fix(phone-image): 修復5個UI問題

1. 中間預覽區工具欄折行: 縮小字號/間距(gap 8->4, font 12->11px)
2. 右側畫布缺少頁間距: 新增scaleWrapper裁切transform溢出
3. 右側對齊下拉框不可見: select改為正常文檔流,移除position:absolute
4. 正文水平居中: dom-page-content添加text-align:left
5. 列表不顯示序號/圓點: 顯式設置list-style-type + display:list-item

public/static/css/phone-image-templates.css

@@ -603,9 +603,7 @@
 }
 
 .thumb-alignment-select {
-    position: absolute;
-    bottom: 4px;
-    right: 4px;
+    display: block;
     height: 22px;
     font-size: 11px;
     border: 1px solid #d9d9d9;
@@ -613,7 +611,7 @@
     padding: 0 2px;
     background: #fff;
     cursor: pointer;
-    z-index: 10;
+    margin: 4px auto 0;
     opacity: 0;
     transition: opacity 0.2s;
 }
@@ -955,14 +953,39 @@ body > .page-header-right .layui-btn:not(.layui-btn-primary):not(.layui-btn-norm
 }
 
 /* 预览区列表 */
-#render-preview ul,
+#render-preview ul {
+    list-style-type: disc;
+    padding-left: 20px;
+    margin-bottom: 10px;
+}
+
 #render-preview ol {
+    list-style-type: decimal;
     padding-left: 20px;
     margin-bottom: 10px;
 }
 
 #render-preview li {
     margin-bottom: 5px;
+    display: list-item;
+}
+
+/* DOM分页预览列表 */
+.dom-page-content ul {
+    list-style-type: disc;
+    padding-left: 20px;
+    margin-bottom: 10px;
+}
+
+.dom-page-content ol {
+    list-style-type: decimal;
+    padding-left: 20px;
+    margin-bottom: 10px;
+}
+
+.dom-page-content li {
+    margin-bottom: 5px;
+    display: list-item;
 }
 
 /* ============================================
@@ -1152,6 +1175,7 @@ body > .page-header-right .layui-btn:not(.layui-btn-primary):not(.layui-btn-norm
     font-size: calc(14px * var(--pi-font-scale, 1));
     line-height: 1.8;
     word-break: break-word;
+    text-align: left;
 }
 
 /* DOM分页内容区对齐支持 (复用valign模式) */
@@ -1159,12 +1183,14 @@ body > .page-header-right .layui-btn:not(.layui-btn-primary):not(.layui-btn-norm
     display: flex;
     flex-direction: column;
     justify-content: center;
+    text-align: left;
 }
 
 .dom-page-content.valign-bottom {
     display: flex;
     flex-direction: column;
     justify-content: flex-end;
+    text-align: left;
 }
 
 /* --- DOM分页页码 --- */