- Parse attachment metadata while fetching a message body (ImapClient walks the MIME
tree, collecting parts with a filename or attachment disposition in a stable order);
a new fetchAttachment(uid, partIndex) downloads one part's bytes on demand.
- Persist attachment metadata in a new Room `attachments` table (entity + DAO +
MIGRATION_3_4, DB v4), populated when a message is opened so it survives re-opens.
- Reader shows an Attachments section (filename, size, type badge); tapping downloads
the part to a cache file and opens it in a system viewer via a FileProvider content
URI (ACTION_VIEW), with a snackbar when the download fails or no app can open it.
- assemble/test/lint green; verified on the Android 17 emulator against GreenMail —
a PNG-attachment message rendered the attachment, and tapping it fetched the exact
1049-byte file into the cache and dispatched an image/png VIEW intent.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
JMR-devandClaude Opus 4.8
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