Watching a teammate shows their hand, 临时整备区, equipment, strategy and effects (#129)

The prep scout of another player's board carries their 整备区 hand and 临时整备区 as units on the bench rows (like the own prep bench), the equipped items of their operators, their strategy in the drawer and their effects column (the official mode shows a teammate's hand too). The scout signature includes the hand / temp slots, so a moved card refreshes the watcher. Closes #128. Contributed by @2321Robin.

public/js/ui/gameLogic.js

@@ -150,6 +150,13 @@ export function boardTileOf(field, r, c) {
   return [r - BOSS_ROW_SHIFT, field === 'bossR' ? MAX_COL - c : c];
 }
 
+/** The band (策略) a player picked, from m.public.players[].bandId (Match.js marksPublic) — the detail card shows it
+ *   on a teammate's unit (user playtest #2 item 2: watching a teammate revealed nothing about their 策略). */
+export function ownerBandId(pub, ownerId) {
+  const p = Array.isArray(pub?.players) ? pub.players.find((x) => x && x.playerId === ownerId) : null;
+  return typeof p?.bandId === 'string' && p.bandId ? p.bandId : null;
+}
+
 /** Banner shown when a phase starts: { title, sub?, tone } or null. */
 export function phaseBanner(phase, pub) {
   const r = int(pub?.round, 0);