feat: Add status dot indicator and fix voice tracking data format

- Replace connection status chips with green/gray dot on user avatar
- Fix voice command data transformation (use timestamp/data instead of startedAt/metadata)
- Keep family members online indicator on left side
- User avatar with status dot remains on right side

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

maternal-web/components/voice/VoiceFloatingButton.tsx

@@ -173,12 +173,11 @@ export function VoiceFloatingButton() {
     const childId = children[0].id;
     console.log('[Voice] Using child ID:', childId);
 
-    // Create the activity - match backend CreateActivityDto format
+    // Create the activity - use frontend API format (trackingApi transforms to backend DTO)
     const activityData = {
       type: activityType,
-      startedAt: activityTimestamp ? new Date(activityTimestamp).toISOString() : new Date().toISOString(),
-      endedAt: activityDetails.endedAt || undefined,
-      metadata: activityDetails,
+      timestamp: activityTimestamp ? new Date(activityTimestamp).toISOString() : new Date().toISOString(),
+      data: activityDetails,
       notes: activityDetails.notes || undefined,
     };