fix: 解决签名题目预览无法签名的问题

- 显示签名工具列表
- 签名修复

src/views/Design/components/Questions/SignQuestion.vue

@@ -74,9 +74,9 @@ onMounted(() => {
 
   // 触摸开始，开始绘制适用于移动设备
   signatureCanvas.value?.addEventListener('touchstart', (e) => {
-    if (!active.value) {
+    // if (!active.value) {
-      return;
+    //   return;
-    }
+    // }
     // 防止页面滚动
     e.preventDefault();
     isDrawing = true;
@@ -223,7 +223,7 @@ async function handleUploadImg() {
           style="border: 1px dashed #ccc; border-radius: 4px"
         >
         </canvas>
-        <div v-if="active" class="sign-text" :class="{ show: active }">
+        <div class="sign-text" :class="{ show: true }">
           <span
             class="icon mobilefont mobilefont-qingkong"
             title="清空"
@@ -237,7 +237,7 @@ async function handleUploadImg() {
           ></span>
           <span class="icon mobilefont mobilefont-shangchuan" @click="handleUploadImg"></span>
         </div>
-        <div v-else class="sign-tips">请在空白区域书写您的签名</div>
+        <div class="sign-tips">请在空白区域书写您的签名</div>
       </div>
     </template>
   </van-field>