feat(app): 集成图片上传到编辑器 — 拍照/相册 + 压缩 + 拖拽定位

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

@@ -7,6 +7,8 @@
 // - 单击选中/取消选中
 // - 选中时显示边框和删除按钮
 
+import 'dart:io';
+
 import 'package:flutter/material.dart';
 
 import '../../../data/models/journal_element.dart';
@@ -176,21 +178,18 @@ class _DraggableElementState extends State<DraggableElement> {
         );
 
       case ElementType.image:
-        return Container(
-          color: Colors.grey.shade200,
-          alignment: Alignment.center,
-          child: Column(
-            mainAxisAlignment: MainAxisAlignment.center,
-            children: [
-              Icon(Icons.image_rounded, size: 32, color: Colors.grey.shade400),
-              const SizedBox(height: 4),
-              Text(
-                '照片',
-                style: TextStyle(fontSize: 12, color: Colors.grey.shade500),
-              ),
-            ],
-          ),
-        );
+        final filePath = element.content['filePath'] as String?;
+        if (filePath != null && filePath.isNotEmpty) {
+          return ClipRRect(
+            borderRadius: BorderRadius.circular(4),
+            child: Image.file(
+              File(filePath),
+              fit: BoxFit.contain,
+              errorBuilder: (_, __, ___) => _buildImagePlaceholder(),
+            ),
+          );
+        }
+        return _buildImagePlaceholder();
 
       case ElementType.tape:
         final tapeColor = _parseColor(element.content['tapeColor'] as String?);
@@ -230,4 +229,24 @@ class _DraggableElementState extends State<DraggableElement> {
     if (value == null) return const Color(0xFF2D2420);
     return Color(0xFF000000 + value);
   }
+
+  /// 图片加载失败时的占位符
+  Widget _buildImagePlaceholder() {
+    return Container(
+      width: 160,
+      height: 120,
+      decoration: BoxDecoration(
+        color: Colors.grey.shade200,
+        borderRadius: BorderRadius.circular(4),
+      ),
+      child: const Column(
+        mainAxisAlignment: MainAxisAlignment.center,
+        children: [
+          Icon(Icons.broken_image_outlined, color: Colors.grey),
+          SizedBox(height: 4),
+          Text('图片加载失败', style: TextStyle(color: Colors.grey, fontSize: 11)),
+        ],
+      ),
+    );
+  }
 }