[APP-1934] replace image grid layout with carousel (#10157)

Co-authored-by: RetroSunstar <57507616+RetroSunstar@users.noreply.github.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-authored-by: Eric Bailey <git@esb.lol>

src/analytics/metrics/types.ts

@@ -1046,4 +1046,19 @@ export type Events = {
   'profile:associated:germ:click-self-info': {}
   'profile:associated:germ:self-disconnect': {}
   'profile:associated:germ:self-reconnect': {}
+
+  // Gallery carousel events
+  'post:gallery:swipe': {
+    fromImage: number
+    toImage: number
+    totalImages: number
+  }
+  'post:gallery:openLightbox': {
+    fromImage: number
+    totalImages: number
+  }
+  'post:gallery:impression': {
+    totalImages: number
+    postUri: string
+  }
 }