Vocab Flashcards — make session size configurable in Settings

VocabVerbPool.sessionCardLimit was hardcoded at 20. Settings now has a
"Vocab Flashcards → Cards per session" picker (10 / 15 / 20 / 25 / 30 /
50 / All) backed by the vocabSessionCardLimit @AppStorage key.

VocabVerbPool.sessionCardLimit became a computed property reading that
key (0/unset → default 20; 999 → "All"). Applies to both Quiz and Learn
modes since they share the same session pool.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Conjuga/Conjuga/Services/VocabSessionQueue.swift

@@ -116,9 +116,13 @@ struct VocabSessionQueue {
 /// sitting is bounded — proper SRS behaviour rather than a 100+ card slog.
 enum VocabVerbPool {
 
-    /// Maximum verbs in one session. Overdue cards are pulled first, then new
-    /// (never-reviewed) verbs fill the rest.
-    static let sessionCardLimit = 20
+    /// Maximum verbs in one session, from the "Cards per session" setting
+    /// (`vocabSessionCardLimit`). Defaults to 20 when unset; 999 means "All".
+    /// Overdue cards are pulled first, then new (never-reviewed) verbs.
+    static var sessionCardLimit: Int {
+        let stored = UserDefaults.standard.integer(forKey: "vocabSessionCardLimit")
+        return stored == 0 ? 20 : stored
+    }
 
     static func sessionVerbs(
         localContext: ModelContext,

Conjuga/Conjuga/Views/Settings/SettingsView.swift

@@ -10,6 +10,10 @@ struct SettingsView: View {
     @State private var showVosotros: Bool = true
     @State private var autoFillStem: Bool = false
 
+    /// Cards per vocab-practice session. 999 = "All" (no cap).
+    @AppStorage("vocabSessionCardLimit") private var vocabSessionCardLimit: Int = 20
+    private let vocabSessionSizes: [Int] = [10, 15, 20, 25, 30, 50, 999]
+
     private let levels = VerbLevel.allCases
     private let irregularCategories: [IrregularSpan.SpanCategory] = [
         .spelling, .stemChange, .uniqueIrregular
@@ -42,6 +46,18 @@ struct SettingsView: View {
                         }
                 }
 
+                Section {
+                    Picker("Cards per session", selection: $vocabSessionCardLimit) {
+                        ForEach(vocabSessionSizes, id: \.self) { size in
+                            Text(size == 999 ? "All" : "\(size)").tag(size)
+                        }
+                    }
+                } header: {
+                    Text("Vocab Flashcards")
+                } footer: {
+                    Text("How many verbs a Vocab Flashcards session draws. Overdue verbs are pulled first, then new ones.")
+                }
+
                 Section {
                     ForEach(levels, id: \.self) { level in
                         Toggle(level.displayName, isOn: Binding(