feat(theme-studio): previews render the chosen face height

heightCssValue maps a face's height to CSS from its stored kind: a relative multiplier renders as em, an absolute 1/10pt value as true pt, with legacy objects falling back to integer/fractional inference. uiCss feeds it to the mock editor, so the mode-line, mode-line-inactive, and line-number bars visibly thicken with an absolute height while the buffer text stays put; paintUI scales the UI row's sample text; the package-preview span builder swaps its em-only sizing for the same kind-aware value.

faceCss now accepts a unit-carrying string for fontSize alongside the existing em number.

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