Release 0.8.1

[mwmdev]

Better Gmail and Proton Mail Bridge support, plus faster --limit. Full list in CHANGELOG.md under 0.8.1.

• Non-ASCII search works on servers with LITERAL- (Gmail) for terms up to 4096 bytes
• Non-ASCII folder names display decoded; folder options accept either form
• --all-folders skips \Noselect containers and folders inside Trash/Junk/All Mail; on Gmail a message with several labels is one row (INBOX copy first); on Proton Bridge the label views are skipped
• --limit narrows large searches to recently arrived mail before fetching headers (Gmail search --limit 5: 22.9 s to 1.6 s)
• Ordering caps the Date header at arrival + 1 day, so future-dated mail no longer pins itself to the top
• Release prep: version 0.8.1, changelog section, website version, date and download links

Verified locally: full CI (check incl. cargo package and cargo deny, MSRV 1.88, 60 GreenMail scenarios), a 22-check Dovecot 2.3 harness, and read-only checks against Gmail and Proton Mail Bridge 3.23.