Feat: Replace color variables according to design draft #3221 (#9305)

### What problem does this PR solve?

Feat: Replace color variables according to design draft #3221

### Type of change


- [x] New Feature (non-breaking change which adds functionality)

web/src/pages/chunk/parsed-result/add-knowledge/components/knowledge-chunk/components/document-preview/csv-preview.tsx

@@ -84,7 +84,7 @@ const CSVFileViewer: React.FC<FileViewerProps> = () => {
               {data.headers.map((header, index) => (
                 <th
                   key={`header-${index}`}
-                  className="px-6 py-3 text-left text-sm font-medium text-text-title"
+                  className="px-6 py-3 text-left text-sm font-medium text-text-primary"
                 >
                   {header}
                 </th>