Heart sounds: the hurt soul core beats softly, the rival hearts creak, chime and bubble nearby

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

src/main.rs

@@ -2044,6 +2044,7 @@ app.pending_briefing = briefing_of(&campaign, i);
             sounds.play(ev, vec2(app.cam.rx, app.cam.rz), right, hear, now);
         }
         sounds.ambience(&app.game, (app.cam.rx, app.cam.rz), now);
+        sounds.hearts(&app.game, vec2(app.cam.rx, app.cam.rz), right, now);
         // a won mission goes into the campaign progress (with the carry-over); a co-op mission of an
         // editor campaign keeps no progress (its index is not a built-in mission)
         if app.coop_editor {