6114451e

Simplify MediaItem.Filenames() with a per-type spec table

Replace two separate switches on MediaType (one for the full-size
extension, one for thumbnail/display filenames) with a single spec
table, removing duplicate thumbnail-building code shared by
MediaTypeImage and MediaTypeImageAnimated.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

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