Updates ✨

• Introduced automated mailings defined in mailings.yml, supporting cron-based schedules, first-join delays, permission gates, and Folia-safe delivery with automatic player notifications.
• Added the /lmb mailings admin command with live status reporting (last/next run previews, run counters) backed by YAML and SQLite repositories.
• Expanded the mail composer: schedule or expire deliveries via the GUI clock, build reusable console command bundles with the new command-item editor, and preview current receivers/messages directly in the interface.
• Upgraded /lmb send to accept inline sections (| [commands] | schedule:YYYY:MM:DD:HH:mm | expire:YYYY:MM:DD:HH:mm) so console and admins can queue timed or command-driven mail in one call.

Fixes 🛠️

• Blocked players from mailing themselves and added capacity checks before accepting new receivers to prevent overfilled mailboxes.
• Restricted bulk recipient and command attachment actions to admins, ensuring permission checks mirror the GUI workflow.
• Added sent-mail deletion confirmation and safeguarded composer/item GUI closures so items return to players instead of being lost.
• Normalized allonline targets to snapshot current online players before storage, ensuring scheduled deliveries reach the correct recipients.

Changes 🔄

• Bumped configuration schema to 1.4 with expanded messages, titles, and GUI metadata plus the new mailings.auto-cleanup toggle for status pruning.
• Mail records now capture optional schedule and expiry timestamps, defaulting expiration from settings.default-expire-days when unspecified.
• Command attachments persist as structured "command items" (YAML command-items section or SQLite mail_command_items table) while retaining legacy command lists for backward compatibility.

Notes 📌

• Cron expressions follow the UNIX format (m h dom mon dow); disable any definition by setting enabled: false.
• mailings.yml is generated on first run—review default examples before enabling automation in production.
• Back up your YAML/SQLite data before upgrading; the plugin will auto-create the new mail_command_items/mailing_status tables and mailing-status.yml file on startup.
• Reloading via /lmbreload refreshes mailing definitions, runs auto-cleanup, and reports active IDs for quick verification.