feat(theme-selector): near-complete face coverage in org/magit/elfeed previews

The org preview now exercises 83 of 88 org faces (document plus agenda view); the five it skips are non-visual (org-hide, org-indent, org-clock-overlay, org-default, org-date-selected). Magit covers 97 of 98 across a status buffer plus labeled sampler rows for the long tail (diff variants, reflog, rebase sequence, bisect, blame, signatures, cherry). Elfeed now covers all 13. So clicking a face row flashes a real preview element for nearly every face instead of falling back to the row cell.

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