Fix: Add video icon in knowledge base #10703 (#10832)

### What problem does this PR solve?

Fix: Add video icon in knowledge base

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

web/src/pages/dataset/dataset/index.tsx

@@ -86,7 +86,7 @@ export default function Dataset() {
           leftPanel={
             <div className="items-start">
               <div className="pb-1">{t('knowledgeDetails.subbarFiles')}</div>
-              <div className="text-text-sub-title-invert text-sm">
+              <div className="text-text-secondary text-sm">
                 {t('knowledgeDetails.datasetDescription')}
               </div>
             </div>

web/src/pages/home/applications.tsx

@@ -41,7 +41,7 @@ export function Applications() {
   return (
     <section className="mt-12">
       <div className="flex justify-between items-center mb-5">
-        <h2 className="text-2xl font-bold flex gap-2.5">
+        <h2 className="text-2xl font-semibold flex gap-2.5">
           {/* <IconFont
             name={IconMap[val as keyof typeof IconMap]}
             className="size-8"

web/src/pages/home/datasets.tsx

@@ -21,7 +21,7 @@ export function Datasets() {
 
   return (
     <section>
-      <h2 className="text-2xl font-bold mb-6 flex gap-2.5 items-center">
+      <h2 className="text-2xl font-semibold mb-6 flex gap-2.5 items-center">
         {/* <IconFont name="data" className="size-8"></IconFont> */}
         <HomeIcon name="datasets" width={'32'} />
         {t('header.dataset')}