Replace WebView-based container app with SwiftUI

The container app previously used a WKWebView to display HTML/CSS/JS
for the "enable extension" screen. This was overly complex for what
is essentially a simple informational view.

Replaced with a pure SwiftUI implementation:
- CacheStatusApp.swift: SwiftUI App entry point
- ContentView.swift: Native UI with extension state checking

Benefits:
- Reduced from ~170 lines + storyboard to ~80 lines total
- Native macOS styling with automatic dark mode support
- No WebKit dependency
- Simpler, more maintainable codebase

Removed:
- AppDelegate.swift, ViewController.swift
- Main.storyboard
- Resources/ folder (Main.html, Style.css, Script.js, Icon.png)

Author: bartTC

CF Cache Status/CF Cache Status.xcodeproj/project.pbxproj

@@ -103,12 +103,10 @@
 		5B8F9F0B2F07E4C50092E4D0 /* CF Cache Status */ = {
 			isa = PBXGroup;
 			children = (
-				5B8F9F0C2F07E4C50092E4D0 /* AppDelegate.swift */,
-				5B8F9F182F07E4C50092E4D0 /* ViewController.swift */,
-				5B8F9F1A2F07E4C50092E4D0 /* Main.storyboard */,
+				5BSWIFTUI002F09A0000000001 /* CacheStatusApp.swift */,
+				5BSWIFTUI022F09A0000000001 /* ContentView.swift */,
 				5B8F9F1D2F07E4C60092E4D0 /* Assets.xcassets */,
 				5B8F9F1F2F07E4C60092E4D0 /* Info.plist */,
-				5B8F9F0E2F07E4C50092E4D0 /* Resources */,
 			);
 			path = "CF Cache Status";
 			sourceTree = "<group>";
@@ -235,12 +233,7 @@
 			isa = PBXResourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
-				5B8F9F132F07E4C50092E4D0 /* Icon.png in Resources */,
-				5B8F9F1C2F07E4C50092E4D0 /* Main.storyboard in Resources */,
-				5B8F9F172F07E4C50092E4D0 /* Script.js in Resources */,
-				5B8F9F112F07E4C50092E4D0 /* Main.html in Resources */,
 				5B8F9F1E2F07E4C60092E4D0 /* Assets.xcassets in Resources */,
-				5B8F9F152F07E4C50092E4D0 /* Style.css in Resources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -265,8 +258,8 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
-				5B8F9F192F07E4C50092E4D0 /* ViewController.swift in Sources */,
-				5B8F9F0D2F07E4C50092E4D0 /* AppDelegate.swift in Sources */,
+				5BSWIFTUI012F09A0000000001 /* CacheStatusApp.swift in Sources */,
+				5BSWIFTUI032F09A0000000001 /* ContentView.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -431,6 +424,7 @@
 			buildSettings = {
 				CODE_SIGN_STYLE = Automatic;
 				CURRENT_PROJECT_VERSION = 1;
+				DEVELOPMENT_TEAM = H95JUDBHF7;
 				ENABLE_APP_SANDBOX = YES;
 				ENABLE_HARDENED_RUNTIME = YES;
 				ENABLE_USER_SELECTED_FILES = readonly;
@@ -465,6 +459,7 @@
 			buildSettings = {
 				CODE_SIGN_STYLE = Automatic;
 				CURRENT_PROJECT_VERSION = 1;
+				DEVELOPMENT_TEAM = H95JUDBHF7;
 				ENABLE_APP_SANDBOX = YES;
 				ENABLE_HARDENED_RUNTIME = YES;
 				ENABLE_USER_SELECTED_FILES = readonly;

CF Cache Status/CF Cache Status/AppDelegate.swift

@@ -0,0 +1,17 @@
+//
+//  CacheStatusApp.swift
+//  CF Cache Status
+//
+
+import SwiftUI
+
+@main
+struct CacheStatusApp: App {
+    var body: some Scene {
+        Window("Cache Status", id: "main") {
+            ContentView()
+        }
+        .windowResizability(.contentSize)
+        .defaultPosition(.center)
+    }
+}

CF Cache Status/CF Cache Status/Base.lproj/Main.storyboard

@@ -0,0 +1,68 @@
+//
+//  ContentView.swift
+//  CF Cache Status
+//
+
+import SwiftUI
+import SafariServices
+
+let extensionBundleIdentifier = "com.cfcachestatus.CF-Cache-Status.Extension"
+
+struct ContentView: View {
+    @State private var extensionEnabled: Bool?
+
+    private var statusText: String {
+        guard let enabled = extensionEnabled else {
+            return "You can turn on Cache Status's extension in the Extensions section of Safari Settings."
+        }
+        if enabled {
+            return "Cache Status's extension is currently on. You can turn it off in the Extensions section of Safari Settings."
+        } else {
+            return "Cache Status's extension is currently off. You can turn it on in the Extensions section of Safari Settings."
+        }
+    }
+
+    var body: some View {
+        VStack(spacing: 20) {
+            Image(systemName: "cloud")
+                .font(.system(size: 72, weight: .thin))
+                .foregroundStyle(.secondary)
+
+            Text(statusText)
+                .multilineTextAlignment(.center)
+                .foregroundStyle(.secondary)
+
+            Button("Quit and Open Safari Settings…") {
+                openSafariPreferences()
+            }
+            .buttonStyle(.borderedProminent)
+        }
+        .padding(40)
+        .frame(width: 400, height: 300)
+        .onAppear {
+            checkExtensionState()
+        }
+    }
+
+    private func checkExtensionState() {
+        SFSafariExtensionManager.getStateOfSafariExtension(withIdentifier: extensionBundleIdentifier) { state, error in
+            DispatchQueue.main.async {
+                if let state = state, error == nil {
+                    extensionEnabled = state.isEnabled
+                }
+            }
+        }
+    }
+
+    private func openSafariPreferences() {
+        SFSafariApplication.showPreferencesForExtension(withIdentifier: extensionBundleIdentifier) { _ in
+            DispatchQueue.main.async {
+                NSApplication.shared.terminate(nil)
+            }
+        }
+    }
+}
+
+#Preview {
+    ContentView()
+}