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>

Services/PhotoLibraryService.swift

@@ -44,25 +44,26 @@ final class PhotoLibraryService: PhotoLibraryProtocol {
         let result = PHAsset.fetchAssets(with: options)
         var assets: [PhotoAsset] = []
         result.enumerateObjects { asset, _, _ in
-            let isScreenshot = asset.mediaSubtypes.contains(.photoScreenshot)
-            let resources = PHAssetResource.assetResources(for: asset)
-            // RAW files are identified by an alternate photo resource (RAW+JPEG pairs)
-            let isRAW = resources.contains { $0.type == .alternatePhoto }
-            if isRAW && !filter.includeRAW { return }
+            autoreleasepool {
+                let isScreenshot = asset.mediaSubtypes.contains(.photoScreenshot)
+                let resources = PHAssetResource.assetResources(for: asset)
+                let isRAW = resources.contains { $0.type == .alternatePhoto }
+                if isRAW && !filter.includeRAW { return }
 
-            let filename = resources.first?.originalFilename ?? "\(asset.localIdentifier).jpg"
+                let filename = resources.first?.originalFilename ?? "\(asset.localIdentifier).jpg"
 
-            assets.append(PhotoAsset(
-                localIdentifier: asset.localIdentifier,
-                filename: filename,
-                creationDate: asset.creationDate,
-                mediaType: asset.mediaType,
-                pixelWidth: asset.pixelWidth,
-                pixelHeight: asset.pixelHeight,
-                duration: asset.duration,
-                isScreenshot: isScreenshot,
-                isRAW: isRAW
-            ))
+                assets.append(PhotoAsset(
+                    localIdentifier: asset.localIdentifier,
+                    filename: filename,
+                    creationDate: asset.creationDate,
+                    mediaType: asset.mediaType,
+                    pixelWidth: asset.pixelWidth,
+                    pixelHeight: asset.pixelHeight,
+                    duration: asset.duration,
+                    isScreenshot: isScreenshot,
+                    isRAW: isRAW
+                ))
+            }
         }
         return assets
     }