d97c74ae

Author: Michael Lynch <git@mtlynch.io>

Committer: Michael Lynch <mtlynch@noreply.codeberg.org>

Extract generateThumbnail into images.GenerateSquareThumbnail (#90)

Moves thumbnail logic into a new images package with a buffer-based API
(io.Reader/io.Writer) and a sizeInPx parameter, decoupling it from file I/O.

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

Reviewed-on: https://codeberg.org/mtlynch/little-moments/pulls/90
Co-authored-by: Michael Lynch <git@mtlynch.io>
Co-committed-by: Michael Lynch <git@mtlynch.io>