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/server/actions.ts

@@ -0,0 +1,50 @@
+"use server";
+
+import { revalidatePath } from "next/cache";
+import { z } from "zod";
+import { db } from "@/lib/db";
+import { getCurrentSession } from "@/lib/session";
+import { logActivity } from "@/modules/_core/activity";
+import { bangEvents } from "../schema";
+
+const addBangInput = z.object({
+  occurredOn: z
+    .string()
+    .regex(/^\d{4}-\d{2}-\d{2}$/, "Must be YYYY-MM-DD")
+    .optional(),
+});
+
+function todayString(): string {
+  const d = new Date();
+  return `${d.getFullYear()}-${String(d.getMonth() + 1).padStart(2, "0")}-${String(d.getDate()).padStart(2, "0")}`;
+}
+
+export async function addBang(input: z.input<typeof addBangInput> = {}) {
+  const parsed = addBangInput.parse(input);
+  const { user, household } = await getCurrentSession();
+
+  const occurredOn = parsed.occurredOn ?? todayString();
+
+  const [bang] = await db
+    .insert(bangEvents)
+    .values({
+      householdId: household.id,
+      recordedBy: user.id,
+      occurredOn,
+    })
+    .returning();
+
+  if (!bang) throw new Error("Bang was not recorded");
+
+  await logActivity({
+    entityType: "bangs.event",
+    entityId: bang.id,
+    action: "create",
+    payload: { occurredOn },
+  });
+
+  revalidatePath("/");
+  revalidatePath("/d/[slug]", "page");
+
+  return bang;
+}