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/modules/bangs/manifest.tsx

@@ -0,0 +1,46 @@
+import { z } from "zod";
+import type { ModuleManifest, WidgetContext } from "../_core/module";
+import { getBangStats } from "./server/queries";
+import { BangWidget } from "./components/bang-widget";
+
+const bangWidgetConfigSchema = z.object({
+  maxRecentBangs: z.number().int().min(1).max(20).default(5),
+});
+
+async function BangWidgetServer({ config, ctx }: { config: unknown; ctx: WidgetContext }) {
+  const parsed = bangWidgetConfigSchema.parse(config);
+  const stats = await getBangStats(ctx.householdId, parsed.maxRecentBangs);
+  return <BangWidget stats={stats} maxRecentBangs={parsed.maxRecentBangs} />;
+}
+
+const bangsManifest: ModuleManifest = {
+  id: "bangs",
+  name: "Bangs",
+  entities: [
+    {
+      type: "bangs.event",
+      label: { singular: "Bang", plural: "Bangs" },
+      resolveUrl: () => "/",
+      renderActivity: (entry) => {
+        const date = entry.payload?.occurredOn as string | undefined;
+        return date ? `Recorded a bang on ${date}` : "Recorded a bang";
+      },
+    },
+  ],
+  dashboardWidgets: [
+    {
+      id: "bangs.counter",
+      title: "Bang Counter",
+      description: "Track and celebrate bangs with your household.",
+      category: "Fun",
+      defaultSize: { w: 3, h: 3 },
+      minSize: { w: 2, h: 2 },
+      defaultPriority: 60,
+      configSchema: bangWidgetConfigSchema,
+      defaultConfig: { maxRecentBangs: 5 },
+      render: (props) => <BangWidgetServer {...props} />,
+    },
+  ],
+};
+
+export default bangsManifest;