test(web): refresh subagent conversation goldens for the pinned-approval Custom chip

The delegation-pinned approval/policy: never makes a child session's knobs
match no preset, so the child conversation's Access chip truthfully reads
Custom.

apps/web/tests/snapshots/subagent-interrupt/offline-composer.expected.md

@@ -18,6 +18,6 @@
 - textbox "Parent session offline; sending is unavailable but you can still stop the run" [disabled]
 - button "Commands" [disabled]:
   - img
-- 'button "Access mode, current: Workspace Write" [disabled]': Workspace Write
+- 'button "Access mode, current: Custom" [disabled]': Custom
 - button "Stop generating"
 - button "Send message" [disabled]