Support for ongoing voice vs video call + joining (#5399)

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

@@ -10,8 +10,9 @@ import Compound
 import SwiftUI
 
 struct JoinCallButton: View {
+    let isVoiceCall: Bool
     let action: () -> Void
-    
+
     var body: some View {
         if #available(iOS 26, *) {
             glassButton
@@ -25,7 +26,7 @@ struct JoinCallButton: View {
             // Use an HStack on iOS 26 as .labelStyle(.titleAndIcon) doesn't
             // seem to have any effect on a label in the navigation bar 🤷‍♂️
             HStack(spacing: 6) {
-                CompoundIcon(\.videoCallSolid)
+                CompoundIcon(isVoiceCall ? \.voiceCallSolid : \.videoCallSolid)
                 Text(L10n.actionJoin)
                     .padding(.trailing, 4)
             }
@@ -66,9 +67,20 @@ struct JoinCallButton_Previews: PreviewProvider {
             Color.clear
                 .toolbar {
                     ToolbarItem(placement: .confirmationAction) {
-                        JoinCallButton { }
+                        JoinCallButton(isVoiceCall: false) { }
                     }
                 }
         }
+        .previewDisplayName("Join Video Call")
+        
+        ElementNavigationStack {
+            Color.clear
+                .toolbar {
+                    ToolbarItem(placement: .confirmationAction) {
+                        JoinCallButton(isVoiceCall: true) { }
+                    }
+                }
+        }
+        .previewDisplayName("Join Audio Call")
     }
 }