testing(web): re-record the markdown image golden for the model trigger

The scenario arrived with master and recorded its trigger while the Host
still synthesized an unlisted current model. This branch stopped doing that,
so the trigger reads `Select model` until the user picks an advertised one.

apps/web/tests/snapshots/markdown-images/ui.expected.md

@@ -24,8 +24,8 @@
 - button "Commands":
   - img
 - 'button "Access mode, current: Workspace Write"': Workspace Write
-- button "Select model, current deepseek-v4-flash":
-  - text: deepseek-v4-flash
+- button "Select model":
+  - text: Select model
   - img
 - button "Send message" [disabled]
 - text: 1 turns · 1 steps Input 0 tok · Output 0 tok