feat: Improve Visual Distinction Between Trim and Chapters Editors

frontend-tools/video-editor/client/src/App.tsx

@@ -309,6 +309,13 @@ const App = () => {
           canRedo={historyPosition < history.length - 1}
         />
 
+        {/* Timeline Header */}
+        <div style={{ marginLeft: '1rem', marginTop: '-0.5rem' }}>
+          <h2 style={{ fontSize: '1.125rem', fontWeight: 600, color: '#2563eb', margin: 0 }}>
+            Trim or Split
+          </h2>
+        </div>
+
         {/* Timeline Controls */}
         <TimelineControls
           currentTime={currentTime}