areamonitor

GUI Management, Polygon Selection, Protection System, Trigger System

- New floating-window GUI management interface (Glass Morphism theme) with 4 sub-panels (Area Edit / Whitelist / Restrictions / Triggers)
- New polygon area selection (3-32 vertices, ray-casting collision detection)
- New 6 protection types (block break/place/interact, PVP, explosion, entity damage) + container interaction + fluid placement + item drop protection
- New enter/leave independent trigger configs (commands/sounds/titles/cross-dimension teleport)
- New scheduling, export/import/clone, statistics, and config backup features
- New template system, confirm dialogs, toast notifications, protection violation particles
- Numerous null-safety fixes, translation key cleanup, and layout alignment improvements