feat(theme-studio): add mode-line-highlight as an editable face

The mode-line hover box (the raised bevel on clickable mode-line segments) came from mode-line-highlight, a face the studio never managed, so it fell through to Emacs's stock released-button default with no way to change it.

I added it to the generated UI face list, between mode-line and mode-line-inactive. The row and box control are already generic over that list, so they appear automatically. build-theme.el's UI emission is generic too, so the elisp side needs nothing.

The face isn't in the captured Emacs snapshot, so apply_hover_box_default seeds its box to the raised default in both build_uimap branches. That matches current behavior and leaves the user free to flatten or recolor it. The mock frame previews the hover by wrapping a mode-line segment in the face.

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