feat(skins): add brookie — barbie-pink coquette theme

Adds a built-in 'brookie' skin preset inspired by brooklyn.sh's
signature hot-pink palette. Features:

- Hot pink (#FF3366) borders with Barbie-pink (#FF69B4) accents
- Lavender-blush (#FFF0F5) text on deep-plum (#2A0E1E) surfaces
- Coquette spinner verbs (sparkling, twirling, tying a little bow)
- Heart/sparkle/flower spinner faces (♡ ✧ ✿ ❀ ෆ)
- Heart (♡) prompt symbol and tool prefix
- (ﾉ◕ヮ◕)ﾉ*:･ﾟ✧ kaomoji in welcome + help header
- Custom BROOKIE banner_logo in pink gradient
- Custom heart/bow banner_hero with sparkle + brooklyn.sh kaomoji

Also updates the module docstring and skins.md docs table.

website/docs/user-guide/features/skins.md

@@ -41,6 +41,7 @@ display:
 | `poseidon` | Ocean-god theme — deep blue and seafoam | `Poseidon Agent` | Deep blue to seafoam gradient. Ocean-themed spinners ("charting currents", "sounding the depth"). Trident ASCII art banner. |
 | `sisyphus` | Sisyphean theme — austere grayscale with persistence | `Sisyphus Agent` | Light grays with stark contrast. Boulder-themed spinners ("pushing uphill", "resetting the boulder", "enduring the loop"). Boulder-and-hill ASCII art banner. |
 | `charizard` | Volcanic theme — burnt orange and ember | `Charizard Agent` | Warm burnt orange to ember gradient. Fire-themed spinners ("banking into the draft", "measuring burn"). Dragon-silhouette ASCII art banner. |
+| `brookie` | Barbie-pink coquette theme — sparkles, bows, and bubblegum (inspired by brooklyn.sh) | `Brookie` | Hot pink (`#FF3366`) borders with Barbie-pink (`#FF69B4`) accents and lavender-blush text. Coquette spinner verbs ("sparkling", "twirling", "tying a little bow"). Heart (♡) prompt symbol, sparkle-kaomoji greeting. Inspired by [brooklyn.sh](https://brooklyn.sh). |
 
 ## Complete list of configurable keys