test: add layout alignment tests and clean up blank lines

Add tests verifying the new UI state: translate button is outside both
columns, no HTML elements remain. Remove extra blank lines left from
earlier test removals.

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

tests/test_app.py

@@ -178,6 +178,20 @@ def test_demo_has_translate_button(demo):
     assert any(b.value == "Translate" for b in buttons), "Expected a 'Translate' button"
 
 
+def test_translate_button_outside_columns(demo):
+    """Translate button should not be inside either Column."""
+    buttons = [b for b in demo.blocks.values() if type(b).__name__ == "Button" and b.value == "Translate"]
+    assert len(buttons) == 1
+    node = getattr(buttons[0], "parent", None)
+    while node is not None:
+        assert type(node).__name__ != "Column", "Translate button should not be inside a Column"
+        node = getattr(node, "parent", None)
+
+
+def test_demo_has_no_html_elements(demo):
+    """UI should have no HTML elements (hint/char count removed)."""
+    html_blocks = [b for b in demo.blocks.values() if type(b).__name__ == "HTML"]
+    assert len(html_blocks) == 0, f"Expected no HTML blocks, found {len(html_blocks)}"
 
 
 def test_translate_handlers_wire_text_and_language(demo):
@@ -188,10 +202,6 @@ def test_translate_handlers_wire_text_and_language(demo):
 
 
 
-
-
-
-
 def test_no_title(demo):
     """UI should not have an H1 title."""
     markdowns = [b for b in demo.blocks.values() if type(b).__name__ == "Markdown"]