Nik Clayton 941f4677eb
fix: Show previews for playable audio media from accounts (#460)
Previous code showed a generic placeholder for audio media on the
account's "Media" tab.

Fix this so the preview image is shown (if it's available).

- Move the "is this attachment previewable?" code to `Attachment` so it
can be reused here.

- Restructure the logic in `AccountMediaGridAdapter` to use the new
`isPreviewable()` method when deciding whether to show a preview.

- Attachments have dedicated placeholder drawables, use those when the
preview is not available.
2024-02-20 16:20:34 +01:00
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