fix: correct event type in partial final chunk test

Change TextMessageContentEvent to TextMessageChunkEvent in test to match
actual AG-UI protocol event types.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: contextablemark

typescript-sdk/integrations/adk-middleware/python/tests/test_adk_agent.py

@@ -148,8 +148,8 @@ async def test_partial_final_chunk_uses_streaming_translation(self, adk_agent, s
         async def fake_translate(self, adk_event, thread_id, run_id):
             nonlocal translate_calls
             translate_calls += 1
-            yield TextMessageContentEvent(
-                type=EventType.TEXT_MESSAGE_CONTENT,
+            yield TextMessageChunkEvent(
+                type=EventType.TEXT_MESSAGE_CHUNK,
                 message_id=adk_event.id,
                 delta="chunk"
             )
@@ -184,7 +184,7 @@ async def run_async(self, *args, **kwargs):
              patch.object(adk_agent, "_create_runner", return_value=FakeRunner()):
             events = [event async for event in adk_agent.run(sample_input)]
 
-        assert any(isinstance(event, TextMessageContentEvent) for event in events)
+        assert any(isinstance(event, TextMessageChunkEvent) for event in events)
         assert translate_calls == 1
         assert lro_calls == 0