feat(app): 编辑器完成按钮接入分享面板 — ShareBottomSheet + sharedToClass更新

app/lib/features/editor/views/editor_page.dart

@@ -17,6 +17,7 @@ import '../../../core/constants/design_tokens.dart';
 import '../../../data/models/journal_element.dart';
 import '../../../data/models/journal_entry.dart';
 import '../../../data/repositories/journal_repository.dart';
+import '../../../data/repositories/class_repository.dart';
 import '../bloc/editor_bloc.dart';
 import '../widgets/handwriting_canvas.dart';
 import '../widgets/stroke_model.dart';
@@ -25,6 +26,7 @@ import '../widgets/editor_toolbar.dart';
 import '../widgets/text_input_overlay.dart';
 import '../widgets/image_picker_handler.dart';
 import '../widgets/sticker_picker_sheet.dart';
+import '../widgets/share_bottom_sheet.dart';
 
 /// 手账编辑器页面
 class EditorPage extends StatelessWidget {
@@ -55,12 +57,10 @@ class EditorPage extends StatelessWidget {
       child: _EditorView(
         journalId: journalId,
         templateId: templateId,
+        savedJournalId: savedJournalId,
+        repo: repo,
         onSaveComplete: () {
-          if (context.canPop()) {
-            context.pop();
-          } else {
-            context.go('/home');
-          }
+          _showShareSheetAndNavigate(context, repo, savedJournalId);
         },
       ),
     );
@@ -152,14 +152,73 @@ class EditorPage extends StatelessWidget {
       await repo.addElement(element);
     }
   }
+
+  /// 显示分享面板并在用户选择后导航
+  static void _showShareSheetAndNavigate(
+    BuildContext context,
+    JournalRepository repo,
+    String? savedJournalId,
+  ) {
+    // 尝试获取用户的班级信息
+    String? userClassId;
+    String userClassName = '我的班级';
+
+    try {
+      context.read<ClassRepository>();
+      // Phase 1 简化：不等待异步调用，使用默认值
+      userClassId = null; // TODO: 从 AuthBloc/ClassBloc 获取真实班级 ID
+    } catch (_) {
+      // ClassRepository 不可用（未注入）
+    }
+
+    showModalBottomSheet(
+      context: context,
+      isScrollControlled: true,
+      builder: (sheetContext) => ShareBottomSheet(
+        classId: userClassId,
+        className: userClassName,
+        onDecision: (shareToClass) async {
+          // 更新日记的 sharedToClass 状态
+          if (savedJournalId != null) {
+            try {
+              final entry = await repo.getJournal(savedJournalId);
+              if (entry != null) {
+                await repo.updateJournal(
+                  entry.copyWith(sharedToClass: shareToClass),
+                );
+              }
+            } catch (e) {
+              debugPrint('更新分享状态失败: $e');
+            }
+          }
+
+          // 导航返回
+          if (!context.mounted) return;
+          if (context.canPop()) {
+            context.pop();
+          } else {
+            context.go('/home');
+          }
+        },
+      ),
+    );
+  }
 }
 
 class _EditorView extends StatelessWidget {
   final String? journalId;
   final String? templateId;
+  final String? savedJournalId;
+  final JournalRepository repo;
   final VoidCallback onSaveComplete;
 
-  const _EditorView({this.journalId, this.templateId, required this.onSaveComplete});
+  const _EditorView({
+    this.journalId,
+    this.templateId,
+    this.savedJournalId,
+    required this.repo,
+    required this.onSaveComplete,
+  });
 
   @override
   Widget build(BuildContext context) {

app/lib/features/editor/widgets/share_bottom_sheet.dart

@@ -0,0 +1,119 @@
+// 分享 BottomSheet — 编辑器完成后选择分享到班级或仅自己可见
+//
+// 设计要点：
+// - 温暖友好的文案（面向小学生）
+// - 分享到班级（有班级时显示）/ 仅自己可见
+// - 无班级时提示加入班级后可分享
+
+import 'package:flutter/material.dart';
+
+/// 编辑器完成后的分享选择面板
+class ShareBottomSheet extends StatelessWidget {
+  final String? classId;
+  final String className;
+  final void Function(bool shareToClass) onDecision;
+
+  const ShareBottomSheet({
+    super.key,
+    required this.classId,
+    required this.className,
+    required this.onDecision,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final hasClass = classId != null && classId.isNotEmpty;
+    final theme = Theme.of(context);
+
+    return Container(
+      padding: const EdgeInsets.all(20),
+      decoration: BoxDecoration(
+        color: theme.colorScheme.surface,
+        borderRadius: const BorderRadius.vertical(top: Radius.circular(22)),
+      ),
+      child: Column(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          // 拖拽条
+          Center(
+            child: Container(
+              margin: const EdgeInsets.only(bottom: 16),
+              width: 40,
+              height: 4,
+              decoration: BoxDecoration(
+                color: Colors.grey.shade300,
+                borderRadius: BorderRadius.circular(2),
+              ),
+            ),
+          ),
+          Text(
+            '日记写好了！',
+            style: theme.textTheme.titleMedium,
+          ),
+          const SizedBox(height: 8),
+          Text(
+            '要分享给老师和同学们看看吗？',
+            style: theme.textTheme.bodyMedium?.copyWith(
+              color: Colors.grey.shade600,
+            ),
+          ),
+          const SizedBox(height: 24),
+
+          // 分享到班级
+          if (hasClass) ...[
+            SizedBox(
+              width: double.infinity,
+              height: 52,
+              child: FilledButton.icon(
+                onPressed: () {
+                  onDecision(true);
+                  Navigator.pop(context);
+                },
+                icon: const Icon(Icons.group),
+                label: Text('分享到 $className'),
+                style: FilledButton.styleFrom(
+                  shape: RoundedRectangleBorder(
+                    borderRadius: BorderRadius.circular(12),
+                  ),
+                ),
+              ),
+            ),
+            const SizedBox(height: 12),
+          ],
+
+          // 仅自己可见
+          SizedBox(
+            width: double.infinity,
+            height: 52,
+            child: OutlinedButton.icon(
+              onPressed: () {
+                onDecision(false);
+                Navigator.pop(context);
+              },
+              icon: const Icon(Icons.lock_outline),
+              label: const Text('仅自己可见'),
+              style: OutlinedButton.styleFrom(
+                shape: RoundedRectangleBorder(
+                  borderRadius: BorderRadius.circular(12),
+                ),
+              ),
+            ),
+          ),
+
+          // 无班级时的提示
+          if (!hasClass) ...[
+            const SizedBox(height: 12),
+            Text(
+              '加入班级后可以分享给老师和同学哦',
+              style: theme.textTheme.bodySmall?.copyWith(
+                color: Colors.grey.shade500,
+              ),
+            ),
+          ],
+
+          const SizedBox(height: 8),
+        ],
+      ),
+    );
+  }
+}