Fix 5 build issues: add ButtonStyles to project, actor isolation, buffer mutability

- Re-ran xcodegen so ButtonStyles.swift is included (fixes PrimaryButtonStyle
  and ScaleButtonStyle not in scope in LoginView and LANTriggerSection)
- BackgroundTaskManager: access BackupEngine.shared inside @MainActor Task
  instead of nonisolated context
- SFTPService: change var buffer → let (never mutated)

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

NASBackup.xcodeproj/project.pbxproj

@@ -37,6 +37,7 @@
 		DCE9AF4F0160E323224E3553 /* PhotoLibraryProtocol.swift in Sources */ = {isa = PBXBuildFile; fileRef = 74E2AF8B56C469E0D94EFE94 /* PhotoLibraryProtocol.swift */; };
 		DF719EAD5727B335001DB50A /* ConnectView.swift in Sources */ = {isa = PBXBuildFile; fileRef = EE318B60576B11E80862664D /* ConnectView.swift */; };
 		E830DB3078A8873382A77B63 /* BackupResult.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4AEFE4959C08B94AE9584A11 /* BackupResult.swift */; };
+		ED0D2A1D05B5898BCCE9EA0A /* ButtonStyles.swift in Sources */ = {isa = PBXBuildFile; fileRef = CA0969FC7D7E0EE313E29D55 /* ButtonStyles.swift */; };
 		F9219423E73718D8AB604EB1 /* ConnectionStore.swift in Sources */ = {isa = PBXBuildFile; fileRef = D87319355D902007618A91AE /* ConnectionStore.swift */; };
 		FA646815F98D36CAB180072A /* BrowseView.swift in Sources */ = {isa = PBXBuildFile; fileRef = D947C8F8945A2AB081BBD0EF /* BrowseView.swift */; };
 		FDC18499CC21A58C2F6F1BDB /* BackupJob.swift in Sources */ = {isa = PBXBuildFile; fileRef = 47E762898E351192399FC739 /* BackupJob.swift */; };
@@ -65,8 +66,9 @@
 		A8F24C7DD7A503A0D561F3FB /* LoginView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LoginView.swift; sourceTree = "<group>"; };
 		AC73AD75762D4357D171CDA4 /* BackupViewModel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BackupViewModel.swift; sourceTree = "<group>"; };
 		B36E23852EF12DC14A2DF2DC /* NASBackupApp.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NASBackupApp.swift; sourceTree = "<group>"; };
-		C755BFDD42D46A3FB490A4BB /* NASBackup.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = NASBackup.app; sourceTree = BUILT_PRODUCTS_DIR; };
+		C755BFDD42D46A3FB490A4BB /* NASBackup.app */ = {isa = PBXFileReference; includeInIndex = 0; lastKnownFileType = wrapper.application; path = NASBackup.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		C955FEF6710E3667C7A73A02 /* ProgressRing.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ProgressRing.swift; sourceTree = "<group>"; };
+		CA0969FC7D7E0EE313E29D55 /* ButtonStyles.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ButtonStyles.swift; sourceTree = "<group>"; };
 		D87319355D902007618A91AE /* ConnectionStore.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ConnectionStore.swift; sourceTree = "<group>"; };
 		D947C8F8945A2AB081BBD0EF /* BrowseView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BrowseView.swift; sourceTree = "<group>"; };
 		DEBD92D10D70B957192E271F /* SMBService.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SMBService.swift; sourceTree = "<group>"; };
@@ -156,6 +158,7 @@
 		3E7F8DE77B7CDC7009B54D63 /* Components */ = {
 			isa = PBXGroup;
 			children = (
+				CA0969FC7D7E0EE313E29D55 /* ButtonStyles.swift */,
 				83C13DD3EB4823AA98D51AF2 /* FolderRow.swift */,
 				C955FEF6710E3667C7A73A02 /* ProgressRing.swift */,
 				8845003C87961174302AC990 /* ToggleRow.swift */,
@@ -307,6 +310,7 @@
 				LastUpgradeCheck = 1500;
 				TargetAttributes = {
 					32316B985B8906FE4CB97730 = {
+						DevelopmentTeam = "";
 						ProvisioningStyle = Automatic;
 					};
 				};
@@ -349,6 +353,7 @@
 				B7DBF1420838AD3397A280B5 /* BackupView.swift in Sources */,
 				A6276840D40211EB446293A9 /* BackupViewModel.swift in Sources */,
 				FA646815F98D36CAB180072A /* BrowseView.swift in Sources */,
+				ED0D2A1D05B5898BCCE9EA0A /* ButtonStyles.swift in Sources */,
 				DF719EAD5727B335001DB50A /* ConnectView.swift in Sources */,
 				C6AAC362F058E7836A91AC30 /* ConnectViewModel.swift in Sources */,
 				F9219423E73718D8AB604EB1 /* ConnectionStore.swift in Sources */,
@@ -382,7 +387,6 @@
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				CODE_SIGN_ENTITLEMENTS = NASBackup.entitlements;
 				CODE_SIGN_IDENTITY = "iPhone Developer";
-				DEVELOPMENT_TEAM = K8BLMMR883;
 				INFOPLIST_FILE = App/Info.plist;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
@@ -467,7 +471,6 @@
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				CODE_SIGN_ENTITLEMENTS = NASBackup.entitlements;
 				CODE_SIGN_IDENTITY = "iPhone Developer";
-				DEVELOPMENT_TEAM = K8BLMMR883;
 				INFOPLIST_FILE = App/Info.plist;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",

Services/BackgroundTaskManager.swift

@@ -47,9 +47,8 @@ final class BackgroundTaskManager {
 
     private static func handleBackupTask(_ task: BGProcessingTask) {
         scheduleBackup()
-        let engine = BackupEngine.shared
+        task.expirationHandler = { Task { await BackupEngine.shared.cancel() } }
-        task.expirationHandler = { Task { await engine.cancel() } }
+        Task { @MainActor in
-        Task {
             do {
                 let store = ConnectionStore.shared
                 guard let connection = store.savedConnection else {
@@ -57,7 +56,7 @@ final class BackgroundTaskManager {
                     return
                 }
                 let filter = store.backupFilter
-                _ = try await engine.run(connection: connection, filter: filter, triggeredByLAN: true)
+                _ = try await BackupEngine.shared.run(connection: connection, filter: filter, triggeredByLAN: true)
                 task.setTaskCompleted(success: true)
             } catch {
                 task.setTaskCompleted(success: false)

Services/SFTPService.swift

@@ -89,7 +89,7 @@ final class SFTPService: NASTransferProtocol {
                 filePath: remotePath,
                 flags: [.write, .create, .truncate]
             ) { file in
-                var buffer = ByteBuffer(data: data)
+                let buffer = ByteBuffer(data: data)
                 try await file.write(buffer, at: 0)
             }
             progress(total, total)