feat(theme-studio): scenes for pinned ghostel and all-the-icons

ghostel (the terminal behind the agent buffers) gets an eat-style scene through its own 16 ANSI color faces plus the default surface and the two fake-cursor faces; all-the-icons a dired listing where each file's leading marker carries its color face across the 8 hues, their light/dark variants, and the -alt accents. Both are pinned not-loaded apps whose only visibility is the studio preview, so they carry the highest realism bar. Face names are literal, not constructed, to satisfy the coverage gate.

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