Use original Classroom logo only on homepage card.

Add a dedicated homepage logo asset and point the Open Classroom main content card to it so sidebar branding remains unchanged.

Made-with: Cursor

classroom_app/Assets.xcassets/HomePageGoogleClassroomLogo.imageset/Contents.json

@@ -0,0 +1,21 @@
+{
+  "images": [
+    {
+      "filename": "icon_google_classroom.png",
+      "idiom": "universal",
+      "scale": "1x"
+    },
+    {
+      "idiom": "universal",
+      "scale": "2x"
+    },
+    {
+      "idiom": "universal",
+      "scale": "3x"
+    }
+  ],
+  "info": {
+    "author": "xcode",
+    "version": 1
+  }
+}

classroom_app/ViewController.swift

@@ -2450,9 +2450,9 @@ private extension ViewController {
         iconWrap.widthAnchor.constraint(equalToConstant: 58).isActive = true
         iconWrap.heightAnchor.constraint(equalToConstant: 58).isActive = true
         iconWrap.layer?.borderWidth = 0
-        let usesClassroomAsset = NSImage(named: "icon_google_classroom") != nil
+        let usesClassroomAsset = NSImage(named: "HomePageGoogleClassroomLogo") != nil
         let classLogoImage =
-            NSImage(named: "icon_google_classroom")
+            NSImage(named: "HomePageGoogleClassroomLogo")
             ?? NSImage(systemSymbolName: "graduationcap.circle.fill", accessibilityDescription: "Google Classroom")
             ?? NSImage()
         classLogoImage.isTemplate = false