fix(web-search-card): surface truncation recovery, widen cardless fallback, validate wire shape, fix tail-cap

Address the ds-review-bot findings on the search card:

- searchCardModel dropped the result view's `content`, so a capped search's
  `Full … stored at: <locator>` recovery footer vanished from the UI (the card
  replaces the raw text). Thread it through as `SearchCardModel.recovery` and
  render it below the card at all three sites, only when truncated.
- SearchRow's fallback body was gated on `state === 'error'`, so a settled
  non-error call with no card (a successful nested run_code sub-dispatch, a
  legacy generic result) showed only its summary with content lost. Widen it to
  any settled call with `search === null`.
- searchCardModel trusted the `files`/`paths` shape the host wire schema only
  string-checks; a malformed known-kind frame would crash SearchBlock. Validate
  the full shape and fall to the generic path on mismatch.
- SearchBlock's restored tail file header added a row without consuming a tail
  slot, exceeding maxLines by one and overstating the hidden count. Make it
  consume a slot so the visible count holds at maxLines and `hidden` stays exact.

Correct the fixture JSDoc (now genuinely exceeds the row cap) and the Agent Note
recovery-text claim, sync the ui-conversation bilingual README with the search
row, and add an assembled keyless snapshot (apps/web/tests/search-card.snapshot.ts)
that pins the grep card's shape from the built bundles.

packages/client/connection/src/client/fixture.ts

@@ -159,6 +159,15 @@ const SEARCH_MATCHES_FIXTURE: { path: string; matches: { lineNumber: number; lin
       { lineNumber: 60, line: 'export function searchCardModel(block: ToolCallBlock): SearchCardModel | null {' },
     ],
   },
+  {
+    path: 'packages/client/ui-conversation/src/client/toolviews/search-row.tsx',
+    matches: [
+      { lineNumber: 71, line: 'export function SearchRow({ toolName, block }: ToolRowProps) {' },
+      { lineNumber: 73, line: '  const search = searchCardModel(block)' },
+      { lineNumber: 90, line: '        <SearchBlock {...search.card} maxLines={CHAT_SEARCH_MAX_LINES} className={css.search} />' },
+      { lineNumber: 113, line: "    ctx.slots.register({ name: 'conversation.chat.toolview', key: 'grep' }, SearchRow)" },
+    ],
+  },
 ]
 
 /**
@@ -169,7 +178,7 @@ const SEARCH_MATCHES_FIXTURE: { path: string; matches: { lineNumber: number; lin
  * `Line N:` rows, then a spill-recovery footer.
  */
 const SEARCH_MATCHES_TEXT = [
-  'Found 5 of 42 matches',
+  'Found 9 of 42 matches',
   '',
   ...SEARCH_MATCHES_FIXTURE.map(file =>
     [file.path, ...file.matches.map(m => `Line ${m.lineNumber}: ${m.line}`)].join('\n')),