LamMailBox

This is a light maintenance release that swaps LamMailBox onto the shared YskLib messaging helper and tidies a few internal workflows. Gameplay, commands, and configs behave exactly as before.

Updates ✨

• MessageManager integration (internal) – messages are now cached at startup via YskLib, trimming a little overhead when the plugin sends frequent notifications.
• Dual placeholder support everywhere – both {placeholder} and legacy %placeholder% formats are accepted across commands, GUIs, and config entries.
• Small responsiveness improvements from polishing GUI click handling and item rendering paths.

Fixes 🛠️

• Strengthened error handling in GUI click events to prevent potential edge-case issues
• Improved code maintainability to enable faster bug fixes in future releases

Changes 🔄

• Config version incremented to 1.7 to reflect the placeholder helper swap (existing %placeholder% lines remain valid—no edits required).
• YskLib dependency bumped to 1.6.4+ so the shared MessageManager feature is available.
• Internal GUI helpers were grouped into focused classes for navigation, pagination, styling, and command item composition to keep future maintenance simple.