style: show assistant response note below Session Preview

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: grimmerk

src/popup.tsx

@@ -516,6 +516,9 @@ const PopupDefaultExample = ({
                   <option value="both">First + Last</option>
                 </select>
               </div>
+              <div style={{ padding: '0 16px 2px', fontSize: '9px', color: '#555' }}>
+                ◀ Assistant response always shown
+              </div>
               <div style={rowStyle}>
                 <span style={labelStyle} title="Uses Claude Code hooks to detect session state">Session Status <span style={{ fontSize: '10px', color: '#888' }}>(hooks)</span></span>
                 <label