feat(theme-selector): show every ui face in the mock frame

The live buffer preview was incomplete. It skipped highlight, isearch-fail, show-paren-mismatch, and vertical-border, and the fringe was painted its ground-colored default so it read as absent. The mock now renders all twenty ui faces: a highlighted line, a failing isearch in the echo area, a mismatched paren, and a vertical-border strip down the buffer's right edge. The fringe column is wider with a hairline edge so the gutter is locatable even at ground color, and the buffer runs a dozen lines to fit everything.

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