v0.24.1: bpm box in line with the now-playing panel

The boxed controls were centered on the whole bar while the now-playing
panel hung from its top, so the bpm box sat ~11px below the panel beside
it. The panel is now CONTROL_HEIGHT tall and every control shares its top
edge; the seek row hangs under the panel.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/test_round62.py

@@ -0,0 +1,26 @@
+"""Round 62: the bpm box lines up with the rest of the transport bar.
+
+The boxed controls (transport, shuffle, visualizer, bpm) were centered on the
+whole bar while the now-playing panel hung from its top, so the bpm box sat
+~11px lower than the panel right beside it. Now the panel is CONTROL_HEIGHT
+tall and every control shares its top edge; the seek row sits under the panel.
+"""
+
+from tests.test_round21 import _build_bar
+from lintunes.gui.transport import CONTROL_HEIGHT
+
+
+def test_every_control_shares_the_now_playing_row(qapp, tmp_path):
+    bar = _build_bar(qapp, tmp_path)
+    panel = bar._now_playing.geometry()
+    assert panel.height() == CONTROL_HEIGHT
+    for widget in (bar._prev_btn.parentWidget(), bar._shuffle_btn.parentWidget(),
+                   bar._visualizer, bar._volume_slider,
+                   bar._bpm_button.parentWidget()):
+        g = widget.geometry()
+        assert (g.top(), g.bottom()) == (panel.top(), panel.bottom())
+
+
+def test_seek_row_hangs_under_the_panel(qapp, tmp_path):
+    bar = _build_bar(qapp, tmp_path)
+    assert bar._slider.geometry().top() > bar._now_playing.geometry().bottom()