feat(rectification): the server writes the evidence recap — 「记下了 N 件事」 with the ledger list collapsed under it (BUG-1136)

- Evidence turns whose batch accepted items: the body is the server recap
  built from those items (two or fewer listed inline, more as a count);
  the model no longer restates them (both prompt sets updated).
- The case snapshot carries each assistant turn's recorded evidence from
  the ledger (rejected/superseded excluded); the message shows it in a
  collapsed <details> list when more than two.
- Chinese date labels read straight into the event phrase (2016年入学);
  ISO labels keep their space.
- Assertions updated with original/new/reason notes.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017eEAG8HD3mm8gsKXgk8uU8

frontend/src/app/globals.css

@@ -3380,6 +3380,23 @@ input:not([type="radio"]):not([type="checkbox"]):not([class^="ant-"]):not([class
   font-size: var(--type-caption);
 }
 
+/* BUG-1136: what an evidence turn recorded, collapsed under 「记下了 N 件事」. */
+.rectification-recorded-evidence {
+  margin-block-start: var(--space-2);
+  color: var(--color-ink-secondary);
+  font-size: var(--type-caption);
+}
+.rectification-recorded-evidence > summary {
+  cursor: pointer;
+  width: fit-content;
+}
+.rectification-recorded-evidence > ul {
+  margin: var(--space-2) 0 0;
+  padding-inline-start: 1.2em;
+  display: grid;
+  gap: var(--space-1);
+  color: var(--color-ink);
+}
 .rectification-message-question {
   display: grid;
   gap: var(--space-3);