Add support for homeserver capabilities to disable the UserDetailsEditScreen UI. (#5421)

Add support for homeserver capabilities to disable editing your user profile.

Also updates editable avatar size/formatting to match the latest Figma at the same time.

ElementX/Sources/Services/Capabilities/HomeserverCapabilitiesProxy.swift

@@ -0,0 +1,43 @@
+//
+// Copyright 2026 Element Creations Ltd.
+//
+// SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial.
+// Please see LICENSE files in the repository root for full details.
+//
+
+import Foundation
+import MatrixRustSDK
+
+struct HomeserverCapabilitiesProxy: HomeserverCapabilitiesProxyProtocol {
+    private let underlyingCapabilities: HomeserverCapabilitiesProtocol
+    
+    init(underlyingCapabilities: HomeserverCapabilitiesProtocol) {
+        self.underlyingCapabilities = underlyingCapabilities
+    }
+    
+    func refresh() async {
+        do {
+            try await underlyingCapabilities.refresh()
+        } catch {
+            MXLog.error("Failure refreshing homeserver capabilities: \(error)")
+        }
+    }
+    
+    func canChangeAvatar() async -> Bool {
+        do {
+            return try await underlyingCapabilities.canChangeAvatar()
+        } catch {
+            MXLog.error("Failure checking canChangeAvatar: \(error)")
+            return true
+        }
+    }
+    
+    func canChangeDisplayName() async -> Bool {
+        do {
+            return try await underlyingCapabilities.canChangeDisplayname()
+        } catch {
+            MXLog.error("Failure checking canChangeDisplayName: \(error)")
+            return true
+        }
+    }
+}

ElementX/Sources/Services/Capabilities/HomeserverCapabilitiesProxyProtocol.swift

@@ -0,0 +1,15 @@
+//
+// Copyright 2026 Element Creations Ltd.
+//
+// SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial.
+// Please see LICENSE files in the repository root for full details.
+//
+
+import Foundation
+
+// sourcery: AutoMockable
+protocol HomeserverCapabilitiesProxyProtocol {
+    func refresh() async
+    func canChangeAvatar() async -> Bool
+    func canChangeDisplayName() async -> Bool
+}