feat(app): 集成文字输入到编辑器 — TextInputOverlay + 工具栏选项行

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

@@ -22,6 +22,7 @@ import '../widgets/handwriting_canvas.dart';
 import '../widgets/stroke_model.dart';
 import '../widgets/draggable_element.dart';
 import '../widgets/editor_toolbar.dart';
+import '../widgets/text_input_overlay.dart';
 
 /// 手账编辑器页面
 class EditorPage extends StatelessWidget {
@@ -171,7 +172,7 @@ class _EditorView extends StatelessWidget {
             Expanded(
               child: BlocBuilder<EditorBloc, EditorState>(
                 builder: (context, state) {
-                  return _EditorStack(state: state);
+                  return _EditorStack(state: state, journalId: journalId);
                 },
               ),
             ),
@@ -258,8 +259,9 @@ class _EditorView extends StatelessWidget {
 /// Layer 3 (顶层): 由 _EditorView 中的工具栏处理
 class _EditorStack extends StatelessWidget {
   final EditorState state;
+  final String? journalId;
 
-  const _EditorStack({required this.state});
+  const _EditorStack({required this.state, this.journalId});
 
   @override
   Widget build(BuildContext context) {
@@ -285,6 +287,30 @@ class _EditorStack extends StatelessWidget {
         if (state.elements.isNotEmpty)
           _buildElementLayer(context),
 
+        // 文字输入覆盖层（文字工具激活时显示）
+        if (state.activeTool == EditorTool.text)
+          TextInputOverlay(
+            onConfirmed: (text, fontSize, fontColor) {
+              final center = Offset(
+                MediaQuery.of(context).size.width / 2 - 80,
+                MediaQuery.of(context).size.height / 3,
+              );
+              context.read<EditorBloc>().add(ElementAdded(
+                JournalElement.createText(
+                  journalId: journalId ?? '',
+                  text: text,
+                  position: center,
+                  fontSize: fontSize,
+                  fontColor: fontColor,
+                ),
+              ));
+              context.read<EditorBloc>().add(ToolChanged(EditorTool.select));
+            },
+            onCancelled: () {
+              context.read<EditorBloc>().add(ToolChanged(EditorTool.select));
+            },
+          ),
+
         // 空状态提示
         if (state.strokes.isEmpty && state.elements.isEmpty)
           _buildEmptyHint(context),