0.2.3: prepare follow-up fixes and client features (#407, #408, #410, #413, #431, #435, #436, #440, #444)

Add special-target activation without bypassing attack cadence, cooperative
card preferences and emotes, skill sound banks, per-operator voice choices,
text sizing, install prompts, closed-tab recovery and unanimous setup rerolls.
Retain late deployment elapsed time and resolve echo/counter pulses without
recursive hook overflow. Independent final review remains pending.

Golden: roster-016, roster-035, roster-036, roster-045;
boss-boss_1-pair, boss-boss_3-pair, boss-boss_5-pair, boss-boss_7-pair,
hidden-boss_9-pair; solo-HARD-9-boosted: Lemuen attack cadence.
diy-132: Necras extra activation targets.
coop2-NORMAL-14-standins: cooperative purchase preference and simulation fixes.
hidden-boss_10-solo: echo pulse FIFO resolution.
See DESIGN 28.13-28.24 for assumptions, sources and contributor credit.

test/render/assets.test.js

@@ -50,7 +50,7 @@ const M = {
   audio: {
     bgm: { prep: { loop: '/bgm/prep.mp3' }, lobby: { intro: '/bgm/i.mp3', loop: '/bgm/l.mp3' } },
     bossBgm: { boss_1: { loop: '/bgm/b1.mp3' } },
-    sfx: { ui: { buy: '/sfx/buy.mp3' }, battle: { deploy: '/sfx/dep.mp3' }, units: { char_010_chen: { attack: '/sfx/c_atk.mp3', skills: { 2: '/sfx/c_s3.mp3' }, skill: '/sfx/c_s.mp3' } } },
+    sfx: { ui: { buy: '/sfx/buy.mp3' }, battle: { deploy: '/sfx/dep.mp3' }, units: { char_010_chen: { attack: '/sfx/c_atk.mp3', hit: '/sfx/c_hit.mp3', skills: { 2: '/sfx/c_s3.mp3' }, skill: '/sfx/c_s.mp3', attacks: { 2: '/sfx/c_atk_s3.mp3' }, hits: { 2: '/sfx/c_hit_s3.mp3' } } } },
   },
 };
 
@@ -134,6 +134,12 @@ describe('URL helpers (synthetic manifest)', () => {
     assert.equal(unitSfxUrl(M, 'char_010_chen', 'skill', 2), '/sfx/c_s3.mp3');
     assert.equal(unitSfxUrl(M, 'char_010_chen', 'skill', 0), '/sfx/c_s.mp3');
     assert.equal(unitSfxUrl(M, 'char_010_chen_2', 'attack'), '/sfx/c_atk.mp3');
+    // the running skill's own attack sound (sfx.units[id].attacks, tools/assets/audio.mjs pickModeAttacks)
+    assert.equal(unitSfxUrl(M, 'char_010_chen', 'attack', 2), '/sfx/c_atk_s3.mp3');
+    assert.equal(unitSfxUrl(M, 'char_010_chen', 'attack', 0), '/sfx/c_atk.mp3', 'no attacks[0] ⇒ the normal bank');
+    assert.equal(unitSfxUrl(M, 'char_010_chen', 'hit', 2), '/sfx/c_hit_s3.mp3', 'the running skill\'s own impact');
+    assert.equal(unitSfxUrl(M, 'char_010_chen', 'hit', 1), '/sfx/c_hit.mp3', 'no hits[1] ⇒ the normal impact');
+    assert.equal(unitSfxUrl(M, 'char_010_chen', 'die', 2), null, 'only an attack / an impact has a per-skill file');
     assert.equal(unitSfxUrl(M, 'nobody', 'attack'), null);
   });
 });