Show a what's-new card on the home screen after each update.

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

ios/Maturita/AppModel.swift

@@ -14,11 +14,13 @@ final class AppModel: ObservableObject {
     @Published var searchQuery = ""
     @Published var tick = 0
     @Published var update = UpdateState()
+    @Published var showChangelog = false
 
     init() {
         themeId = progress.themeId
         mode = progress.mode
         lang = progress.lang
+        showChangelog = !content.changelog.isEmpty && !sameBuild(AppConfig.commit, progress.seenCommit)
         #if DEBUG
         // `xcrun simctl launch <udid> org.maturita.maturita -route u1e3` opens a page for screenshots.
         if let page = UserDefaults.standard.string(forKey: "route"), let r = routeFromPage(page) {
@@ -141,4 +143,16 @@ final class AppModel: ObservableObject {
             self?.update = state
         }
     }
+
+    func dismissChangelog() {
+        progress.seenCommit = AppConfig.commit
+        showChangelog = false
+    }
+}
+
+func sameBuild(_ a: String?, _ b: String?) -> Bool {
+    guard let a, let b, !a.isEmpty, !b.isEmpty else { return false }
+    if a.caseInsensitiveCompare(b) == .orderedSame { return true }
+    let n = min(a.count, b.count)
+    return n >= 7 && a.prefix(n).caseInsensitiveCompare(b.prefix(n)) == .orderedSame
 }

ios/Maturita/Data/Content.swift

@@ -33,6 +33,7 @@ final class Content {
     let hw: [J]
     let mluvnice: [J]
     let books: [J]
+    let changelog: [J]
 
     init(_ root: [String: Any]) {
         raw = J(root)
@@ -63,6 +64,7 @@ final class Content {
         hw = raw.arr("hw")
         mluvnice = raw.arr("mluvnice")
         books = raw.arr("books")
+        changelog = raw.arr("changelog")
     }
 
     func germanUnit(_ id: Int) -> J? { german.first { $0.int("id") == id } }

ios/Maturita/Data/ProgressStore.swift

@@ -18,6 +18,11 @@ final class ProgressStore {
         set { defaults.set(newValue == .en ? "en" : "cs", forKey: "lang") }
     }
 
+    var seenCommit: String {
+        get { defaults.string(forKey: "seen_commit") ?? "" }
+        set { defaults.set(newValue, forKey: "seen_commit") }
+    }
+
     func germanDone(_ unit: Int, _ ex: Int) -> Bool { defaults.bool(forKey: "g.\(unit).\(ex)") }
     func markGerman(_ unit: Int, _ ex: Int) { defaults.set(true, forKey: "g.\(unit).\(ex)") }
     func vocabDone(_ unit: Int) -> Bool { defaults.bool(forKey: "g.\(unit).vocab") }

ios/Maturita/UI/Screens.swift

@@ -7,6 +7,14 @@ struct PracticeHome: View {
         let sum = summarize(vm.content, vm.progress)
         let pct = sum.totalEx == 0 ? 0 : Double(sum.doneEx) / Double(sum.totalEx)
         List {
+            if vm.showChangelog {
+                Section {
+                    ChangelogCard(vm: vm)
+                        .listRowInsets(EdgeInsets(top: 8, leading: 16, bottom: 8, trailing: 16))
+                        .listRowBackground(Color.clear)
+                        .listRowSeparator(.hidden)
+                }
+            }
             Section {
                 GlassCard {
                     VStack(alignment: .leading, spacing: 10) {
@@ -59,6 +67,55 @@ struct PracticeHome: View {
     }
 }
 
+struct ChangelogCard: View {
+    @ObservedObject var vm: AppModel
+
+    var body: some View {
+        let langKey = vm.lang == .en ? "en" : "cs"
+        let blocks = Array(vm.content.changelog.prefix(3))
+        GlassCard {
+            VStack(alignment: .leading, spacing: 10) {
+                HStack {
+                    Label(vm.tr("changelog_title"), systemImage: "sparkles")
+                        .font(.headline)
+                    Spacer()
+                    if let date = blocks.first?.strOrNull("date") {
+                        Text(date)
+                            .font(.caption.weight(.semibold))
+                            .foregroundStyle(.secondary)
+                    }
+                }
+                ForEach(Array(blocks.enumerated()), id: \.offset) { index, block in
+                    ChangelogLines(index: index, lines: changelogLines(block, langKey))
+                }
+                Button(vm.tr("changelog_dismiss")) { vm.dismissChangelog() }
+                    .buttonStyle(.borderedProminent)
+                    .controlSize(.small)
+            }
+        }
+    }
+}
+
+private func changelogLines(_ block: J, _ langKey: String) -> [String] {
+    let preferred = block.strs(langKey)
+    return preferred.isEmpty ? block.strs("cs") : preferred
+}
+
+private struct ChangelogLines: View {
+    let index: Int
+    let lines: [String]
+
+    var body: some View {
+        VStack(alignment: .leading, spacing: 4) {
+            if index > 0 { Spacer().frame(height: 4) }
+            ForEach(Array(lines.enumerated()), id: \.offset) { _, line in
+                Text("•  \(line)")
+                    .font(.subheadline)
+            }
+        }
+    }
+}
+
 struct SettingsScreen: View {
     @ObservedObject var vm: AppModel