build(chat): consume partial-markdown 0.5.2 — streaming table headers

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: blove

libs/chat/package.json

@@ -10,7 +10,7 @@
   },
   "dependencies": {
     "@cacheplane/partial-json": ">=0.1.1 <0.3.0",
-    "@cacheplane/partial-markdown": "^0.5.0"
+    "@cacheplane/partial-markdown": "^0.5.2"
   },
   "peerDependencies": {
     "zod": "^3.25.0",

libs/chat/src/lib/markdown/streaming-table.spec.ts

@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: MIT
+//
+// Consumer-side guarantee: with the partial-markdown version chat depends on, a
+// streaming table header renders as a `table` immediately — before the delimiter
+// row and while it is buffered awaiting the delimiter — instead of blanking out.
+// Guards against a dependency downgrade reintroducing the table blank/flash.
+import { describe, it, expect } from 'vitest';
+import { createPartialMarkdownParser, materialize } from '@cacheplane/partial-markdown';
+
+function topType(p: ReturnType<typeof createPartialMarkdownParser>): string | null {
+  const doc = materialize(p.root) as { children?: Array<{ type: string }> } | null;
+  return doc?.children?.[0]?.type ?? null;
+}
+
+describe('libs/chat consumes streaming table headers', () => {
+  it('shows a table header immediately, before and during the delimiter wait', () => {
+    const p = createPartialMarkdownParser();
+    p.push('| Name | Age |'); // first row, still on the open line (no newline)
+    expect(topType(p)).toBe('table'); // pre-0.5.2: null (header buffered/blank)
+    p.push('\n'); // header committed; delimiter not yet streamed
+    expect(topType(p)).toBe('table'); // pre-0.5.2: null (the blank gap)
+    p.push('| --- | --- |\n| Ada | 36 |\n'); // delimiter + body commit
+    const doc = materialize(p.root) as any;
+    expect(doc.children).toHaveLength(1);
+    expect(doc.children[0].type).toBe('table');
+    expect(doc.children[0].children.length).toBeGreaterThanOrEqual(2); // header + body
+  });
+});