v1.0.59: pause/resume sync

New PAUSED status. When a sync is running, the sync button becomes a
pause button (⏸). Tapping it cancels the WorkManager job and sets the
status to PAUSED (purple). The button then becomes a play button (▶) to
resume. Works in both the home screen card and the pair detail screen.

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

app/src/main/kotlin/com/syncflow/ui/home/HomeViewModel.kt

@@ -8,6 +8,7 @@ import androidx.work.WorkManager
 import com.syncflow.data.db.SyncPairDao
 import com.syncflow.data.db.entities.SyncPairEntity
 import com.syncflow.domain.model.ScheduleType
+import com.syncflow.domain.model.SyncStatus
 import com.syncflow.worker.FileWatchService
 import com.syncflow.worker.SyncWorker
 import dagger.hilt.android.lifecycle.HiltViewModel
@@ -32,6 +33,11 @@ class HomeViewModel @Inject constructor(
         workManager.enqueue(req)
     }
 
+    fun pauseSync(pair: SyncPairEntity) {
+        workManager.cancelAllWorkByTag("sync_${pair.id}")
+        viewModelScope.launch { syncPairDao.updateStatus(pair.id, SyncStatus.PAUSED) }
+    }
+
     fun toggleEnabled(pair: SyncPairEntity) {
         viewModelScope.launch {
             val nowEnabled = !pair.isEnabled