Fix chat visibility and conversation sync

tests/matrix-client.test.ts

@@ -93,6 +93,65 @@ describe('MatrixClient HTTP timeout', () => {
   }, 10_000);
 });
 
+describe('MatrixClient direct room registration', () => {
+  it('creates rooms with the direct-message flag', async () => {
+    let requestBody: unknown;
+    const client = new MatrixClient(creds, createMockLogger(), {
+      minRequestIntervalMs: 0,
+      fetchImpl: vi.fn(async (_url, init) => {
+        requestBody = JSON.parse(String(init?.body));
+        return new Response(JSON.stringify({ room_id: '!new:example.test' }), {
+          status: 200,
+          headers: { 'content-type': 'application/json' },
+        });
+      }),
+    });
+
+    await expect(client.createDirectRoom('@them:example.test'))
+      .resolves.toBe('!new:example.test');
+    expect(requestBody).toEqual({
+      preset: 'reddit_dm',
+      invite: ['@them:example.test'],
+      is_direct: true,
+    });
+  });
+
+  it('additively repairs m.direct account data without removing existing rooms', async () => {
+    const requests: Array<{ method: string; url: string; body?: unknown }> = [];
+    const client = new MatrixClient(creds, createMockLogger(), {
+      minRequestIntervalMs: 0,
+      fetchImpl: vi.fn(async (url, init) => {
+        requests.push({
+          method: init?.method ?? 'GET',
+          url: String(url),
+          ...(init?.body ? { body: JSON.parse(String(init.body)) } : {}),
+        });
+        if (init?.method === 'GET') {
+          return new Response(JSON.stringify({
+            '@existing:example.test': ['!old:example.test'],
+            '@them:example.test': ['!already:example.test'],
+          }), { status: 200, headers: { 'content-type': 'application/json' } });
+        }
+        return new Response('{}', { status: 200, headers: { 'content-type': 'application/json' } });
+      }),
+    });
+
+    await expect(client.repairDirectRoomMappings([
+      { recipientMxid: '@them:example.test', roomId: '!already:example.test' },
+      { recipientMxid: '@them:example.test', roomId: '!new:example.test' },
+    ])).resolves.toBe(1);
+
+    expect(requests).toHaveLength(2);
+    expect(requests[1]).toMatchObject({
+      method: 'PUT',
+      body: {
+        '@existing:example.test': ['!old:example.test'],
+        '@them:example.test': ['!already:example.test', '!new:example.test'],
+      },
+    });
+  });
+});
+
 describe('MatrixClient authentication classification', () => {
   it('does not classify a room-level 403 as an expired account token', async () => {
     const client = new MatrixClient(creds, createMockLogger(), {