test: add button wiring test and remove stale comments

Add test verifying translate button only wires text and language inputs.
Remove leftover task section comments from previous implementation.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/test_app.py

@@ -35,9 +35,6 @@ def test_translate_accepts_generation_params():
     assert "temperature" in params
 
 
-# --- Task 1: Signature default + device tests ---
-
-
 def test_translate_signature_defaults():
     """translate() should have correct default values for generation parameters."""
     import inspect
@@ -122,6 +119,14 @@ def test_demo_has_translate_button(demo):
     assert any(b.value == "Translate" for b in buttons), "Expected a 'Translate' button"
 
 
+def test_translate_button_wires_only_text_and_language(demo):
+    """Translate button should only wire input text and target language (no sliders)."""
+    assert len(demo.fns) == 1, f"Expected 1 event handler, found {len(demo.fns)}"
+    fn = list(demo.fns.values())[0]
+    input_types = [type(i).__name__ for i in fn.inputs]
+    assert input_types == ["Textbox", "Dropdown"], f"Expected [Textbox, Dropdown], got {input_types}"
+
+
 # --- Slow tests (require CUDA + model download) ---
 
 gpu_available = torch.cuda.is_available()
@@ -174,9 +179,6 @@ def test_translate_returns_string(loaded_app):
     assert len(result) > 0
 
 
-# --- Task 6: Slow tests for non-default params ---
-
-
 @pytest.mark.slow
 @pytest.mark.skipif(not gpu_available, reason="Requires CUDA")
 def test_translate_with_beam_search(loaded_app):