Hide transcoded originals from non-admins; mark them visually for admins

update.rb records transcoded_to in album.json (even on re-runs where
the MP4 already exists) so the marker survives across scans.

app.rb filters files with transcoded_to from non-admin views.
album.erb renders them greyed-out with an amber "⚠ original" badge in
admin mode. admin/album.erb marks the edit-table row and shows the
target filename under the original.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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