feat(theme): seven theme preset data files (presets-pack)

[IceboxDev]

Adds the presets-pack unit of the site-wide personalization batch: seven self-contained theme preset data files under packages/web/src/lib/theme/presets/ (dawn, ocean, ember, terminal, cyberpunk, sakura, nord), to be discovered by the theme engine via import.meta.glob.

• Each file is a plain-object default export with no imports, following the engine's runtime contract (surface ramp, fg ramp, accent + neon trio, pattern, radii, avatar/selection, font, ambient, accentMode).
• Palettes ported from the Icebox theme presets, mapped onto BoardGames token roles; Dawn is a new lightest-viable dark design (warm-tinted surfaces, doodles pattern, no ambient).
• Contrast verified arithmetically: fgPrimary vs surface950 >= 7:1 and fgMuted vs surface900 >= 3:1 for all seven.
• presets-pack.test.ts asserts the contract shape (exact key set, lowercase 6-digit hexes, opacity/radius/font ranges, enum values, unique keys and orders) with no engine imports.
• Orders 3-9 (ocean fixed at 4 per spec), leaving 1-2 for the engine-owned classic/midnight presets. No existing files touched.

🤖 Generated with Claude Code

https://claude.ai/code/session_011r16ejkf3HB6tyZfTeA3Eb

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Project	Deployment	Actions	Updated
board-games-server	Ready	Preview	Sep 3, 2026 11:43pm UTC