fix(ui): keep the help and catalogue menus inside the screen

tests/test_schedule.py

@@ -164,3 +164,25 @@ def test_upcoming_rows_count_the_shows_they_had_to_hide() -> None:
     listed = sum(1 for line in lines if "show " in line)
     hidden = int(lines[-1].split("+")[1].split()[0])
     assert listed + hidden == 30
+
+
+@pytest.mark.asyncio
+async def test_long_show_names_stay_inside_the_pane() -> None:
+    """Regression: the schedule's row maths used to overshoot by two cells."""
+    app = BeefyPlayerApp(provider="tilderadio", offline=True, audio=False)
+    async with app.run_test(size=(80, 30)) as pilot:
+        await pilot.pause()
+        now = datetime.now(timezone.utc)
+        app.schedule = [
+            Broadcast(
+                name="A Very Long Show Name That Would Never Fit In The Pane",
+                start=now + timedelta(hours=index + 1),
+                end=now + timedelta(hours=index + 2),
+            )
+            for index in range(6)
+        ]
+        app.schedule_loaded = True
+        panel = app.query_one(SchedulePanel)
+        rows = [line.plain for line in panel.render().renderables]
+        assert all(len(row) == panel.size.width for row in rows)
+        assert all(row.startswith(("│", "╭", "╰")) for row in rows)