🪲 BUG-#64: Honor port and ssl flag in ImapClient.connect

[FernandoCelmer]

Summary

• ImapClient.connect() now uses self.port and switches between imaplib.IMAP4_SSL and imaplib.IMAP4 based on self.ssl
• Unblocks providers like ProtonMail Bridge (127.0.0.1:1143, ssl=False) and IMAP over STARTTLS on port 143
• Tests assert correct class + port for ssl=True, ssl=False, and custom SSL ports

Closes #64

Test plan

• pytest tests/clients/imap/test_connect.py — 3 passed

[FernandoCelmer]

🔍 Code Review

Code issues found: 0

Straightforward and correct. Honors port and ssl flags, type annotation widened to Optional[imaplib.IMAP4] (which is the parent of IMAP4_SSL). Tests assert the exact class + port for ssl=True, ssl=False, and a non-993 SSL port — that's the right matrix.

This unblocks the ProtonMail Bridge entry in providers.py and any user pointing at imap.<host>:143 over STARTTLS.

Closes #64.