Chore
- Limit maximum MIME parts parsed per message to 500
- Refactor regex usage for string cleaning and normalization
- Optimize envelope parsing by using a shared parser instance
- Optimize message summary construction by eliminating JSON round-trip
- Replace bytes.ToLower with containsFold for case-insensitive tag matching
- Replace inline regex for leading whitespace with a package-level variable
- Symlink sendmail to Mailpit in Docker image (#736)
- Update Go dependencies
- Update node dependencies
- Update GitHub Actions dependencies