test(web): update plan preview snapshots after removing copy button

apps/web/tests/expected/plan-review/temporary.expected.md

@@ -1,6 +1,4 @@
 - region "Temporary review":
-  - button "Copy":
-    - img
   - heading "Temporary review" [level=1]
   - paragraph: Review without a tool invocation.
   - heading "Implementation" [level=2]

snapshots/web/plan-review/preview.expected.md

@@ -1,6 +1,4 @@
 - 'region "Add `--greeting` flag to CLI"':
-  - button "Copy":
-    - img
   - heading "Add --greeting flag to CLI" [level=1]:
     - text: Add
     - code: "--greeting"