feat: Add notification email compression feature
Add intelligent notification email detection and compression:
- Detect notification emails from GitLab, GitHub, Jira, Confluence, Datadog, Renovate
- Extract structured summaries from notification emails
- Compress notifications into terminal-friendly markdown format
- Add configuration options for notification compression mode
Features:
- Rule-based detection using sender domains and subject patterns
- Type-specific extractors for each notification platform
- Configurable compression modes (summary, detailed, off)
- Integrated with ContentContainer for seamless display
Files added:
- src/mail/notification_detector.py: Notification type detection
- src/mail/notification_compressor.py: Content compression
Modified:
- src/mail/config.py: Add notification_compression_mode config
- src/mail/widgets/ContentContainer.py: Integrate compressor
- src/mail/app.py: Pass envelope data to display_content
- PROJECT_PLAN.md: Document new feature
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