feat(palette): sixteen ANSI colour ladders, cycled with c

README.md

@@ -84,6 +84,11 @@ implemented here from public endpoints and open protocols.
   lock screens, `playerctl` and the media keys pick it up. On macOS the audio
   engine (mpv) publishes to the system **Now Playing** session, so Control
   Center, the menu bar and the keyboard media keys drive the app the same way.
+- **Sixteen palettes** — every colour comes from one ladder of ANSI names per
+  theme: the spectrum analyser, the album-art mosaic, the provider wordmarks
+  and the pane corners all draw from it. `c` cycles spectrum, rainbow, ocean,
+  ember, mint, sunset, violet, acid, neon, sand, blood, forest, ice, steel,
+  candy and mono; the choice is remembered.
 - **Theme-aware** — every accent is emitted as native ANSI (not RGB), and the
   background is the terminal default (`SGR 49`), so transparent terminals stay
   transparent and the TUI adopts your shell/terminal colour scheme.
@@ -350,6 +355,7 @@ The UI wants roughly **84×24**; it also works smaller, just less pretty.
 | `/`            | filter by title, genre, description           |
 | `esc`          | clear filter / close search                   |
 | `v`            | visualiser: mirror → bars → wave → waterfall → radial → braille |
+| `c`            | colour palette (16 of them, remembered)       |
 | `r`            | refresh stations, schedule + song history     |
 | `p`            | switch station catalogue (SomaFM / tilderadio)|
 | `g` / `G`      | top / bottom                                  |