Add a SwiftUI iOS app that plays the same maturita content.

Co-authored-by: Cursor <cursoragent@cursor.com>

ios/Maturita/AppModel.swift

@@ -0,0 +1,113 @@
+import Foundation
+import SwiftUI
+
+final class AppModel: ObservableObject {
+    let content = Content.load()
+    let progress = ProgressStore()
+    let updater = Updater()
+
+    @Published var themeId: ThemeId
+    @Published var mode: ColorMode
+    @Published var lang: UiLang
+    @Published var settingsOpen = false
+    @Published var searchOpen = false
+    @Published var searchQuery = ""
+    @Published var tick = 0
+    @Published var update = UpdateState()
+    @Published var stack: [Route] = [.welcome]
+
+    init() {
+        themeId = progress.themeId
+        mode = progress.mode
+        lang = progress.lang
+    }
+
+    var route: Route { stack.last ?? .welcome }
+    var canGoBack: Bool { stack.count > 1 }
+    var palette: Palette { themePalette(themeId, mode) }
+
+    func tr(_ key: String?) -> String { content.tr(key, lang: lang) }
+
+    func fmt(_ key: String, _ args: CVarArg...) -> String {
+        content.fmt(key, lang: lang, args)
+    }
+
+    func go(_ r: Route) {
+        if stack.last == r { return }
+        stack.append(r)
+        searchOpen = false
+    }
+
+    func goPage(_ page: String?) {
+        guard let page, let r = routeFromPage(page) else { return }
+        go(r)
+    }
+
+    func back() {
+        if stack.count > 1 { stack.removeLast() }
+    }
+
+    func setTheme(_ id: ThemeId) {
+        themeId = id
+        progress.themeId = id
+    }
+
+    func applyMode(_ m: ColorMode) {
+        mode = m
+        progress.mode = m
+    }
+
+    func applyLang(_ l: UiLang) {
+        lang = l
+        progress.lang = l
+    }
+
+    func refresh() { tick += 1 }
+
+    func markGerman(_ unit: Int, _ ex: Int) {
+        progress.markGerman(unit, ex)
+        refresh()
+    }
+
+    func markVocab(_ unit: Int) {
+        progress.markVocab(unit)
+        refresh()
+    }
+
+    func markNet(_ id: Int) {
+        progress.markNet(id)
+        refresh()
+    }
+
+    func markHw(_ id: Int) {
+        progress.markHw(id)
+        refresh()
+    }
+
+    func markMluv(_ n: Int) {
+        progress.markMluv(n)
+        refresh()
+    }
+
+    func markBookQuiz(_ id: String) {
+        progress.markBookQuiz(id)
+        refresh()
+    }
+
+    func markBookPlot(_ id: String) {
+        progress.markBookPlot(id)
+        refresh()
+    }
+
+    func checkUpdate(_ interactive: Bool) {
+        updater.check(interactive: interactive) { [weak self] state in
+            self?.update = state
+        }
+    }
+
+    func installUpdate() {
+        updater.install { [weak self] state in
+            self?.update = state
+        }
+    }
+}