feat(theme-selector): add a live mock Emacs frame for the interface faces

I split the interface-faces row into the face table on the left and a mock Emacs buffer on the right. The mock paints the faces in context: line numbers and fringe, a current line with hl-line and the current-line number, a region selection, an isearch match, a lazy-highlight, a show-paren match, a block cursor, active and inactive mode-lines, and a minibuffer prompt with an echo line for link, error, warning, and success. It rebuilds whenever a syntax or interface color changes, so it always reflects the current theme.

The face table told you each color. The mock shows what they look like together in a real buffer.

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