Fix Mac crash when opening a book from search.

Defer NavigationStack path updates until after the practice tab is active so SwiftUI does not trap in boundPathChange.

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

ios/Maturita/AppModel.swift

@@ -51,13 +51,7 @@ final class AppModel: ObservableObject {
             tab = .practice
             practicePath = []
         default:
-            tab = .practice
-            if practicePath.last == r { return }
-            if practicePath.isEmpty {
-                practicePath = r.stack
-            } else {
-                practicePath.append(r)
-            }
+            applyPracticeRoute(r, replace: practicePath.isEmpty)
         }
     }
 
@@ -75,8 +69,25 @@ final class AppModel: ObservableObject {
             tab = .practice
             practicePath = []
         default:
-            tab = .practice
-            practicePath = r.stack
+            // Switching tabs and assigning a deep NavigationStack path in the
+            // same turn crashes SwiftUI on macOS (boundPathChange / unexpectedError).
+            applyPracticeRoute(r, replace: true)
+        }
+    }
+
+    /// Sets the practice tab path safely, especially when jumping from Search.
+    private func applyPracticeRoute(_ r: Route, replace: Bool) {
+        let stack = replace ? r.stack : (practicePath + [r])
+        if !replace, practicePath.last == r { return }
+        let switching = tab != .practice
+        tab = .practice
+        if switching || replace {
+            practicePath = []
+            DispatchQueue.main.async { [weak self] in
+                self?.practicePath = stack
+            }
+        } else {
+            practicePath = stack
         }
     }
 

ios/Maturita/Route.swift

@@ -54,8 +54,14 @@ enum Route: Hashable {
             if id == "1984" { return "cetba1984" }
             if id == "fuks" { return "cetbaFuks" }
             return "cetba_" + id.replacingOccurrences(of: "-", with: "_")
-        case .bookQuiz(let id): return id == "1984" ? "cetba1984quiz" : "cetbaFuksQuiz"
-        case .bookPlot(let id): return id == "1984" ? "cetba1984dej" : "cetbaFuksDej"
+        case .bookQuiz(let id):
+            if id == "1984" { return "cetba1984quiz" }
+            if id == "fuks" { return "cetbaFuksQuiz" }
+            return "cetba_" + id.replacingOccurrences(of: "-", with: "_") + "_quiz"
+        case .bookPlot(let id):
+            if id == "1984" { return "cetba1984dej" }
+            if id == "fuks" { return "cetbaFuksDej" }
+            return "cetba_" + id.replacingOccurrences(of: "-", with: "_") + "_dej"
         }
     }
 
@@ -123,6 +129,14 @@ func routeFromPage(_ page: String) -> Route? {
     case "cetbaFuksQuiz": return .bookQuiz("fuks")
     case "cetbaFuksDej": return .bookPlot("fuks")
     default:
+        if page.hasPrefix("cetba_"), page.hasSuffix("_quiz") {
+            let slug = String(page.dropFirst(6).dropLast(5)).replacingOccurrences(of: "_", with: "-")
+            return .bookQuiz(slug)
+        }
+        if page.hasPrefix("cetba_"), page.hasSuffix("_dej") {
+            let slug = String(page.dropFirst(6).dropLast(4)).replacingOccurrences(of: "_", with: "-")
+            return .bookPlot(slug)
+        }
         if page.hasPrefix("cetba_") {
             let slug = String(page.dropFirst(6)).replacingOccurrences(of: "_", with: "-")
             return .book(slug)

ios/Maturita/UI/Screens.swift

@@ -939,7 +939,7 @@ struct BookScreen: View {
                 }
                 ForEach(Array(b.arr("notes").enumerated()), id: \.offset) { _, note in
                     Section(note.str("title")) {
-                        ForEach(note.strs("lines"), id: \.self) { line in
+                        ForEach(Array(note.strs("lines").enumerated()), id: \.offset) { _, line in
                             Text(line)
                         }
                     }