Revert "feat(#677): add native version of privacy screen (still not h…

…appy with Android version)"

This reverts commit e409089.

app/android/app/src/main/kotlin/de/hpi/frasecys/MainActivity.kt

@@ -0,0 +1,6 @@
+package de.hpi.pharme
+
+import io.flutter.embedding.android.FlutterActivity
+
+class MainActivity: FlutterActivity() {
+}

app/ios/Runner/AppDelegate.swift

@@ -1,69 +1,13 @@
 import UIKit
 import Flutter
 
-// Add privacy screen, based on
-// https://articles.wesionary.team/securing-your-flutter-app-implementing-a-privacy-screen-61383ce09f0a
-
 @UIApplicationMain
 @objc class AppDelegate: FlutterAppDelegate {
-  private var flutterViewController: FlutterViewController!
-  private var securityChannel: FlutterMethodChannel!
-  private var blurEffectView: UIVisualEffectView?
-  private var isInBackground: Bool = false // Track whether app is in background
-
   override func application(
     _ application: UIApplication,
     didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
   ) -> Bool {
     GeneratedPluginRegistrant.register(with: self)
-
-    setupFlutterCommunication()
-
     return super.application(application, didFinishLaunchingWithOptions: launchOptions)
   }
-
-  private func setupFlutterCommunication() {
-    flutterViewController = window?.rootViewController as? FlutterViewController
-    securityChannel = FlutterMethodChannel(
-      name: "security",
-      binaryMessenger: flutterViewController.binaryMessenger
-    )
-
-    securityChannel.setMethodCallHandler(handle)
-  }
-
-  override func applicationWillResignActive(_ application: UIApplication) {
-    isInBackground = true // App will be inactive
-    enableAppSecurity()
-  }
-
-  override func applicationDidBecomeActive(_ application: UIApplication) {
-    // Check if the app was in background before becoming active
-    if isInBackground {
-      disableAppSecurity()
-      isInBackground = false
-    }
-  }
-
-  private func handle(_ call: FlutterMethodCall, result: @escaping FlutterResult) {
-    switch call.method {
-    case "enableAppSecurity":
-      result(nil)
-    case "disableAppSecurity":
-      result(nil)
-    default:
-      result(FlutterMethodNotImplemented)
-    }
-  }
-
-  private func enableAppSecurity() {
-    let blurEffect = UIBlurEffect(style: .light)
-    blurEffectView = UIVisualEffectView(effect: blurEffect)
-    blurEffectView?.frame = window!.frame
-    window?.addSubview(blurEffectView!)
-  }
-
-  private func disableAppSecurity() {
-    blurEffectView?.removeFromSuperview()
-  }
 }