Close rewind menu when the action errors

handleSelect only ran setIsOpen(false) on the success path. When the
rewind action failed, the catch block swallowed the error but the menu
stayed open, blocking subsequent interactions with the page.

Close in finally so success and error both dismiss the menu.

packages/app/src/components/rewind/rewind-menu.tsx

@@ -61,11 +61,11 @@ export const RewindMenu = memo(function RewindMenu({
       setPendingMode(mode);
       try {
         await onRewind({ mode, rewoundText });
-        setIsOpen(false);
       } catch {
         // useRewindAgentMutation owns the toast; the menu only owns flow state.
       } finally {
         setPendingMode(null);
+        setIsOpen(false);
       }
     },
     [isLocked, onRewind, rewoundText],