feedback5 CB5: the boss round's prep shows both players of a pair together — the partner's pieces on the other half, as the battle places them — and frames the pair's two avatars in the official green (community report of 2026-10-06, item 51)

The own half was already the official one (the right-hand player on the right half with the
right_boss_*_camera_param camera, its layout mirrored col c -> 20 - c with RIGHT <-> LEFT, so its operators
face the leader as before: research 09 §1.2, DESIGN §15); the partner's half stood empty and nothing framed
the pair.
Server: in a boss round's prep m.private.bossMate { playerId, side, units } = the partner's board as UnitInfo
on its half (Match.bossMateView, finalAssault.js bossFieldPlacement); markPrivate marks the partner's
m.private with the mover's, so it follows live; a scout of either player (Match.prepFieldMeta) carries both
halves (`mate`), and its signature covers the partner's board.
Client: render/app.js syncMates draws the partner's units read-only ('m:<uid>' views: never picked, dragged
or swept with the own pieces) and the whole boss field is lit; the team panel frames the pair's avatars
(gameLogic teamFrameIds: the players still in by seat, two by two, as prepCamera — the boss field in the
fight) from the round start through the Final Assault / Hidden Core, with the official ui/battle
bg_team_border tinted the autochess green (#4ed8af; a plain ring without the local art); none for a lone
player, an eliminated player, a spectator seat, or 联防.
Overlap with PR #191 (same-field frames, issue #190; not merged): it published m.public bossPairing and
framed the partner alone in gold, 联防 included, plus a banner naming the partner; here the pairing is read
as the prep camera already does, both avatars get the official green frame, boss rounds only.
[ASSUMED] the partner's bench is not shown; one frame per avatar.

Golden unchanged. Tests: test/match/feedback5-boss-pair-prep.test.js (new, 4), the item 55 test now checks
the scouted player's own pieces (the partner's stand on the other half); SP_E2E
test/ui/feedback5-boss-pair.e2e.test.js (new, 2: both halves and the frames in prep and fight; item 55's
eliminated guest on the boss field with the leader). Docs: design/client.md §10 / §15, design/network.md,
PLAYING.md.

public/js/ui/teamPanel.js

@@ -1,6 +1,7 @@
 // Left team panel (research 06 §11.1, research 09 §3.1): one row per seat — avatar (band icon once picked), name, LP
 // tower, status glyph (… acting / ✓ ready / ⌛ deciding / ⚔ combat / door left / ✕ dead), AI badge, "you" marker, the
-// field being watched (eye badge), and emote bubbles.
+// field being watched (eye badge), and emote bubbles. In a boss round the viewer's pair is framed in green from the
+// round's start (gameLogic teamFrameIds; community report of 2026-10-06, item 51).
 // Observing (client-side combat, `observe` prop — the official flow): tapping a teammate's avatar expands a mint
 // "前往查看" button under the row (when that teammate can be observed now; otherwise the reason is toasted through
 // onWatch); while observing, the own row shows a "返回战场" button. Without `observe` (server-run combat) a click
@@ -19,7 +20,7 @@ import { PHASE } from '../../../shared/constants.js';
 import { html, Icon, Tooltip } from './components.js';
 import { PlayerAvatar, LpTower, GIcon, LocalSprite } from './gameComponents.js';
 import { EmoteBubble } from './emotes.js';
-import { STATUS_META, sortedPlayers } from './gameLogic.js';
+import { STATUS_META, sortedPlayers, teamFrameIds } from './gameLogic.js';
 import { MissTag, uniteRemaining } from './hud.js';
 import { localAsset } from '../data.js';
 import { t } from '../../../shared/i18n.js';
@@ -79,6 +80,10 @@ export function TeamPanel({ pub, myId, watching, bubbles, onWatch, compact = fal
   useEffect(() => { setOpenPid(null); }, [phaseKey, watching, observe?.observing]);
   const players = sortedPlayers(pub);
   if (!players.length) return null;
+  // a boss round: the viewer's pair framed in green from the round's start (item 51 — the official bg_team_border,
+  // tinted like the official green; a plain green ring without the local art)
+  const team = teamFrameIds(pub, myId);
+  const frameArt = team.size ? localAsset('ui/battle', 'bg_team_border') : null;
   const click = (p, self) => {
     if (!observe) { onWatch(p); return; }
     if (self) { if (observe.observing) observe.onBack(); setOpenPid(null); return; }
@@ -98,9 +103,11 @@ export function TeamPanel({ pub, myId, watching, bubbles, onWatch, compact = fal
       const back = !!observe && self && observe.observing;
       const title = observe ? (self ? (observe.observing ? t('返回战场') : t('你自己')) : t('查看 {name} 的战场', { name: p.name })) : (self ? t('查看自己的阵地') : t('查看 {name} 的阵地', { name: p.name }));
       const lp = rowLp(p, pub, self ? selfLive : null, { uniteLocal, cap });
-      return html`<div key=${p.playerId} class=${cx('team__row', self && 'is-self', watched && 'is-watched', p.alive === false && 'is-dead', open && 'is-open')}>
-        <button type="button" class="team__btn" onClick=${() => click(p, self)} title=${title} aria-expanded=${observe && !self ? String(open) : undefined}>
+      const inTeam = team.has(p.playerId);
+      return html`<div key=${p.playerId} class=${cx('team__row', self && 'is-self', inTeam && 'is-team', watched && 'is-watched', p.alive === false && 'is-dead', open && 'is-open')}>
+        <button type="button" class="team__btn" onClick=${() => click(p, self)} title=${inTeam && !self ? `${title} · ${t('与你在同一战场')}` : title} aria-expanded=${observe && !self ? String(open) : undefined}>
           <${PlayerAvatar} player=${p} self=${self} />
+          ${inTeam ? html`<span class=${cx('team__frame', !frameArt && 'team__frame--plain')} style=${frameArt ? `--frame:url("${frameArt}")` : undefined} aria-hidden="true"></span>` : null}
           <span class="team__seat num">P${(p.seat ?? 0) + 1}</span>
           ${p.isBot ? html`<span class="team__ai">AI</span>` : null}
           ${self ? html`<span class="team__you"><${Icon} name="user" /></span>` : null}