Mercantile - Villager Overhaul

This beta tightens up bell and sentry pylon behaviour introduced in beta.1, with a handful of visual polish fixes to match.

Added

• Villagers within a bell's range now glow while you hold a bell, making it easy to see who's covered before you place it.
• The bell radius circle is now centred on the bell block itself rather than on your position.
• Idle sentries walk back to their pylon before despawning, giving you a visual heads-up instead of vanishing silently.

Fixed

• Bell radius and workstation-link particles were disappearing beyond 32 blocks due to a vanilla particle cap; both now render at full range.
• A sentry fighting an off-screen threat no longer despawns mid-combat.
• Redstone-disabling a pylon no longer caused it to keep scanning and keep its sentries alive indefinitely.
• Breaking a pylon now properly releases its sentries instead of leaving them stranded permanently.
• JEI recipe viewer integration was silently inactive; the plugin is now properly registered.