fix(decorations): drop warp_helmet (Clyde-visor design)

Same Discord Clyde-visor artwork as the helmets excluded in 78b1a2ff.
Anyone who had it equipped now shows no decoration: the slug no longer
passes isValidDecorationSlug.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA

src/app/features/lotus/avatarDecorations.ts

@@ -71,7 +71,6 @@ export const DECORATION_CATEGORIES: DecorationCategory[] = [
       { slug: 'solar_orbit', name: 'Solar Orbit' },
       { slug: 'astronaut_helmet', name: 'Astronaut Helmet' },
       { slug: 'ufo', name: 'UFO' },
-      { slug: 'warp_helmet', name: 'Warp Helmet' },
       { slug: 'aurora', name: 'Aurora' },
     ],
   },