feat: center square Hope presence and guide secure certificate setup

Sources/Features/Conversation/LoginView.swift

@@ -38,8 +38,13 @@ struct LoginView: View {
                         }
                     }.disabled(auth.isBusy)
                     if let serverError { Text(serverError).foregroundStyle(.red) }
-                    Text("Connections use HTTPS and secure WebSockets. A private server certificate may require an installed, trusted CA on this iPhone.")
+                    Text("Connections use HTTPS and secure WebSockets. A private server certificate must be trusted by this iPhone for conversations.")
                         .font(.footnote).foregroundStyle(.secondary)
+                    if auth.config.baseURL.host == TLSPinning.host, auth.config.baseURL.port == 9178 {
+                        Link("Install Hope server certificate in Safari", destination: auth.config.baseURL.appendingPathComponent("hope-server.mobileconfig"))
+                        Text("Install Hope LAN Server Trust in Settings → General → VPN & Device Management. Then enable 192.168.86.2 in Settings → General → About → Certificate Trust Settings. Only trust this certificate for your own server.")
+                            .font(.footnote).foregroundStyle(.secondary)
+                    }
                 }
             }
             .navigationTitle("Hope")