feat(theme-selector): bespoke previews for ghostel, mu4e, and dashboard

These three no longer fall to the generic face-name list. ghostel renders a mock terminal covering all 19 faces (the 16 ANSI colors, default, and the fake cursor). mu4e renders a headers list, message view, and compose stub covering all 37 of the faces the dupre theme themes; mu4e is absent from the generated inventory, so its face list is curated. dashboard covers all 8. Every face has a real preview element, so the click-to-flash linking works both directions with no fallback.

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