowed, band must list the mode type in
-`modeTypeList`. Solo: free pick, no timer, no skip. Starting LP = `bands[id].totalHp`.
+Co-op: random order (all seats, bots included), one pick per turn, ONE countdown: `BAND_TURN_SECONDS` 30 s per turn,
+published as `m.public.deadline` (= `draft.turnDeadline`; `draft.turnSeconds` its length) — no step cap; AI seats pick
+at once. A turn that runs out takes the strategy the player highlights in the draft screen (`g.bandFocus {bandId?}`,
+`Match.timeoutBand`) while it is allowed and no teammate holds it, else `bandDraft.timeoutBandId` 华法琳, else the first
+free strategy by sortId (`defaultBand`; a departing seat gets `defaultBand` too). One skip per player (`g.bandSkip`: the
+player moves to the end of the order; refused when nobody is left to pass to); a strategy a teammate already took is
+refused (队友已选); band must list the mode type in `modeTypeList`. A single human (co-op with AI teammates only):
+untimed. Solo: free pick, no timer, no skip. Starting LP = `bands[id].totalHp`.
 
 ### 1.2 机变 (SP draft)
 Family = weighted pick from `choices.schedule[modeId].rounds[r].families`; cards: co-op 6 shared (each player takes 1,
-random order, 30 s first / 16 s others, timeout ⇒ a random remaining card), solo 3 untimed. A 驰援 tactic card
+random order, 30 s first / 16 s others, timeout ⇒ a random remaining card), solo 3; solo and single-human drafts are
+untimed. The UI picks a card with two taps (select → 确认选择, DESIGN §18.2). A 驰援 tactic card
 (`single_special_choice_gain_bond_chess`) is only offered while its bond still has chess in this match's pool
 (`Match.bondInPool`; a bond whose every member is banned would grant nothing); more generally a 驰援 or 盟誓
 (`global_special_choice_bond_addlayer`) card is offered only while one of its bonds is live (`Match.bondLive`: not in
@@ -197,7 +206,7 @@ Every handler method is `(ctx, ev)`; `ev` is shared by all handlers of one dispa
 | `onMerge` | chess or item merge | `{ kind, piece, baseId|itemId, consumed:[uid] }` |
 | `onLevelUp` | shop level up | `{ level, price }` |
 | `onSpend` | a payment's action is complete (buy / refresh / levelUp / reward / effect) | `{ amount, reason, total }` (`total` = funds spent this match) |
-| `onBattleStart` | a battle input is built (normal / unite / boss / hidden) | `{ input: PlayerBattleInput, kind, round }` — mutate/replace `ev.input` |
+| `onBattleStart` | a battle input is built (normal / unite / boss / hidden); also for the stats preview (`g.unitStats`, DESIGN §18.5) | `{ input: PlayerBattleInput, kind, round, spawns?, preview? }` — mutate/replace `ev.input`. With `ev.preview` true (no `ev.spawns`) a handler must NOT change match state or draw match rng: the preview only reads the input |
 | `onBattleResult` | SETTLE (normal rounds) and after boss fields | `{ result, lpLoss, perfect, unite?|boss? }` |
 | `onChoicePick` | a 机变 card was applied (the card's own `choice:` handler runs first, then every source observes) | `{ card, family, picker, forTeammate }` |
 | `onEquip` | `g.equip` (item handler only) | `{ item, target, golden, consumed, keep, error }` — see §2.5 |
@@ -429,7 +438,7 @@ who sent in its parent, ≤ the parents' data offspring count (磨砻 2, 烹泉
 drawn set; `disabledBonds` = drawn ∪ the mode's static list), `hiddenBossId`, `bossRound`, `hiddenRound`, `spRound`,
 `combatMode` (`'client'` | `'server'`), `fields[].progress { killed, total, done }` (teammates' progress UI), `paused`
 (solo pause, §1.3a),
-`players[].autoplay`, and per phase: `draft { order, turn, picks, skipsLeft, turnDeadline, untimed }` (BAND_DRAFT),
+`players[].autoplay`, and per phase: `draft { order, turn, picks, skipsLeft, turnDeadline, turnSeconds, untimed }` (BAND_DRAFT),
 `sp { family, name, desc, eventId, cards:[{ idx, kind:'bounty'|'item'|'tactic', id, name, desc, tier, coin?, payout?,
 rounds?, enemyKey?, count?, price?, team?, tacticKind? }], order, turn, picks:{pid: idx}, taken:{idx: pid}, untimed }`
 (SP_DRAFT), `teamLp` / `bossHp {hp,max}` (Final Assault on), `overtimeAt` (最终攻势 / 隐秘核心: ms epoch when the