Throw SentMailboxNotSetException when sent mailbox not configured#30

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Copilot wants to merge 6 commits intomainfrom

copilot/investigate-sentmailboxnotsetexception

Commits on Feb 6, 2026

Initial plan
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Throw SentMailboxNotSetException with proper error handling and logging

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printminion-co
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Add STATUS_NO_SENT_MAILBOX constant and UI error message display

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Add proper import for SentMailboxNotSetException in Chain

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Address code review feedback: Add logging in Chain and fix capitalization

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Improve OutboxController error message for better user understanding

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