The data layer, background sync, and IDLE already handled N accounts; this makes
the UI account-aware.
- Mailbox: filter chips (All + one per account) appear once 2+ accounts exist, and
each message in the unified view is labelled with its account. The filter resets to
All if the selected account is removed.
- Reply now carries the receiving account through to compose, so From defaults to the
account that received the message rather than just the first account.
- Removing an account now also deletes its cached messages and attachments, so they
leave the unified inbox.
- assemble/test/lint green; verified on the Android 17 emulator — added a second
GreenMail account, saw both accounts' mail unified + attributed, filtered to one
account, and replied from the correct account.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
JMR-devandClaude Opus 4.8
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