feat(editor): 添加图片预览功能并支持缩放

- 在编辑器点击图片时显示全屏预览弹窗
- 支持通过鼠标滚轮缩放预览图片（0.1-5倍）
- 使用Teleport将弹窗渲染到body避免样式冲突
- 添加淡入动画和关闭按钮提升用户体验

src/components/LivePreviewEditor.vue

@@ -1,12 +1,29 @@
 <template>
-  <div class="live-editor">
+  <div class="live-editor" @click="handleEditorClick">
     <EditorToolbar @action="handleToolbarAction" />
     <codemirror v-model="code" placeholder="请输入 Markdown 内容..." :style="{ height: '0', flex: 1, fontSize: 'var(--editor-font-size)', color: 'var(--primary-color)' }" :autofocus="true" :indent-with-tab="true" :tab-size="2" :extensions="extensions" @ready="handleReady" @change="handleChange" />
+    
+    <!-- 图片预览弹窗 -->
+    <Teleport to="body">
+      <div v-if="previewImage.visible" class="image-preview-modal" @click="closePreview" @wheel.prevent="handlePreviewWheel">
+        <div class="preview-controls">
+          <span class="close-btn" @click.stop="closePreview" title="关闭">×</span>
+        </div>
+        <div class="preview-content" @click.stop>
+          <img
+            :src="previewImage.url"
+            :style="{ transform: `scale(${previewImage.scale})` }"
+            class="preview-image"
+            draggable="false"
+          />
+        </div>
+      </div>
+    </Teleport>
   </div>
 </template>
 
 <script setup>
-import { computed, onUnmounted, ref, watch, shallowRef } from "vue";
+import { computed, onUnmounted, ref, watch, shallowRef, reactive } from "vue";
 import { Codemirror } from "vue-codemirror";
 import { markdown, markdownLanguage } from "@codemirror/lang-markdown";
 import { languages } from "@codemirror/language-data";
@@ -306,6 +323,34 @@ const executeAction = (view, action, payload) => {
   }
 };
 
+// 图片预览相关逻辑
+const previewImage = reactive({
+  visible: false,
+  url: "",
+  scale: 1,
+  rotate: 0,
+});
+
+const handleEditorClick = (e) => {
+  if (e.target.classList.contains("cm-md-image-preview")) {
+    previewImage.url = e.target.src;
+    previewImage.scale = 1;
+    previewImage.rotate = 0;
+    previewImage.visible = true;
+  }
+};
+
+const closePreview = () => {
+  previewImage.visible = false;
+};
+
+const handlePreviewWheel = (e) => {
+  const delta = e.deltaY > 0 ? -0.1 : 0.1;
+  const newScale = previewImage.scale + delta;
+  // 限制缩放范围 0.1 - 5
+  previewImage.scale = Math.min(Math.max(0.1, newScale), 5);
+};
+
 onUnmounted(() => {
   if (typeof detachPaste === "function") detachPaste();
   if (removeActionListener) removeActionListener();
@@ -333,3 +378,70 @@ onUnmounted(() => {
   color: var(--primary-color);
 }
 </style>
+
+<style>
+/* 图片预览弹窗样式 - 全局生效以支持 Teleport */
+.image-preview-modal {
+  position: fixed;
+  top: 0;
+  left: 0;
+  width: 100vw;
+  height: 100vh;
+  background-color: rgba(0, 0, 0, 0.9);
+  z-index: 9999;
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  user-select: none;
+  animation: fadeIn 0.2s ease-out;
+}
+
+.preview-controls {
+  position: absolute;
+  top: 30px;
+  right: 40px;
+  z-index: 10000;
+}
+
+.close-btn {
+  color: rgba(255, 255, 255, 0.8);
+  font-size: 48px;
+  cursor: pointer;
+  line-height: 1;
+  transition: all 0.2s;
+  display: block;
+  font-family: Arial, sans-serif;
+}
+
+.close-btn:hover {
+  color: #fff;
+  transform: scale(1.1);
+}
+
+.preview-content {
+  width: 100%;
+  height: 100%;
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  overflow: hidden;
+}
+
+.preview-image {
+  max-width: 90%;
+  max-height: 90%;
+  object-fit: contain;
+  transition: transform 0.1s ease-out;
+  cursor: grab;
+  box-shadow: 0 0 20px rgba(0,0,0,0.5);
+}
+
+.preview-image:active {
+  cursor: grabbing;
+}
+
+@keyframes fadeIn {
+  from { opacity: 0; }
+  to { opacity: 1; }
+}
+</style>