AI场景教学中提高返回按钮的层级，不被遮挡层挡住

src/views/AIPage/aiGenerate/DialogContent.vue

@@ -775,7 +775,6 @@ onUnmounted(() => {
   justify-content: space-between;
   color: white;
   padding: 0 rpx(20);
-  z-index: 10;
 }
 
 .title-left {
@@ -784,6 +783,7 @@ onUnmounted(() => {
   display: flex;
   align-items: center;
   gap: rpx(5);
+  z-index: 30;
   .box-icon {
     display: flex;
     align-items: center;
@@ -823,6 +823,7 @@ onUnmounted(() => {
   width: fit-content;
   padding: 0 rpx(100);
   min-width: rpx(100);
+  z-index: 10;
 }
 
 .title-text {
@@ -833,7 +834,6 @@ onUnmounted(() => {
   align-items: center;
   justify-content: center;
   white-space: nowrap;
-  // background-color: rgba(255, 255, 255, 90%);
 }
 
 .title-right {
@@ -843,6 +843,7 @@ onUnmounted(() => {
     align-items: center;
     justify-content: flex-end;
     gap: rpx(10);
+    z-index: 10;
     .box-icon {
       display: flex;
       align-items: center;