feat: add terminal broadcast, context menu, and shell close

Complete multi-pane broadcast, standard terminal right-click actions, batch host selection with progress, and native ssh_close_shell so closing a pane tears down the remote shell.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/components/layout/Sidebar.tsx

@@ -429,7 +429,8 @@ export default function Sidebar({ onNewSession, onQuickConnect, onEditSession }:
     {ConfirmDialogComponent}
     <BatchCommandDialog
       isOpen={batchCommandOpen}
-      sessions={batchCommandSessions}
+      sessions={sessions}
+      initialSelectedIds={batchCommandSessions.map((session) => session.id)}
       onClose={() => setBatchCommandOpen(false)}
     />
     </>