docs(visualizer): document the six visualiser modes

README.md

@@ -19,7 +19,9 @@ implemented here from the public SomaFM endpoints and open protocols.
 
 - **Live spectrum analyser** — 72 log-spaced bands with peak caps, a moving
   gradient taken from your terminal's ANSI palette and a symmetric mirrored
-  spectrum; or a full-height oscilloscope. Three modes (`v`).
+  spectrum. Six modes (`v`): mirrored bars, plain bars, oscilloscope,
+  scrolling waterfall spectrogram, a radial spectrum wrapped around the
+  centre, and a high-resolution braille oscilloscope (2×4 dots per cell).
 - **Synced spectrum, not a guess** — by default the analyser records your
   actual audio output, so the bars follow what you hear (`SYNC`): the
   PulseAudio/PipeWire monitor via `parec` on Linux, and a native Core Audio
@@ -191,7 +193,7 @@ The UI wants roughly **84×24**; it also works smaller, just less pretty.
 | `f`            | favourite (favourites sort to the top)        |
 | `/`            | filter by title, genre, description           |
 | `esc`          | clear filter / close search                   |
-| `v`            | visualiser: mirrored bars → bars → wave       |
+| `v`            | visualiser: mirror → bars → wave → waterfall → radial → braille |
 | `r`            | refresh channels + song history               |
 | `g` / `G`      | top / bottom                                  |
 | `?`            | help                                          |