fix(auto-dim): dim the remaining org faces, and test for the next oneHEADmain

Four rounds of this bug had one shape: a face nobody enumerated, sitting ahead of a mapped face in a face list and outranking it. A table header renders as (org-table-header org-table), so the mapped org-table underneath never got a say.

So this round adds a test instead of another guess. It fontifies a representative org buffer, collects every face the buffer actually uses (including the line-prefix and wrap-prefix that org-indent hangs its faces on), and fails on anything neither mapped nor deliberately excluded. It caught org-checkbox while I was writing it.

Newly dimmed: org-table-header, org-formula, org-checkbox, org-checkbox-statistics-done, org-headline-done, org-drill-visible-cloze-face.

org-indent joins org-hide and org-superstar-leading on the -hide face. All three resolve to the background colour, which is what makes folded text, leading stars and indent prefixes invisible. Flat-dimming any of them reveals what I hid.

bold, italic and underline stay unmapped on purpose. They carry no foreground even through inheritance, so they take their colour from default and dim for free.

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