PolyStorage

Fixes vanilla clients being kicked at join with 'This server requires Fabric Loader and Fabric API': the mod's custom data components are now hidden from registry sync, so a plain vanilla client connects cleanly. Adds full fallback visuals for players without the resource pack, including Bedrock players connecting through Geyser: vanilla stand-in blocks and items, tier-colored storage cells, real-item menu icons, and plain menu titles, so everything stays usable without the pack. Players with the pack see no change. Server setup: enable Polymer's resource pack auto-host by setting enabled to true in config/polymer/auto-host.json (it is off by default on dedicated servers) so joining players receive the custom look automatically. Verified end to end against a real vanilla 26.2 client and a Bedrock protocol client through Geyser.