完善Panel组件：添加maximized属性以支持最大化/还原图标切换，确保填充满父容器

AutoRobot/Windows/Robot/Web/src/DockLayout/Panel.vue

@@ -19,14 +19,25 @@
           </button>
           <button class="button-icon p-[2px] rounded hover:opacity-100 opacity-80" 
                   @click="onMaximize" 
-                  aria-label="最大化">
-            <!-- 最大化图标：仅外框1px + 两行填充 -->
-            <svg class="icon-square-svg" width="11" height="11" viewBox="0 0 11 11" aria-hidden="true">
-              <rect x="0.5" y="0.5" width="10" height="10" fill="#cbd6ff" stroke="#8ea3d8" stroke-width="1" />
-              <rect x="3" y="3" width="5" height="1" fill="#b8c6ff" />
-              <!-- 下行采用更宽填充以贴近示例图 -->
-              <rect x="1" y="3" width="8.5" height="6.5" fill="#435d9c" />
-            </svg>
+                  :aria-label="maximized ? '还原' : '最大化'">
+            <!-- 最大化图标 -->
+            <template v-if="!maximized">
+              <!-- 最大化图标：外框 + 内部线条 -->
+              <svg class="icon-square-svg" width="11" height="11" viewBox="0 0 11 11" aria-hidden="true">
+                <rect x="0.5" y="0.5" width="10" height="10" fill="#cbd6ff" stroke="#8ea3d8" stroke-width="1" />
+                <rect x="1" y="1" width="9" height="9" fill="none" stroke="#b8c6ff" stroke-width="1" />
+              </svg>
+            </template>
+            <!-- 还原图标 -->
+            <template v-else>
+              <!-- 还原图标：两个重叠的外框 -->
+              <svg class="icon-square-svg" width="11" height="11" viewBox="0 0 11 11" aria-hidden="true">
+                <!-- 第一个外框 -->
+                <rect x="0.5" y="2.5" width="6" height="6" fill="#cbd6ff" stroke="#8ea3d8" stroke-width="1" />
+                <!-- 第二个外框 -->
+                <rect x="3.5" y="0.5" width="6" height="6" fill="#cbd6ff" stroke="#8ea3d8" stroke-width="1" />
+              </svg>
+            </template>
           </button>
           <button class="button-icon p-[2px] rounded hover:opacity-100 opacity-80" 
                   @click="onClose" 
@@ -95,6 +106,10 @@ const props = defineProps({
   toolbarExpanded: {
     type: Boolean,
     default: false
+  },
+  maximized: {
+    type: Boolean,
+    default: false
   }
 });
 
@@ -175,6 +190,10 @@ const onDragEnd = () => {
 /* 面板基础样式 */
 .panel {
   border: 1px solid #c7d2ea;
+  display: flex;
+  flex-direction: column;
+  width: 100%;
+  height: 100%;
 }
 
 /* 图标样式优化 */