Story phase 3: the act card, the ceremony with its loot, the act's end

Three animated screens in the storyboard's look, built in the page over
a paused world:
- The act title card: the act's court pans in behind ACT n, its league,
  its court and its goal; it closes itself after three seconds or on a
  tap.
- The cup's ceremony: YOU CLEARED THE COURT, the rounds and the run's
  xp, then the act's weapons drop into a rack one by one ("…and gained
  these for the hordes to come"), and the chapter preview with the
  mid-boss named and game 10 still "???" until the transformation.
- The act card: what the act cost (bodies, bosses, deaths), what it
  opened in the arcade, and the next act's court; CONTINUE goes straight
  on, THE CLUBHOUSE goes home.

The checkpoint keeps its in-game banner. Headless, every screen falls
back to the plain card it replaced. v381, staging only.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/config.js

@@ -1027,15 +1027,16 @@ export const cupFixture = (lg, champion = 0) => {
 //   boss    BOSS_ART index of the game-10 boss (the cup finalist, grown)
 //   pool    weapons this act ADDS to the rack; the stock is every pool up to and including the act
 //   double  the act's stock and restock pay two tins of each (league 5's double tins)
+//   arcade  the arcade doors clearing this act opens (MODES ids, plus 'vs' for hosting a friend)
 // The chapter plays the arcade's games base+1..base+10 (base = (act-1)*20), so every director curve
 // that reads G.runGames — spawn ramps, barrel gaps, machines, racket hp — keeps its tuned slope.
 export const STORY = {
   acts: [
-    { lg: 1, rounds: [1, 2, 3, 4],    mid: 8, boss: 0, pool: ['bomb', 'triple', 'fire'] },
-    { lg: 2, rounds: [5, 6, 8, 7],    mid: 6, boss: 5, pool: ['gun', 'beacon'] },
-    { lg: 3, rounds: [9, 10, 11, 12], mid: 1, boss: 2, pool: ['laser'] },
-    { lg: 4, rounds: [13, 15, 14],    mid: 4, boss: 3, pool: ['flamer', 'rocket'] },
-    { lg: 5, rounds: [16, 17, 18],    mid: 7, boss: 9, pool: [], double: true },
+    { lg: 1, rounds: [1, 2, 3, 4],    mid: 8, boss: 0, pool: ['bomb', 'triple', 'fire'], arcade: ['train', 'classic'] },
+    { lg: 2, rounds: [5, 6, 8, 7],    mid: 6, boss: 5, pool: ['gun', 'beacon'],          arcade: ['zombie'] },
+    { lg: 3, rounds: [9, 10, 11, 12], mid: 1, boss: 2, pool: ['laser'],                  arcade: ['gore'] },
+    { lg: 4, rounds: [13, 15, 14],    mid: 4, boss: 3, pool: ['flamer', 'rocket'],       arcade: ['vs'] },
+    { lg: 5, rounds: [16, 17, 18],    mid: 7, boss: 9, pool: [], double: true,           arcade: [] },
   ],
   midAt: 5,          // the mid-boss walks on after this many chapter games (and is the checkpoint)
   length: 10,        // games in a chapter; the act's boss walks on after the last