feat: update main chat and system chat UI

tests/mainChatPanel/messageParts.test.ts

@@ -32,3 +32,36 @@ test('extractChatMessageParts does not promote relative internal resource markdo
     },
   );
 });
+
+test('extractChatMessageParts keeps angle-bracket internal resource markdown links as plain text', () => {
+  assert.deepEqual(
+    extractChatMessageParts(
+      ['문서 경로', '[채팅방 참고 문서](</api/chat/resources/.codex_chat/chat-room/resource/source/chat room reference.md>)'].join(
+        '\n',
+      ),
+    ),
+    {
+      strippedText: ['문서 경로', '[채팅방 참고 문서](</api/chat/resources/.codex_chat/chat-room/resource/source/chat room reference.md>)'].join(
+        '\n',
+      ),
+      parts: [],
+    },
+  );
+});
+
+test('extractChatMessageParts promotes standalone markdown links with angle-bracket external targets into link cards', () => {
+  assert.deepEqual(
+    extractChatMessageParts(' - [판매글 열기](<https://www.daangn.com/kr/buy-sell/mac studio>)'),
+    {
+      strippedText: '',
+      parts: [
+        {
+          type: 'link_card',
+          title: '판매글 열기',
+          url: 'https://www.daangn.com/kr/buy-sell/mac studio',
+          actionLabel: null,
+        },
+      ],
+    },
+  );
+});