feat(渲染编辑): 修复保存、文字与渲染问题

assets/webui/index.html

@@ -43,8 +43,7 @@
 				<button id="continuousButton" class="button" type="button" data-short="连" title="连续显示" aria-label="连续显示" aria-pressed="false" disabled>连续</button>
 				<button id="annotationButton" class="button" type="button" data-short="注" title="隐藏注解" aria-label="隐藏注解" aria-pressed="true">注解</button>
 			</div>
-			<div class="tool-group" role="group" aria-labelledby="exportLabel">
-				<span id="exportLabel" class="tool-label">导出</span>
+			<div class="tool-group" role="group" aria-label="导出">
 				<select id="exportFormat" class="format-select" title="导出格式" aria-label="导出格式" disabled></select>
 				<select id="imageDPI" class="format-select dpi-select" title="导出DPI（仅PNG/JPG）" aria-label="导出DPI" disabled>
 					<option value="96">96 dpi</option>