feat(ios): M2-04 测验入口（KB详情页 + 学习首页快捷操作）

- KB详情页 toolbar 新增 ? 测验按钮
- 学习首页新增快捷操作栏（AI问答/自测/复习）

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

AIStudyApp/AIStudyApp/Features/Library/LibrarySubpages.swift

@@ -265,6 +265,11 @@ struct LibraryDetailPage: View {
                         Image(systemName: "trash").font(.system(size: 16)).foregroundColor(Color.zxF03)
                     }
                 }
+                ToolbarItem(placement: .topBarTrailing) {
+                    NavigationLink(value: Route.quizList(knowledgeBaseId: knowledgeBaseId)) {
+                        Image(systemName: "questionmark.circle").font(.system(size: 16)).foregroundColor(Color.zxF05)
+                    }
+                }
                 ToolbarItem(placement: .topBarTrailing) {
                     NavigationLink(value: Route.addKnowledge(knowledgeBaseId: knowledgeBaseId)) {
                         Image(systemName: "plus").font(.system(size: 16, weight: .semibold)).foregroundColor(Color.zxPrimary)

AIStudyApp/AIStudyApp/Features/Study/StudyHomeView.swift

@@ -51,6 +51,28 @@ struct StudyHomeView: View {
                     // MARK: - Weekly Summary
                     weeklySummaryCard
 
+                    // MARK: - Quick Actions
+                    HStack(spacing: 12) {
+                        NavigationLink(value: Route.aiChat) {
+                            VStack(spacing: 6) {
+                                Image(systemName: "sparkles").font(.system(size: 18)).foregroundColor(Color.zxPurple).frame(width: 44, height: 44).background(Color.zxPurpleBG(0.12)).clipShape(RoundedRectangle(cornerRadius: 12))
+                                Text("AI 问答").font(.system(size: 11)).foregroundColor(Color.zxF04)
+                            }.frame(maxWidth: .infinity)
+                        }.foregroundColor(.primary)
+                        NavigationLink(value: Route.activeRecall) {
+                            VStack(spacing: 6) {
+                                Image(systemName: "brain.head.profile").font(.system(size: 18)).foregroundColor(Color.zxOrange).frame(width: 44, height: 44).background(Color.zxOrangeBG(0.12)).clipShape(RoundedRectangle(cornerRadius: 12))
+                                Text("自测").font(.system(size: 11)).foregroundColor(Color.zxF04)
+                            }.frame(maxWidth: .infinity)
+                        }.foregroundColor(.primary)
+                        NavigationLink(value: Route.reviewCard) {
+                            VStack(spacing: 6) {
+                                Image(systemName: "arrow.triangle.2.circlepath").font(.system(size: 18)).foregroundColor(Color.zxTeal).frame(width: 44, height: 44).background(Color.zxTeal.opacity(0.12)).clipShape(RoundedRectangle(cornerRadius: 12))
+                                Text("复习").font(.system(size: 11)).foregroundColor(Color.zxF04)
+                            }.frame(maxWidth: .infinity)
+                        }.foregroundColor(.primary)
+                    }.padding(.horizontal, 20)
+
                     // MARK: - Today Tasks
                     VStack(alignment: .leading, spacing: 12) {
                         HStack {