v1.0.23: functional Files tab, background service persistence, startup indexer, curved icon

- FilesScreen: per-file context menu (Open, Share, Rename, Delete), rename dialog,
  delete confirmation, FileProvider-based open/share intents, Snackbar error feedback
- FilesViewModel: FileAction sealed class + SharedFlow; openFile, shareFile,
  deleteFile, renameFile with DB cleanup; resolveFile handles SAF primary: URIs
- FileWatchService: stopWithTask=false keeps watcher alive after app swipe-away;
  catchupScan on startup detects changes missed while service was not running;
  SyncFileStateDao injected; FileObserver used for real-path SAF URIs
- BootReceiver: handles MY_PACKAGE_REPLACED to restart service after app update
- file_paths.xml: added external-path so FileProvider can serve /storage/emulated/0 files
- ic_launcher_foreground: three curved stroke-based arrows (quadratic bezier, round caps)

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

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

@@ -1,5 +1,6 @@
 package com.syncflow.ui.files
 
+import android.content.Context
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import com.syncflow.data.db.SyncFileStateDao
@@ -7,15 +8,26 @@ import com.syncflow.data.db.SyncPairDao
 import com.syncflow.data.db.entities.SyncFileStateEntity
 import com.syncflow.data.db.entities.SyncPairEntity
 import dagger.hilt.android.lifecycle.HiltViewModel
+import dagger.hilt.android.qualifiers.ApplicationContext
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.flow.*
+import kotlinx.coroutines.launch
+import timber.log.Timber
+import java.io.File
 import javax.inject.Inject
 
+sealed class FileAction {
+    data class Open(val file: File) : FileAction()
+    data class Share(val file: File) : FileAction()
+    data class Error(val message: String) : FileAction()
+}
+
 @OptIn(ExperimentalCoroutinesApi::class)
 @HiltViewModel
 class FilesViewModel @Inject constructor(
-    syncPairDao: SyncPairDao,
+    private val syncPairDao: SyncPairDao,
     private val fileStateDao: SyncFileStateDao,
+    @ApplicationContext private val context: Context,
 ) : ViewModel() {
 
     val pairs: StateFlow<List<SyncPairEntity>> = syncPairDao.observeAll()
@@ -35,5 +47,71 @@ class FilesViewModel @Inject constructor(
         }
         .stateIn(viewModelScope, SharingStarted.WhileSubscribed(5_000), emptyList())
 
+    private val _fileAction = MutableSharedFlow<FileAction>()
+    val fileAction: SharedFlow<FileAction> = _fileAction
+
     fun selectPair(id: Long) { _selectedPairId.value = id }
+
+    fun openFile(file: SyncFileStateEntity) {
+        val resolved = resolveFile(file) ?: return
+        viewModelScope.launch { _fileAction.emit(FileAction.Open(resolved)) }
+    }
+
+    fun shareFile(file: SyncFileStateEntity) {
+        val resolved = resolveFile(file) ?: return
+        viewModelScope.launch { _fileAction.emit(FileAction.Share(resolved)) }
+    }
+
+    fun deleteFile(file: SyncFileStateEntity) {
+        viewModelScope.launch {
+            try {
+                val resolved = resolveFile(file)
+                resolved?.delete()
+                fileStateDao.delete(file.syncPairId, file.relativePath)
+            } catch (e: Exception) {
+                Timber.e(e, "Delete failed: ${file.relativePath}")
+                _fileAction.emit(FileAction.Error("Delete failed: ${e.message}"))
+            }
+        }
+    }
+
+    fun renameFile(file: SyncFileStateEntity, newName: String) {
+        viewModelScope.launch {
+            try {
+                val resolved = resolveFile(file) ?: return@launch
+                val parent = resolved.parentFile ?: return@launch
+                val dest = File(parent, newName)
+                if (!resolved.renameTo(dest)) {
+                    _fileAction.emit(FileAction.Error("Rename failed"))
+                    return@launch
+                }
+                // Update DB: delete old state; the next sync will re-detect as a new upload
+                fileStateDao.delete(file.syncPairId, file.relativePath)
+            } catch (e: Exception) {
+                Timber.e(e, "Rename failed: ${file.relativePath}")
+                _fileAction.emit(FileAction.Error("Rename failed: ${e.message}"))
+            }
+        }
+    }
+
+    private fun resolveFile(file: SyncFileStateEntity): File? {
+        val pair = selectedPair.value ?: return null
+        val root = safTreeUriToRealPath(pair.localPath) ?: pair.localPath
+        val f = File(root, file.relativePath)
+        if (!f.exists()) {
+            viewModelScope.launch { _fileAction.emit(FileAction.Error("File not found on device")) }
+            return null
+        }
+        return f
+    }
+
+    private fun safTreeUriToRealPath(uriString: String): String? {
+        if (!uriString.startsWith("content://")) return uriString
+        return try {
+            val treeUri = android.net.Uri.parse(uriString)
+            val docId = android.provider.DocumentsContract.getTreeDocumentId(treeUri)
+            if (docId.startsWith("primary:")) "/storage/emulated/0/${docId.removePrefix("primary:")}"
+            else null
+        } catch (e: Exception) { null }
+    }
 }