test(web-cards): update card specs and snapshots for collapsed ToolRow

Rewrite the read/search/web/diff card spec suites for the collapsed-by-default
ToolRow composition: each row now needs the conversation `t`, and the card is
absent from the DOM until the row's [data-expandable] toggle is clicked. Refresh
the built-boot and search-card assembled snapshots (they expand the row before
shaping the card) and the code-mode-round golden. Fix a fixture turn-number
collision the 985/986 merge introduced (grep reused turn 67, already the
multi-hunk edit's, so both shared one callId) by renumbering search/web/todo to
68-72. Document the refactor's behavior in the ui-conversation README (both
languages) and add the Agent Note.

apps/web/tests/snapshots/code-mode-round/ui.expected.md

@@ -20,8 +20,10 @@
   - img
   - text: Code Run bash echo and catch missing file read
 - img
-- text: Bash Echo CODE_ROUND_OK 失败 Read
-- button "missing.txt"
+- text: Bash Echo CODE_ROUND_OK
+- 'button "Read Error: cannot read \"{{cwd}}/workspace/missing.txt\": not found"':
+  - img
+  - text: "Read Error: cannot read \"{{cwd}}/workspace/missing.txt\": not found"
 - button "Think The program ran successfully. Let me now reply DONE as instructed.":
   - img
   - img