FEAT: Server-side filters via Sieve (ManageSieve)

[andrinoff]

Is your feature request related to a problem?

Matcha cannot manage server-side mail filters.

Describe the solution you'd like

Support reading and editing Sieve scripts over ManageSieve for servers that offer it.

Describe alternatives you've considered

Client-side rules only.

Additional context

New protocol client alongside backend/imap; UI under tui/settings_*.

[floatpanebot]

Thanks for the suggestion!

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[floatpanebot]

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