70a7b15c

By: Michael Lynch <git@mtlynch.io>

Add unit tests for importers/images.go and importers/media.go

Refactor GenerateAndWriteSquareThumbnail, GenerateAndWriteResized, and
ImportMedia to accept io.Writer instead of (mediaDir, destFilename
string), so tests can pass a bytes.Buffer without touching the
filesystem.

The GIF-to-AVIF path in ImportMedia still requires a real file path for
ffmpeg, so convertGIFToAnimatedAVIF now writes to a temp file then
copies the result into the provided writer.

Update the single caller (cmd/import-from-tinybeans/main.go) with a
createAndWrite helper that creates the destination file and passes it
as the writer.

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

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