v0.4.1-beta

First beta: MVP + all planned post-MVP features (Restock, Quick Stack,
shulker boxes) are done on both Fabric and NeoForge. No functional changes
from 0.4.0-alpha - this release marks a shift in confidence, not new
features, ahead of real dedicated-server testing.

Changed

• Replaced the placeholder "ES" icon with a real one (chest + sparkle) on
  both Fabric and NeoForge.