Update iOS app icon to iOS 26 Liquid Glass variants (#36510)

Removes the previous `AppIcon.appiconset` bundle and replaces it with
all of the necessary asset slices to enable all of the Liquid Glass
variants of the app icon on iOS 26, while also preserving backwards
compatibility with older iOS versions.

<img width="1164" height="388" alt="LiquidGlass"
src="https://github.com/user-attachments/assets/7d6e7a90-3fe5-4853-9c63-35144359f49e"
/>

---------

Co-authored-by: Dean Herbert <pe@ppy.sh>

osu.Desktop/OsuGameDesktop.cs

@@ -146,9 +146,13 @@ namespace osu.Desktop
         {
             base.SetHost(host);
 
-            var iconStream = Assembly.GetExecutingAssembly().GetManifestResourceStream(GetType(), "lazer.ico");
+            // Apple operating systems use a better icon provided via external assets.
-            if (iconStream != null)
+            if (!RuntimeInfo.IsApple)
-                host.Window.SetIconFromStream(iconStream);
+            {
+                var iconStream = Assembly.GetExecutingAssembly().GetManifestResourceStream(GetType(), "lazer.ico");
+                if (iconStream != null)
+                    host.Window.SetIconFromStream(iconStream);
+            }
 
             host.Window.Title = Name;
         }

osu.Game.Rulesets.Catch.Tests.iOS/Info.plist

@@ -35,11 +35,9 @@
 		<string>UIInterfaceOrientationLandscapeRight</string>
 		<string>UIInterfaceOrientationLandscapeLeft</string>
 	</array>
-	<key>XSAppIconAssets</key>
-	<string>Assets.xcassets/AppIcon.appiconset</string>
 	<key>UIApplicationSupportsIndirectInputEvents</key>
 	<true/>
 	<key>CADisableMinimumFrameDurationOnPhone</key>
 	<true/>
 </dict>
-</plist>
+</plist>

osu.Game.Rulesets.Mania.Tests.iOS/Info.plist

@@ -35,11 +35,9 @@
 		<string>UIInterfaceOrientationLandscapeRight</string>
 		<string>UIInterfaceOrientationLandscapeLeft</string>
 	</array>
-	<key>XSAppIconAssets</key>
-	<string>Assets.xcassets/AppIcon.appiconset</string>
 	<key>UIApplicationSupportsIndirectInputEvents</key>
 	<true/>
 	<key>CADisableMinimumFrameDurationOnPhone</key>
 	<true/>
 </dict>
-</plist>
+</plist>

osu.Game.Rulesets.Osu.Tests.iOS/Info.plist

@@ -35,11 +35,9 @@
 		<string>UIInterfaceOrientationLandscapeRight</string>
 		<string>UIInterfaceOrientationLandscapeLeft</string>
 	</array>
-	<key>XSAppIconAssets</key>
-	<string>Assets.xcassets/AppIcon.appiconset</string>
 	<key>UIApplicationSupportsIndirectInputEvents</key>
 	<true/>
 	<key>CADisableMinimumFrameDurationOnPhone</key>
 	<true/>
 </dict>
-</plist>
+</plist>

osu.Game.Rulesets.Taiko.Tests.iOS/Info.plist

@@ -35,11 +35,9 @@
 		<string>UIInterfaceOrientationLandscapeRight</string>
 		<string>UIInterfaceOrientationLandscapeLeft</string>
 	</array>
-	<key>XSAppIconAssets</key>
-	<string>Assets.xcassets/AppIcon.appiconset</string>
 	<key>UIApplicationSupportsIndirectInputEvents</key>
 	<true/>
 	<key>CADisableMinimumFrameDurationOnPhone</key>
 	<true/>
 </dict>
-</plist>
+</plist>

osu.Game.Tests.iOS/Info.plist

@@ -35,8 +35,31 @@
 		<string>UIInterfaceOrientationLandscapeRight</string>
 		<string>UIInterfaceOrientationLandscapeLeft</string>
 	</array>
-	<key>XSAppIconAssets</key>
+    <key>CFBundleIcons~ipad</key>
-	<string>Assets.xcassets/AppIcon.appiconset</string>
+    <dict>
+        <key>CFBundlePrimaryIcon</key>
+        <dict>
+            <key>CFBundleIconFiles</key>
+            <array>
+                <string>AppIcon60x60</string>
+            </array>
+            <key>CFBundleIconName</key>
+            <string>AppIcon</string>
+        </dict>
+    </dict>
+    <key>CFBundleIcons</key>
+    <dict>
+        <key>CFBundlePrimaryIcon</key>
+        <dict>
+            <key>CFBundleIconFiles</key>
+            <array>
+                <string>AppIcon60x60</string>
+                <string>AppIcon76x76</string>
+            </array>
+            <key>CFBundleIconName</key>
+            <string>AppIcon</string>
+        </dict>
+    </dict>
 	<key>UIApplicationSupportsIndirectInputEvents</key>
 	<true/>
 	<key>CADisableMinimumFrameDurationOnPhone</key>

osu.iOS/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -1,14 +0,0 @@
-{
-  "images" : [
-    {
-      "filename" : "300076680-5cbe0121-ed68-414f-9ddc-dd993ac97e62.png",
-      "idiom" : "universal",
-      "platform" : "ios",
-      "size" : "1024x1024"
-    }
-  ],
-  "info" : {
-    "author" : "xcode",
-    "version" : 1
-  }
-}

osu.iOS/Assets.xcassets/Contents.json

@@ -1,6 +0,0 @@
-{
-  "info" : {
-    "version" : 1,
-    "author" : "xcode"
-  }
-}

osu.iOS/Info.plist

@@ -49,8 +49,31 @@
 		<string>UIInterfaceOrientationLandscapeRight</string>
 		<string>UIInterfaceOrientationLandscapeLeft</string>
 	</array>
-	<key>XSAppIconAssets</key>
+    <key>CFBundleIcons~ipad</key>
-	<string>Assets.xcassets/AppIcon.appiconset</string>
+    <dict>
+        <key>CFBundlePrimaryIcon</key>
+        <dict>
+            <key>CFBundleIconFiles</key>
+            <array>
+                <string>AppIcon60x60</string>
+            </array>
+            <key>CFBundleIconName</key>
+            <string>AppIcon</string>
+        </dict>
+    </dict>
+    <key>CFBundleIcons</key>
+    <dict>
+        <key>CFBundlePrimaryIcon</key>
+        <dict>
+            <key>CFBundleIconFiles</key>
+            <array>
+                <string>AppIcon60x60</string>
+                <string>AppIcon76x76</string>
+            </array>
+            <key>CFBundleIconName</key>
+            <string>AppIcon</string>
+        </dict>
+    </dict>
 	<key>UTExportedTypeDeclarations</key>
 	<array>
 		<dict>

osu.iOS/osu.iOS.csproj

@@ -22,6 +22,11 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.Maui.Essentials" Version="8.0.3" />
   </ItemGroup>
+  <ItemGroup>
+    <BundleResource Include="Assets.car" />
+    <BundleResource Include="AppIcon60x60@2x.png" />
+    <BundleResource Include="AppIcon76x76@2x~ipad.png" />
+  </ItemGroup>
   <!-- https://github.com/dotnet/macios/blob/eabcdee2ac43a0cc8324396a1bf75f8797d71810/msbuild/Xamarin.Shared/Xamarin.Shared.targets#L1328 -->
   <Target Name="AddOsuVersionToBundle" AfterTargets="_CreateAppBundle">
     <PropertyGroup>