Simple Vein Miner [DISCONTINUED]

This update addresses a global gamerule side-effect introduced in v2.0.0, fixes a Silk Touch drop duplication bug in the vein breaker, and improves the welcome message and toggle feedback for a clearer in-game experience.

• Removed global gamerule showtags false call — this command was being executed server-wide every time a new player joined for the first time, silently affecting all players in the world.
• Fixed Silk Touch drop duplication — the previous fallback from spawnItem to setblock air destroy could generate duplicate drops. The block is now removed with setblock air first, then the item is spawned with no risky fallback.

• Improved welcome message — replaced the single generic line with three clear lines covering controls: equipping a pickaxe, the sneak + right-click toggle, and the config item.
• Distinct toggle sounds & icons — enabling now plays random.orb + note.pling and shows ✔ Enabled in green; disabling plays random.click + note.bass and shows ✖ Disabled in red. Previously both states shared a single sound with no icon.