Implement data sync and cleanup

lib/screens/home/home_screen.dart

@@ -620,6 +620,25 @@ class _SettingsTab extends ConsumerWidget {
                     MaterialPageRoute(
                         builder: (context) => const ExportDataScreen()));
               }),
+              _buildSettingsTile(
+                context,
+                Icons.sync,
+                'Sync Data',
+                onTap: () async {
+                  ScaffoldMessenger.of(context).showSnackBar(
+                    const SnackBar(content: Text('Syncing data...')),
+                  );
+                  await ref.read(cycleEntriesProvider.notifier).syncData();
+                  if (context.mounted) {
+                    ScaffoldMessenger.of(context).showSnackBar(
+                      const SnackBar(
+                        content: Text('Sync complete'),
+                        backgroundColor: Colors.green,
+                      ),
+                    );
+                  }
+                },
+              ),
             ]),
             const SizedBox(height: 16),
             _buildSettingsGroup(context, 'Account', [