fix: UX audit — code-review findings

- Photo client-side limit: 5MB → 30MB (matches server)
- OTHER event shows notes preview in dashboard + timeline summaries
- Stats: add "Activités par jour" chart (Bain/Balade/Plat ventre/Autre)
- Combined diaper (wet→stool): show color/amount pickers, pass metadata
- Quick-add FAB: 4-col → 5-col grid (14 types in 3 rows instead of 4)
- Stool color buttons: force dark text, readable on light bg in dark mode
- Reminders: mark taken (✓) sets lastSentAt, ↺ clears it; shows elapsed

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/(app)/timeline/page.tsx

@@ -65,6 +65,7 @@ function getEventSummary(event: Event): string {
   if ((event.type === "NAP" || event.type === "NIGHT_SLEEP") && event.endedAt) {
     return formatDuration(new Date(event.startedAt), new Date(event.endedAt));
   }
+  if (event.type === "OTHER") return event.notes ? event.notes.slice(0, 50) : "";
   return "";
 }