Add sunset banners guiding users to install Element X when registering against a server with MAS. (#7890)

RiotSwiftUI/Modules/Authentication/ServerSelection/AuthenticationServerSelectionViewModel.swift

@@ -37,6 +37,8 @@ class AuthenticationServerSelectionViewModel: AuthenticationServerSelectionViewM
             Task { await callback?(.dismiss) }
         case .clearFooterError:
             Task { await clearFooterError() }
+        case .downloadReplacementApp(let replacementApp):
+            Task { await callback?(.downloadReplacementApp(replacementApp)) }
         }
     }
     
@@ -44,10 +46,14 @@ class AuthenticationServerSelectionViewModel: AuthenticationServerSelectionViewM
         switch type {
         case .footerMessage(let message):
             withAnimation {
-                state.footerErrorMessage = message
+                state.footerError = .message(message)
             }
         case .openURLAlert:
             state.bindings.alertInfo = AlertInfo(id: .openURLAlert, title: VectorL10n.roomMessageUnableOpenLinkErrorMessage)
+        case .requiresReplacementApp:
+            withAnimation {
+                state.footerError = .sunsetBanner
+            }
         }
     }
     
@@ -55,7 +61,7 @@ class AuthenticationServerSelectionViewModel: AuthenticationServerSelectionViewM
     
     /// Clear any errors shown in the text field footer.
     @MainActor private func clearFooterError() {
-        guard state.footerErrorMessage != nil else { return }
-        withAnimation { state.footerErrorMessage = nil }
+        guard state.footerError != nil else { return }
+        withAnimation { state.footerError = nil }
     }
 }