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.

packages/client/ui-conversation/README.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/client/ui-conversation/README.md
-README.md: b183aab56a10c3a22eeab31f8b1b0e6b5219beba
-README.zh.md: af6427774a048de324d57bc9856f77547e9a03cc
+README.md: 8003e8901d580b4aae64b5920427e789e2233acc
+README.zh.md: ff734b719ccb569f303aada43a3f83fde70f5d84