chore: remove useless Work mode filler box from ticket sidebar

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

web/src/app/tickets/[id]/page.tsx

@@ -1006,15 +1006,6 @@ export default function TicketDetailPage({
             )}
           </section>
 
-          <section className="rounded-md border border-border bg-accent/38 p-3">
-            <div className="flex items-center gap-2 text-sm font-semibold text-foreground">
-              <UserRoundIcon className="h-4 w-4 text-primary" />
-              Work mode
-            </div>
-            <p className="mt-2 text-sm text-muted-foreground">
-              Reply from the dock, preview status automation, then commit changes when the side effects look right.
-            </p>
-          </section>
         </div>
       </aside>
     </div>