feat(ios): implement SwiftUI companion with isolated WKWebView sessions

Add HTTPS onboarding, origin policy, native recovery/settings, isolated web sign-in and file export. Portable production URL policy tests pass on Linux; all Swift sources parse. Xcode build and simulator validation remain required on macOS.

ios/Sources/AuthenticationView.swift

@@ -0,0 +1,57 @@
+import SwiftUI
+import WebKit
+
+struct AuthenticationView: View {
+    let destination: URL
+    @ObservedObject var model: BrowserModel
+    var body: some View {
+        NavigationStack {
+            IsolatedAuthentication(url: destination, model: model)
+                .navigationTitle("Isolated web sign-in")
+                .navigationBarTitleDisplayMode(.inline)
+                .toolbar { Button("Close") { model.authentication = nil } }
+        }
+    }
+}
+
+struct IsolatedAuthentication: UIViewRepresentable {
+    let url: URL
+    let model: BrowserModel
+    func makeCoordinator() -> Coordinator { Coordinator(model) }
+    func makeUIView(context: Context) -> WKWebView {
+        let configuration = WKWebViewConfiguration()
+        // Same cookie store as the initiating Yuvomi handshake; no manual cookie export.
+        configuration.websiteDataStore = model.web.configuration.websiteDataStore
+        configuration.preferences.javaScriptCanOpenWindowsAutomatically = false
+        configuration.mediaTypesRequiringUserActionForPlayback = .all
+        let view = WKWebView(frame: .zero, configuration: configuration)
+        view.navigationDelegate = context.coordinator
+        view.uiDelegate = context.coordinator
+        if #available(iOS 16.4, *) { view.isInspectable = false }
+        view.load(URLRequest(url: url))
+        return view
+    }
+    func updateUIView(_ uiView: WKWebView, context: Context) {}
+    static func dismantleUIView(_ uiView: WKWebView, coordinator: Coordinator) {
+        uiView.stopLoading(); uiView.navigationDelegate = nil; uiView.uiDelegate = nil
+    }
+    final class Coordinator: NSObject, WKNavigationDelegate, WKUIDelegate {
+        let model: BrowserModel
+        init(_ model: BrowserModel) { self.model = model }
+        func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction,
+                     decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {
+            guard let url = navigationAction.request.url, url.scheme == "https",
+                  url.user == nil, url.password == nil else { decisionHandler(.cancel); return }
+            decisionHandler(.allow)
+        }
+        func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
+            if let url = webView.url, model.server?.owns(url) == true, !url.path.hasPrefix("/api/") {
+                model.authentication = nil
+                model.web.load(URLRequest(url: url))
+            }
+        }
+        func webView(_ webView: WKWebView, requestMediaCapturePermissionFor origin: WKSecurityOrigin,
+                     initiatedByFrame frame: WKFrameInfo, type: WKMediaCaptureType,
+                     decisionHandler: @escaping (WKPermissionDecision) -> Void) { decisionHandler(.deny) }
+    }
+}

ios/Sources/BrowserModel.swift

@@ -0,0 +1,248 @@
+import SwiftUI
+import WebKit
+
+struct WebDestination: Identifiable {
+    let id = UUID()
+    let url: URL
+}
+
+@MainActor
+final class BrowserModel: NSObject, ObservableObject, WKNavigationDelegate, WKUIDelegate, WKDownloadDelegate {
+    @Published var loading = false
+    @Published var canGoBack = false
+    @Published var error: String?
+    @Published var externalURL: URL?
+    @Published var authentication: WebDestination?
+    @Published var download: WebDestination?
+    private(set) var server: ServerAddress?
+    private(set) var web: WKWebView
+    private var observations: [NSKeyValueObservation] = []
+    private var deadline: Timer?
+    private var activeDownload: WKDownload?
+    private var downloadLocation: URL?
+
+    override init() {
+        web = Self.makeWebView()
+        super.init()
+        configureWebView()
+        // Only app-owned temporary exports are removed, never user-saved documents.
+        let folder = Self.exportDirectory
+        try? FileManager.default.removeItem(at: folder)
+    }
+
+    private static func makeWebView() -> WKWebView {
+        let configuration = WKWebViewConfiguration()
+        configuration.websiteDataStore = .default()
+        configuration.preferences.javaScriptCanOpenWindowsAutomatically = false
+        configuration.allowsInlineMediaPlayback = true
+        configuration.mediaTypesRequiringUserActionForPlayback = .all
+        return WKWebView(frame: .zero, configuration: configuration)
+    }
+
+    private func configureWebView() {
+        web.navigationDelegate = self
+        web.uiDelegate = self
+        web.allowsBackForwardNavigationGestures = true
+        web.isOpaque = false
+        if #available(iOS 16.4, *) { web.isInspectable = false }
+        observations.append(web.observe(\.canGoBack, options: [.new]) { [weak self] view, _ in
+            self?.canGoBack = view.canGoBack
+        })
+    }
+
+    static var exportDirectory: URL {
+        FileManager.default.temporaryDirectory.appendingPathComponent("YuvomiExports", isDirectory: true)
+    }
+
+    func open(_ server: ServerAddress) {
+        self.server = server
+        let path = UserDefaults.standard.string(forKey: "path") ?? "/"
+        let restored = URL(string: path, relativeTo: server.url)?.absoluteURL
+        let url = restored.flatMap { server.owns($0) ? $0 : nil } ?? server.url
+        web.load(URLRequest(url: url))
+    }
+
+    func rememberPath() {
+        guard let url = web.url, server?.owns(url) == true else { return }
+        let path = url.path
+        guard !["auth", "reset", "invite", "login"].contains(where: { path.localizedCaseInsensitiveContains($0) }) else { return }
+        UserDefaults.standard.set(path, forKey: "path")
+    }
+
+    func erase(completion: @escaping () -> Void) {
+        deadline?.invalidate()
+        web.stopLoading()
+        activeDownload?.cancel { _ in }
+        activeDownload = nil
+        authentication = nil
+        removeDownload()
+        server = nil
+        web.navigationDelegate = nil
+        web.uiDelegate = nil
+        observations.removeAll()
+        WKWebsiteDataStore.default().removeData(ofTypes: WKWebsiteDataStore.allWebsiteDataTypes(),
+                                               modifiedSince: .distantPast) { [weak self] in
+            guard let self else { return }
+            self.web = Self.makeWebView()
+            self.configureWebView()
+            self.canGoBack = false; self.loading = false; self.error = nil
+            completion()
+        }
+    }
+
+    func startAuthentication(_ url: URL) {
+        guard url.scheme == "https", url.user == nil, url.password == nil else { return }
+        authentication = WebDestination(url: url)
+    }
+
+    func removeDownload() {
+        download = nil
+        if let location = downloadLocation { try? FileManager.default.removeItem(at: location.deletingLastPathComponent()) }
+        downloadLocation = nil
+    }
+
+    func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction,
+                 decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {
+        guard let url = navigationAction.request.url else { decisionHandler(.cancel); return }
+        if server?.owns(url) == true {
+            decisionHandler(navigationAction.shouldPerformDownload ? .download : .allow)
+        } else {
+            decisionHandler(.cancel)
+            if navigationAction.targetFrame?.isMainFrame != false {
+                if url.scheme == "https", url.host != nil, url.user == nil, url.password == nil {
+                    externalURL = url
+                } else { error = "This link type is blocked for your security." }
+            }
+        }
+    }
+
+    func webView(_ webView: WKWebView, decidePolicyFor navigationResponse: WKNavigationResponse,
+                 decisionHandler: @escaping (WKNavigationResponsePolicy) -> Void) {
+        if let response = navigationResponse.response as? HTTPURLResponse,
+           navigationResponse.isForMainFrame, response.statusCode >= 400 {
+            error = "The server is unavailable (HTTP \(response.statusCode))."
+        }
+        guard let url = navigationResponse.response.url, server?.owns(url) == true else {
+            decisionHandler(.cancel); return
+        }
+        if !navigationResponse.canShowMIMEType {
+            guard navigationResponse.response.expectedContentLength <= 100 * 1024 * 1024 else {
+                error = "This file exceeds the 100 MB download limit."
+                decisionHandler(.cancel); return
+            }
+            decisionHandler(.download)
+        } else { decisionHandler(.allow) }
+    }
+
+    func webView(_ webView: WKWebView, didStartProvisionalNavigation navigation: WKNavigation!) {
+        loading = true
+        deadline?.invalidate()
+        deadline = Timer.scheduledTimer(withTimeInterval: 30, repeats: false) { [weak self] _ in
+            Task { @MainActor in
+                self?.loading = false
+                self?.error = "The server is taking too long. Check your connection or try again."
+            }
+        }
+    }
+
+    func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
+        loading = false; deadline?.invalidate(); rememberPath()
+    }
+    func webView(_ webView: WKWebView, didFail navigation: WKNavigation!, withError error: Error) { failed(error) }
+    func webView(_ webView: WKWebView, didFailProvisionalNavigation navigation: WKNavigation!, withError error: Error) { failed(error) }
+    private func failed(_ failure: Error) {
+        loading = false; deadline?.invalidate()
+        guard (failure as NSError).code != NSURLErrorCancelled else { return }
+        error = "Unable to connect securely. Check your network, VPN and server certificate. Cached pages may still be available."
+    }
+    func webViewWebContentProcessDidTerminate(_ webView: WKWebView) {
+        error = "Yuvomi's browser was interrupted. Tap Retry to restore the page."
+        loading = false
+    }
+    func webView(_ webView: WKWebView, createWebViewWith configuration: WKWebViewConfiguration,
+                 for navigationAction: WKNavigationAction, windowFeatures: WKWindowFeatures) -> WKWebView? {
+        if let url = navigationAction.request.url {
+            if server?.owns(url) == true { web.load(navigationAction.request) }
+            else if url.scheme == "https", url.user == nil, url.password == nil { externalURL = url }
+        }
+        return nil
+    }
+    func webView(_ webView: WKWebView, requestMediaCapturePermissionFor origin: WKSecurityOrigin,
+                 initiatedByFrame frame: WKFrameInfo, type: WKMediaCaptureType,
+                 decisionHandler: @escaping (WKPermissionDecision) -> Void) {
+        // File input capture uses Apple's picker. Live camera/microphone access is not required by upstream.
+        decisionHandler(.deny)
+    }
+    func webView(_ webView: WKWebView, navigationAction: WKNavigationAction, didBecome download: WKDownload) {
+        attach(download)
+    }
+    func webView(_ webView: WKWebView, navigationResponse: WKNavigationResponse, didBecome download: WKDownload) {
+        attach(download)
+    }
+    private func attach(_ download: WKDownload) {
+        guard activeDownload == nil, self.download == nil else {
+            download.cancel { _ in }; error = "Finish the current download before starting another."; return
+        }
+        activeDownload = download; download.delegate = self
+    }
+    func download(_ download: WKDownload, decideDestinationUsing response: URLResponse,
+                  suggestedFilename: String, completionHandler: @escaping (URL?) -> Void) {
+        guard let url = response.url, server?.owns(url) == true,
+              response.expectedContentLength <= 100 * 1024 * 1024 else { completionHandler(nil); return }
+        do {
+            let folder = Self.exportDirectory.appendingPathComponent(UUID().uuidString, isDirectory: true)
+            try FileManager.default.createDirectory(at: folder, withIntermediateDirectories: true,
+                attributes: [.protectionKey: FileProtectionType.completeUntilFirstUserAuthentication])
+            var values = URLResourceValues(); values.isExcludedFromBackup = true
+            var directory = folder; try directory.setResourceValues(values)
+            let name = String(suggestedFilename.map { $0.isLetter || $0.isNumber || "._ -".contains($0) ? $0 : "_" }.prefix(120))
+            let safeName = name.isEmpty || name == "." || name == ".." ? "download" : name
+            downloadLocation = folder.appendingPathComponent(safeName)
+            completionHandler(downloadLocation)
+        } catch { completionHandler(nil); self.error = "Could not prepare the download." }
+    }
+    func download(_ download: WKDownload, willPerformHTTPRedirection response: HTTPURLResponse,
+                  newRequest request: URLRequest, decisionHandler: @escaping (WKDownload.RedirectPolicy) -> Void) {
+        // Do not replay session credentials to a redirect target.
+        decisionHandler(.cancel)
+    }
+    func downloadDidFinish(_ download: WKDownload) {
+        guard activeDownload === download else { return }
+        activeDownload = nil
+        guard let location = downloadLocation,
+              let size = try? location.resourceValues(forKeys: [.fileSizeKey]).fileSize,
+              size <= 100 * 1024 * 1024 else {
+            removeDownload(); error = "Download exceeded the size limit."; return
+        }
+        self.download = WebDestination(url: location)
+    }
+    func download(_ download: WKDownload, didFailWithError error: Error, resumeData: Data?) {
+        guard activeDownload === download else { return }
+        activeDownload = nil; removeDownload()
+        self.error = "Download failed. Check your connection and sign-in, then retry."
+    }
+}
+
+struct BrowserView: UIViewRepresentable {
+    @ObservedObject var model: BrowserModel
+    func makeUIView(context: Context) -> WKWebView { model.web }
+    func updateUIView(_ uiView: WKWebView, context: Context) {}
+}
+
+struct ExportView: UIViewControllerRepresentable {
+    let url: URL
+    let completion: () -> Void
+    func makeUIViewController(context: Context) -> UIDocumentPickerViewController {
+        let picker = UIDocumentPickerViewController(forExporting: [url], asCopy: true)
+        picker.delegate = context.coordinator
+        return picker
+    }
+    func updateUIViewController(_ uiViewController: UIDocumentPickerViewController, context: Context) {}
+    func makeCoordinator() -> Coordinator { Coordinator(completion) }
+    final class Coordinator: NSObject, UIDocumentPickerDelegate {
+        let completion: () -> Void
+        init(_ completion: @escaping () -> Void) { self.completion = completion }
+        func documentPickerWasCancelled(_ controller: UIDocumentPickerViewController) { completion() }
+        func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentsAt urls: [URL]) { completion() }
+    }
+}

ios/Sources/ContentView.swift

@@ -0,0 +1,144 @@
+import SwiftUI
+import WebKit
+
+struct ContentView: View {
+    @StateObject private var browser = BrowserModel()
+    @State private var input = UserDefaults.standard.string(forKey: "origin") ?? ""
+    @State private var server: ServerAddress?
+    @State private var connecting = false
+    @State private var message: String?
+    @State private var settings = false
+    @State private var erasing = false
+    @Environment(\.scenePhase) private var scenePhase
+
+    var body: some View {
+        NavigationStack {
+            Group {
+                if server != nil {
+                    ZStack {
+                        BrowserView(model: browser)
+                        if let error = browser.error {
+                            VStack(spacing: 18) {
+                                Image(systemName: "wifi.exclamationmark").font(.largeTitle)
+                                Text("Connection interrupted").font(.title2).bold()
+                                Text(error)
+                                Button("Retry") { browser.error = nil; browser.web.reload() }
+                                Button("Keep viewing") { browser.error = nil }
+                                Button("Server settings") { settings = true }
+                            }
+                            .padding(24).frame(maxWidth: .infinity, maxHeight: .infinity)
+                            .background(Color(uiColor: .systemGroupedBackground))
+                            .accessibilityElement(children: .contain)
+                        }
+                        if browser.loading { ProgressView("Loading Yuvomi").padding().background(.regularMaterial).cornerRadius(12) }
+                    }
+                    .toolbar {
+                        ToolbarItem(placement: .navigationBarLeading) {
+                            Button { browser.web.goBack() } label: { Image(systemName: "chevron.backward") }
+                                .disabled(!browser.canGoBack).accessibilityLabel("Back")
+                        }
+                        ToolbarItem(placement: .navigationBarTrailing) {
+                            Button("Server settings") { settings = true }
+                        }
+                    }
+                } else {
+                    ScrollView {
+                        VStack(alignment: .leading, spacing: 20) {
+                            Image(systemName: "house.fill").font(.system(size: 48)).foregroundStyle(.tint)
+                                .accessibilityHidden(true)
+                            Text("Your home, connected").font(.largeTitle).bold()
+                            Text("Connect to your own Yuvomi server. Your data stays with your household.")
+                            TextField("https://family.example.com", text: $input)
+                                .keyboardType(.URL).textContentType(.URL)
+                                .textInputAutocapitalization(.never).autocorrectionDisabled()
+                                .textFieldStyle(.roundedBorder).accessibilityLabel("Yuvomi server URL")
+                            Text("HTTPS required. Custom ports supported. Use a dedicated hostname, not a subpath.")
+                                .font(.callout).foregroundStyle(.secondary)
+                            if let message { Text(message).accessibilityIdentifier("connectionError") }
+                            if connecting { ProgressView("Checking your server") }
+                            Button("Connect securely") { connect() }
+                                .buttonStyle(.borderedProminent).disabled(connecting || erasing)
+                                .frame(minHeight: 48)
+                            Text("Independent community app. No telemetry or mandatory cloud service.")
+                                .font(.footnote).foregroundStyle(.secondary)
+                        }.padding(24)
+                    }.background(Color(uiColor: .systemGroupedBackground))
+                }
+            }
+            .navigationTitle("Yuvomi Mobile").navigationBarTitleDisplayMode(.inline)
+            .tint(Color(red: 108 / 255, green: 58 / 255, blue: 237 / 255))
+        }
+        .task {
+            if server == nil, let existing = try? ServerAddress(input) {
+                server = existing; browser.open(existing)
+            }
+        }
+        .onChange(of: scenePhase) { phase in
+            if phase == .background { browser.rememberPath() }
+        }
+        .overlay {
+            if scenePhase != .active {
+                Color(uiColor: .systemBackground).ignoresSafeArea()
+                    .overlay(Text("Yuvomi Mobile").font(.title).bold())
+            }
+        }
+        .sheet(isPresented: $settings) {
+            NavigationStack {
+                Form {
+                    Section("Your server") {
+                        Text(server?.url.absoluteString ?? "")
+                        if let url = server?.url {
+                            ShareLink("Share server address", item: url)
+                            Link("Open server in system browser", destination: url)
+                        }
+                    }
+                    Section {
+                        Text("Changing servers erases cookies, storage and cached household data. Exported files remain. Sign out in Yuvomi first to revoke the server session.")
+                        Button("Erase local data and change server", role: .destructive) {
+                            settings = false; erasing = true
+                            browser.erase {
+                                UserDefaults.standard.removeObject(forKey: "origin")
+                                UserDefaults.standard.removeObject(forKey: "path")
+                                server = nil; input = ""; erasing = false
+                            }
+                        }
+                    }
+                    Section("About") {
+                        Text("Independent community contribution. MIT licensed. Not endorsed by upstream Yuvomi. No mobile telemetry. Your server's own privacy settings still apply.")
+                    }
+                }.navigationTitle("Server settings")
+                    .toolbar { Button("Done") { settings = false } }
+            }
+        }
+        .alert("External destination", isPresented: Binding(
+            get: { browser.externalURL != nil }, set: { if !$0 { browser.externalURL = nil } }
+        ), presenting: browser.externalURL) { url in
+            Button("Open in browser") { UIApplication.shared.open(url); browser.externalURL = nil }
+            Button("Isolated sign-in window") { browser.startAuthentication(url); browser.externalURL = nil }
+            Button("Cancel", role: .cancel) { browser.externalURL = nil }
+        } message: { url in
+            Text("Destination: \(url.host ?? "")\nFor SSO, use the isolated window only if you trust this provider. Browser sessions do not transfer into the app.")
+        }
+        .sheet(item: $browser.authentication) { destination in
+            AuthenticationView(destination: destination.url, model: browser)
+        }
+        .sheet(item: $browser.download) { file in
+            ExportView(url: file.url) { browser.removeDownload() }
+        }
+    }
+
+    private func connect() {
+        do {
+            let candidate = try ServerAddress(input)
+            connecting = true; message = nil
+            Task { @MainActor in
+                defer { connecting = false }
+                do {
+                    try await ServerProbe.check(candidate)
+                    UserDefaults.standard.set(candidate.url.absoluteString, forKey: "origin")
+                    server = candidate; browser.open(candidate)
+                } catch { message = ConnectionError.unavailable.localizedDescription }
+            }
+        } catch { message = ConnectionError.invalidAddress.localizedDescription }
+    }
+}

ios/Sources/PrivacyInfo.xcprivacy

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0"><dict>
+    <key>NSPrivacyTracking</key><false/>
+    <key>NSPrivacyTrackingDomains</key><array/>
+    <key>NSPrivacyCollectedDataTypes</key><array/>
+    <key>NSPrivacyAccessedAPITypes</key><array>
+        <dict><key>NSPrivacyAccessedAPIType</key><string>NSPrivacyAccessedAPICategoryUserDefaults</string>
+        <key>NSPrivacyAccessedAPITypeReasons</key><array><string>CA92.1</string></array></dict>
+    </array>
+</dict></plist>

ios/Sources/ServerAddress.swift

@@ -0,0 +1,47 @@
+import Foundation
+
+struct ServerAddress: Equatable {
+    let url: URL
+
+    init(_ input: String) throws {
+        let value = input.trimmingCharacters(in: .whitespacesAndNewlines)
+        guard !value.contains("\\"), !value.contains(where: { $0.isWhitespace }),
+              var parts = URLComponents(string: value),
+              parts.scheme?.lowercased() == "https",
+              let host = parts.host, !host.isEmpty,
+              parts.user == nil, parts.password == nil,
+              parts.query == nil, parts.fragment == nil,
+              parts.percentEncodedPath.isEmpty || parts.percentEncodedPath == "/",
+              parts.port == nil || (1...65535).contains(parts.port!) else {
+            throw ConnectionError.invalidAddress
+        }
+        parts.scheme = "https"
+        parts.host = host.lowercased()
+        parts.path = ""
+        if parts.port == 443 { parts.port = nil }
+        guard let url = parts.url else { throw ConnectionError.invalidAddress }
+        self.url = url
+    }
+
+    func owns(_ candidate: URL) -> Bool {
+        guard let parts = URLComponents(url: candidate, resolvingAgainstBaseURL: false),
+              let own = URLComponents(url: url, resolvingAgainstBaseURL: false) else { return false }
+        return parts.scheme?.lowercased() == "https" && parts.user == nil && parts.password == nil
+            && parts.host?.lowercased() == own.host?.lowercased()
+            && (parts.port ?? 443) == (own.port ?? 443)
+    }
+}
+
+enum ConnectionError: LocalizedError {
+    case invalidAddress, incompatible, unavailable
+    var errorDescription: String? {
+        switch self {
+        case .invalidAddress:
+            return "Use a root HTTPS URL with a valid host and port. Remove credentials, subpaths, query and fragment."
+        case .incompatible:
+            return "This server does not expose compatible Yuvomi metadata."
+        case .unavailable:
+            return "Cannot verify the server. Check its certificate, VPN, network and reverse proxy."
+        }
+    }
+}

ios/Sources/ServerProbe.swift

@@ -0,0 +1,46 @@
+import Foundation
+
+final class NoRedirect: NSObject, URLSessionTaskDelegate {
+    func urlSession(_ session: URLSession, task: URLSessionTask,
+                    willPerformHTTPRedirection response: HTTPURLResponse,
+                    newRequest request: URLRequest,
+                    completionHandler: @escaping (URLRequest?) -> Void) {
+        completionHandler(nil)
+    }
+}
+
+enum ServerProbe {
+    static func check(_ server: ServerAddress) async throws {
+        let configuration = URLSessionConfiguration.ephemeral
+        configuration.httpCookieStorage = nil
+        configuration.urlCache = nil
+        configuration.timeoutIntervalForRequest = 10
+        configuration.timeoutIntervalForResource = 20
+        let session = URLSession(configuration: configuration, delegate: NoRedirect(), delegateQueue: nil)
+        defer { session.invalidateAndCancel() }
+        let version = try await json(session, server.url.appendingPathComponent("api/v1/version"))
+        guard version["app_name"] is String,
+              version["setup_required"] is Bool,
+              version["password_reset_enabled"] is Bool else { throw ConnectionError.incompatible }
+        let auth = try await json(session, server.url.appendingPathComponent("api/v1/auth/oidc/config"))
+        guard auth["enabled"] is Bool, auth["password_login_enabled"] is Bool else {
+            throw ConnectionError.incompatible
+        }
+    }
+
+    private static func json(_ session: URLSession, _ url: URL) async throws -> [String: Any] {
+        var request = URLRequest(url: url)
+        request.setValue("application/json", forHTTPHeaderField: "Accept")
+        let (stream, response) = try await session.bytes(for: request)
+        guard (response as? HTTPURLResponse)?.statusCode == 200 else { throw ConnectionError.unavailable }
+        var data = Data()
+        for try await byte in stream {
+            guard data.count < 65_536 else { throw ConnectionError.incompatible }
+            data.append(byte)
+        }
+        guard let result = try JSONSerialization.jsonObject(with: data) as? [String: Any] else {
+            throw ConnectionError.incompatible
+        }
+        return result
+    }
+}

ios/Sources/YuvomiApp.swift

@@ -0,0 +1,8 @@
+import SwiftUI
+
+@main
+struct YuvomiApp: App {
+    var body: some Scene {
+        WindowGroup { ContentView() }
+    }
+}