feat: Kisani rebrand, step-based onboarding flow, dark mode fixes

- Rename app to Kisani in all UI text and Face ID prompt
- Replace flat 2-state RootView with 5-step flow: ConnectView →
  LoginView → FolderSetupView → PhotoPermissionView → MainTabView
- Remove NavigationStack from LoginView (was causing nested-stack crash);
  drive navigation via ConnectionStore.isSessionActive
- Add FolderSetupView and PhotoPermissionView onboarding screens with
  step indicator (2/3, 3/3), spring entrance animations, and UGreen
  connection chip
- Fix dark mode button invisibility: PrimaryButtonStyle and PillButtonStyle
  now use AppTheme.inkInverse; GhostButtonStyle border uses ink.opacity(0.25)
- Add AppTheme.inkInverse adaptive token (dark bg ink on dark, white on light)
- Add ConnectionStore.isSessionActive (non-persisted) and
  onboardingPhotoShown (UserDefaults-persisted)
- Add os_log logging in LoginViewModel at auth start/success/failure
- Remove dead Help button from ConnectView
- UGreenCompatibilityBadge, KeychainStore, SavedConnections, extensions,
  PrivacyInfo.xcprivacy, unit test target and test stubs
- AppTheme: full UIColor dynamic provider tokens for dark/light adaptive color
- AppearanceMode enum + segmented picker in SettingsView
- BackupView: enlarged ring, removed options card and linear progress bar
- HistoryView: duration and bytes formatting, improved typography hierarchy

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

App/NASBackupApp.swift

@@ -1,4 +1,5 @@
 import SwiftUI
+import Photos
 
 @main
 struct NASBackupApp: App {
@@ -14,6 +15,7 @@ struct NASBackupApp: App {
                 .environmentObject(store)
                 .environmentObject(engine)
                 .environmentObject(lanMonitor)
+                .preferredColorScheme(store.appearanceMode.resolvedScheme)
         }
     }
 }
@@ -22,10 +24,21 @@ struct RootView: View {
     @EnvironmentObject var store: ConnectionStore
 
     var body: some View {
-        if store.savedConnection != nil {
-            LoginView()
-        } else {
-            ConnectView()
+        Group {
+            if store.savedConnection == nil {
+                ConnectView()
+            } else if !store.isSessionActive {
+                LoginView()
+            } else if store.savedConnection?.remotePath == "/" {
+                FolderSetupView()
+            } else if !store.onboardingPhotoShown {
+                PhotoPermissionView()
+            } else {
+                MainTabView()
+            }
         }
+        .animation(.spring(response: 0.4, dampingFraction: 0.85), value: store.isSessionActive)
+        .animation(.spring(response: 0.4, dampingFraction: 0.85), value: store.savedConnection?.remotePath)
+        .animation(.spring(response: 0.4, dampingFraction: 0.85), value: store.onboardingPhotoShown)
     }
 }

App/PrivacyInfo.xcprivacy

@@ -0,0 +1,44 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>NSPrivacyAccessedAPITypes</key>
+    <array>
+        <dict>
+            <key>NSPrivacyAccessedAPIType</key>
+            <string>NSPrivacyAccessedAPICategoryFileTimestamp</string>
+            <key>NSPrivacyAccessedAPITypeReasons</key>
+            <array>
+                <string>C617.1</string>
+            </array>
+        </dict>
+        <dict>
+            <key>NSPrivacyAccessedAPIType</key>
+            <string>NSPrivacyAccessedAPICategoryUserDefaults</string>
+            <key>NSPrivacyAccessedAPITypeReasons</key>
+            <array>
+                <string>CA92.1</string>
+            </array>
+        </dict>
+    </array>
+    <key>NSPrivacyCollectedDataTypes</key>
+    <array>
+        <dict>
+            <key>NSPrivacyCollectedDataType</key>
+            <string>NSPrivacyCollectedDataTypePhotosorVideos</string>
+            <key>NSPrivacyCollectedDataTypeLinked</key>
+            <false/>
+            <key>NSPrivacyCollectedDataTypeTracking</key>
+            <false/>
+            <key>NSPrivacyCollectedDataTypePurposes</key>
+            <array>
+                <string>NSPrivacyCollectedDataTypePurposeAppFunctionality</string>
+            </array>
+        </dict>
+    </array>
+    <key>NSPrivacyTracking</key>
+    <false/>
+    <key>NSPrivacyTrackingDomains</key>
+    <array/>
+</dict>
+</plist>