refactor(theme-studio): table-drive vibe chroma and share the inherit walk

vibeChroma was a ten-branch if-ladder of magic chroma constants; it's now a [base, range] lookup table, so a vibe is one row to read or tune. resolveSyntaxFg and resolveUiAttr each hand-rolled the same cycle-guarded inherit walk; both now call one walkInheritChain helper that takes the parent and value functions. effResolve keeps its own recursive form since it double-indexes through the package map.

I left the palette-actions splice helpers (replacePaletteEntries, withCfg) and the paletteGroups dedup for a later pass: they mutate the live palette and are only browser-gate covered, so they want their own careful change rather than riding this one.

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