docs(visualizer): document the six visualiser modes

somafm_tui/widgets/help.py

@@ -25,7 +25,10 @@ HELP_ROWS: tuple[tuple[str, str], ...] = (
     ("f", "favourite — favourites float to the top"),
     ("/", "filter stations by title, genre or description"),
     ("esc", "clear the filter / close overlays"),
-    ("v", "cycle visualiser: mirrored bars → bars → wave"),
+    (
+        "v",
+        "cycle visualiser: mirror → bars → wave → waterfall → radial → braille",
+    ),
     ("r", "refresh station list and song history"),
     ("g / G", "jump to the top / bottom of the list"),
     ("? ", "this help"),