v1.0.63: live sync progress counters, pause/resume, .gitignore fix

- SyncEngine: accepts onProgress callback — emits uploaded/downloaded/
  deleted/bytes counts atomically as each file completes
- SyncWorker: streams progress to WorkManager data so the UI can poll
  it live; reports per-run counters in the completion notification;
  adds pause/resume support
- HomeViewModel/PairDetailViewModel: subscribe to live WorkManager
  progress and surface it via SyncProgress state
- SyncPairEntity/SyncPairDao/SyncDatabase: persist last-run counters
  (uploaded, downloaded, deleted, bytesTransferred) in the DB with a
  Room migration (v3→v4)
- AppModule: provides WorkManager as an injectable singleton
- .gitignore: add .kotlin/ to exclude compiler session files

Security: no new issues — all logging via Timber (debug-only), DB
queries use Room parameterized API, file sharing via FileProvider.

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

app/src/main/kotlin/com/syncflow/ui/files/FilesScreen.kt

@@ -51,6 +51,16 @@ fun FilesScreen(
     val context = LocalContext.current
     val snackbarHostState = remember { SnackbarHostState() }
     val scope = rememberCoroutineScope()
+    val accounts by vm.accounts.collectAsState()
+    var selectedAccountId by remember { mutableStateOf(-1L) }
+
+    LaunchedEffect(accounts) {
+        if (selectedAccountId == -1L && accounts.isNotEmpty()) selectedAccountId = accounts.first().id
+    }
+
+    val cloudLabel = accounts.find { it.id == selectedAccountId }?.displayName
+        ?: accounts.firstOrNull()?.displayName
+        ?: "Cloud"
 
     LaunchedEffect(Unit) {
         vm.fileAction.collect { action ->
@@ -108,26 +118,29 @@ fun FilesScreen(
                     selected = activeTab == 0,
                     onClick = { activeTab = 0 },
                     shape = SegmentedButtonDefaults.itemShape(0, 2),
+                    icon = { SegmentedButtonDefaults.Icon(active = activeTab == 0, activeContent = { Icon(Icons.Default.PhoneAndroid, null, Modifier.size(16.dp)) }) },
                 ) {
-                    Icon(Icons.Default.PhoneAndroid, null, Modifier.size(16.dp))
-                    Spacer(Modifier.width(6.dp))
                     Text("Phone")
                 }
                 SegmentedButton(
                     selected = activeTab == 1,
                     onClick = { activeTab = 1 },
                     shape = SegmentedButtonDefaults.itemShape(1, 2),
+                    icon = { SegmentedButtonDefaults.Icon(active = activeTab == 1, activeContent = { Icon(Icons.Default.Cloud, null, Modifier.size(16.dp)) }) },
                 ) {
-                    Icon(Icons.Default.Cloud, null, Modifier.size(16.dp))
-                    Spacer(Modifier.width(6.dp))
-                    Text("Cloud")
+                    Text(cloudLabel, maxLines = 1, overflow = androidx.compose.ui.text.style.TextOverflow.Ellipsis)
                 }
             }
             HorizontalDivider()
 
             when (activeTab) {
                 0 -> LocalExplorer(modifier = Modifier.weight(1f))
-                1 -> CloudExplorer(vm = vm, modifier = Modifier.weight(1f))
+                1 -> CloudExplorer(
+                    vm = vm,
+                    selectedAccountId = selectedAccountId,
+                    onAccountSelect = { selectedAccountId = it },
+                    modifier = Modifier.weight(1f),
+                )
             }
         }
 
@@ -372,9 +385,13 @@ private fun LocalExplorer(modifier: Modifier = Modifier) {
 // ── Cloud file explorer ───────────────────────────────────────────────────────
 
 @Composable
-private fun CloudExplorer(vm: FilesViewModel, modifier: Modifier = Modifier) {
+private fun CloudExplorer(
+    vm: FilesViewModel,
+    selectedAccountId: Long,
+    onAccountSelect: (Long) -> Unit,
+    modifier: Modifier = Modifier,
+) {
     val accounts by vm.accounts.collectAsState()
-    var selectedId by remember { mutableStateOf(-1L) }
     val cloudVm: RemoteBrowserViewModel = hiltViewModel(key = "cloud_explorer")
     val state by cloudVm.state.collectAsState()
     val breadcrumbState = rememberLazyListState()
@@ -382,11 +399,8 @@ private fun CloudExplorer(vm: FilesViewModel, modifier: Modifier = Modifier) {
     var searchQuery by remember { mutableStateOf("") }
     var searchActive by remember { mutableStateOf(false) }
 
-    LaunchedEffect(accounts) {
-        if (selectedId == -1L && accounts.isNotEmpty()) {
-            selectedId = accounts.first().id
-            cloudVm.init(selectedId, "/")
-        }
+    LaunchedEffect(selectedAccountId) {
+        if (selectedAccountId != -1L) cloudVm.init(selectedAccountId, "/")
     }
 
     LaunchedEffect(state.currentPath) {
@@ -426,8 +440,8 @@ private fun CloudExplorer(vm: FilesViewModel, modifier: Modifier = Modifier) {
             ) {
                 items(accounts) { acct ->
                     FilterChip(
-                        selected = acct.id == selectedId,
-                        onClick = { selectedId = acct.id; cloudVm.init(acct.id, "/") },
+                        selected = acct.id == selectedAccountId,
+                        onClick = { onAccountSelect(acct.id); cloudVm.init(acct.id, "/") },
                         label = { Text(acct.displayName, maxLines = 1) },
                         leadingIcon = { Icon(Icons.Default.Cloud, null, Modifier.size(14.dp)) },
                     )
@@ -520,7 +534,7 @@ private fun CloudExplorer(vm: FilesViewModel, modifier: Modifier = Modifier) {
                             file = entry,
                             onClick = {
                                 if (entry.isDirectory) cloudVm.navigateTo(entry.path)
-                                else vm.openCloudFile(selectedId, entry.path)
+                                else vm.openCloudFile(selectedAccountId, entry.path)
                             },
                         )
                     }