feat: Sync tab, hamburger menu, network status, browse UX

- Replace History tab with Sync tab (file list, NAS status, free-up-space retention)
- Add AppMenuView hamburger sheet (History, Errors, Connection Status, Sync Activity)
- BackupView: Kisani logo chip in toolbar, hamburger menu button, swipeable ring
  pages (progress/pending/failed/uploaded), always-visible compact stats strip
- SettingsView: NETWORK section (SSID, NAS reachability, trusted-network warning,
  refresh button)
- BrowseView: pull-to-refresh, long-press context menu on items
- LANMonitor: nasReachable, nasCheckTime, checkNASReachability(host:port:)
- ConnectionStore: localRetentionDays (0/60/90/365 days)
- Regenerate xcodeproj with xcodegen to include new files

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

Features/MainTabView.swift

@@ -27,8 +27,8 @@ struct iPhoneTabLayout: View {
             NavigationStack { BackupView() }
                 .tabItem { Label("Backup", systemImage: "arrow.up.doc.fill") }
 
-            NavigationStack { HistoryView() }
-                .tabItem { Label("History", systemImage: "clock.arrow.circlepath") }
+            NavigationStack { SyncView() }
+                .tabItem { Label("Sync", systemImage: "arrow.triangle.2.circlepath") }
 
             NavigationStack {
                 if let conn = ConnectionStore.shared.savedConnection {
@@ -51,15 +51,15 @@ struct iPadSidebarLayout: View {
         NavigationSplitView {
             List(selection: $selection) {
                 Label("Backup", systemImage: "arrow.up.doc.fill").tag("backup")
-                Label("History", systemImage: "clock.arrow.circlepath").tag("history")
+                Label("Sync", systemImage: "arrow.triangle.2.circlepath").tag("sync")
                 Label("Browse", systemImage: "folder.fill").tag("browse")
                 Label("Settings", systemImage: "gearshape.fill").tag("settings")
             }
-            .navigationTitle("NASBackup")
+            .navigationTitle("Kisani")
         } detail: {
             switch selection {
             case "backup":  BackupView()
-            case "history": HistoryView()
+            case "sync":    SyncView()
             case "browse":
                 if let conn = ConnectionStore.shared.savedConnection {
                     BrowseView(connection: conn, selectedPath: .constant("/"))