added a TombstonedAvatarImage view to be used for the .tombstoned case

ElementX/Sources/Other/SwiftUI/Views/TombstonedAvatarImage.swift

@@ -0,0 +1,42 @@
+//
+// Copyright 2025 New Vector Ltd.
+//
+// SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+// Please see LICENSE files in the repository root for full details.
+//
+
+import Compound
+import SwiftUI
+
+struct TombstonedAvatarImage: View {
+    @ScaledMetric private var frameSize: CGFloat
+    
+    init(avatarSize: Avatars.Size) {
+        _frameSize = ScaledMetric(wrappedValue: avatarSize.value)
+    }
+    
+    var body: some View {
+        GeometryReader { geometry in
+            ZStack(alignment: .center) {
+                Color.compound.bgSubtlePrimary
+                
+                Text(verbatim: "!")
+                    .foregroundColor(.compound.iconTertiary)
+                    .font(.system(size: geometry.size.width * 0.5625, weight: .semibold))
+                    .minimumScaleFactor(0.001)
+                    .frame(alignment: .center)
+            }
+        }
+        .aspectRatio(1, contentMode: .fill)
+        .frame(width: frameSize, height: frameSize)
+        .background(Color.compound.bgCanvasDefault)
+        .clipShape(Circle())
+    }
+}
+
+struct TombstonedAvatarImage_Previews: PreviewProvider, TestablePreview {
+    static var previews: some View {
+        TombstonedAvatarImage(avatarSize: .room(on: .home))
+            .previewLayout(.sizeThatFits)
+    }
+}