feat(bangs): add bang counter dashboard widget

Adds a new "bangs" module with a dashboard widget that tracks household
bang events. The widget shows the total count, a configurable recent-bang
list, and an "Add Bang" button that accepts a backdatable date.

On submission, a full celebration sequence fires: screen flash, widget
shake, count pop animation, synthesized firework sound (Web Audio API),
50 full-screen emoji particles via portal, canvas-confetti star bursts,
side cannons, and a timed sequence of 7 firework bursts.

- New bang_events table (migration 0017)
- canvas-confetti dependency for fireworks/confetti effects
- CSS keyframe animations: shake, countPop, emojiFloat
- Fixes pre-existing Drizzle snapshot chain collision (0007/0008)
- Adds OpenPlantBook env vars to compose.yaml

src/app/globals.css

@@ -1346,3 +1346,81 @@ select {
     inset 0 1px 2px rgba(0, 0, 0, 0.12),
     0 0 0 2px rgba(244, 239, 229, 0.08);
 }
+
+/* ─── Bang Counter celebration animations ─────────────────────────────────── */
+@keyframes shake {
+  0%,
+  100% {
+    transform: translateX(0);
+  }
+  10% {
+    transform: translateX(-6px) rotate(-1deg);
+  }
+  20% {
+    transform: translateX(6px) rotate(1deg);
+  }
+  30% {
+    transform: translateX(-5px) rotate(-0.8deg);
+  }
+  40% {
+    transform: translateX(5px) rotate(0.8deg);
+  }
+  50% {
+    transform: translateX(-4px) rotate(-0.5deg);
+  }
+  60% {
+    transform: translateX(4px) rotate(0.5deg);
+  }
+  70% {
+    transform: translateX(-2px);
+  }
+  80% {
+    transform: translateX(2px);
+  }
+  90% {
+    transform: translateX(-1px);
+  }
+}
+
+@keyframes countPop {
+  0% {
+    transform: scale(1);
+  }
+  30% {
+    transform: scale(1.45);
+  }
+  60% {
+    transform: scale(0.9);
+  }
+  80% {
+    transform: scale(1.1);
+  }
+  100% {
+    transform: scale(1);
+  }
+}
+
+@keyframes emojiFloat {
+  0% {
+    transform: translateY(0) scale(1);
+    opacity: 1;
+  }
+  50% {
+    transform: translateY(-60px) scale(1.2);
+    opacity: 0.9;
+  }
+  100% {
+    transform: translateY(-120px) scale(0.7);
+    opacity: 0;
+  }
+}
+
+.animate-shake {
+  animation: shake 0.35s ease-in-out both;
+}
+.animate-count-pop {
+  animation: countPop 0.4s cubic-bezier(0.36, 0.07, 0.19, 0.97) both;
+}
+.animate-emoji-float {
+  animation: emojiFloat 1.8s ease-out both;
+}