Add role heading to select workspace dialog header

Bug: 406069124
Change-Id: If469d06a76a562552c1d443513000b909aebf2c8
Fixed: 406069124
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6437940
Auto-Submit: Samiya Caur <samiyac@chromium.org>
Commit-Queue: Ergün Erdoğmuş <ergunsh@chromium.org>
Reviewed-by: Ergün Erdoğmuş <ergunsh@chromium.org>

Author: Samiya Caur

front_end/panels/ai_assistance/SelectWorkspaceDialog.ts

@@ -101,7 +101,7 @@ export class SelectWorkspaceDialog extends UI.Widget.VBox {
       const hasFolders = input.folders.length > 0;
       render(
         html`
-          <div class="dialog-header">${lockedString(UIStringsNotTranslate.selectFolder)}</div>
+          <h2 class="dialog-header">${lockedString(UIStringsNotTranslate.selectFolder)}</h2>
           <div class="main-content">
             <div class="select-project-root">${lockedString(UIStringsNotTranslate.selectProjectRoot)}</div>
             <div>${lockedString(UIStringsNotTranslate.sourceCodeSent)}</div>