fix: Fix 3 critical bugs - voice tracking, session persistence, and status updates

BUG-1: Voice tracking not saving activities
- Fix activity data format to match backend CreateActivityDto
- Change 'timestamp' to 'startedAt' and 'data' to 'metadata'
- Remove duplicate voice button from mobile TabBar

BUG-2: Session persistence after revocation
- Add logout() call when revoking all sessions
- Add logout() call when removing all devices
- Ensures user is logged out after session/device revocation
- Clears tokens and redirects to login

BUG-3: Voice modal status not updating
- Set identifiedActivity before saving to show tracker name
- Display "Adding to [tracker] tracker..." during save
- Improves UX by showing which tracker is being updated

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

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

maternal-web/components/layouts/TabBar/TabBar.tsx

@@ -110,34 +110,7 @@ export const TabBar = () => {
         </BottomNavigation>
       </Paper>
 
-      {/* Voice Command Floating Button - Mobile Only */}
-      <Fab
-        color="secondary"
-        aria-label="voice command"
-        onClick={() => {
-          // Trigger voice command - will integrate with existing VoiceFloatingButton
-          const voiceButton = document.querySelector('[aria-label="voice input"]') as HTMLButtonElement;
-          if (voiceButton) {
-            voiceButton.click();
-          }
-        }}
-        sx={{
-          display: { xs: 'flex', md: 'none' },
-          position: 'fixed',
-          bottom: 40,
-          left: '50%',
-          transform: 'translateX(-50%)',
-          zIndex: 1100,
-          width: 56,
-          height: 56,
-          bgcolor: '#FF69B4',
-          '&:hover': {
-            bgcolor: '#FF1493',
-          },
-        }}
-      >
-        <Mic />
-      </Fab>
+      {/* Voice Command Floating Button is now centralized in layout.tsx - removed duplicate */}
     </>
   );
 };