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

drizzle/meta/0008_snapshot.json

@@ -1,6 +1,6 @@
 {
-  "id": "fc208bad-8bfd-452d-876f-7e853f699931",
-  "prevId": "cb06cd57-d5a0-4fb7-bbf3-335173a1168c",
+  "id": "ff1f5ff1-7539-4c5e-a20d-f01c719ef198",
+  "prevId": "fc208bad-8bfd-452d-876f-7e853f699931",
   "version": "7",
   "dialect": "postgresql",
   "tables": {