Introduce Inbox struct to track the oldest fetched sequence number.
When scrolling past the last email, automatically fetch the next
batch of 50 older messages and append them to the list.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Support both plain and TLS IMAP connections via an ImapSession enum,
enabling use with Gmail and other TLS-only servers. Limit fetch range
to the most recent 50 messages to avoid hanging on large mailboxes.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Replace simple IMAP login with full inbox fetch that displays
Subject, From, and Date for each message. Auto-refreshes every
30 seconds and supports manual refresh with 'r' key.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
