feat(theme-studio): bucket unrecognized faces by their defface source

A newly-loaded package (or a new built-in face) used to fall into emacs-core because grouping is by name-prefix and an unknown prefix matched nothing. Now the fallback routes by where the defface lives: an elpa face becomes its own package bucket, a built-in face a new emacs-general child. So loading a package and running make face-coverage surfaces it as a fresh TODO bucket instead of an orphan in core. Recognized faces still match their family first, and faces.el/frame.el faces stay in emacs-core.

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