Add block-to-mesh mapping system for improved mesh tracking

[tracygardner]

Summary

This PR introduces a comprehensive block-to-mesh mapping system to replace inefficient object lookups. The changes add three new Map-based data structures to track relationships between blocks, block IDs, and their associated meshes, along with a registration function to maintain these mappings.

Key Changes

• New mapping structures: Added blockToKeyMap, blockIdToKeyMap, and blockKeyMeshesMap to provide O(1) lookup performance instead of O(n) array searches
• Registration function: Implemented registerMeshForBlockKey() to centralize mesh registration across all mesh creation points
• Generator updates: Updated all 20+ block generator definitions to populate the new mapping structures whenever meshes are created
• Lookup optimization: Refactored getBlockKeyFromBlock(), getBlockKeyFromBlockID(), getMeshFromBlockKey(), and getMeshesFromBlockKey() to use Map lookups instead of array filtering
• Disposal handling: Enhanced getMeshFromBlockKey() and getMeshesFromBlockKey() to filter out disposed meshes
• Cleanup: Updated deleteMeshFromBlock() to properly clean up all three mapping structures
• Initialization: Reset all three maps in both init() and init2() generator initialization functions

Implementation Details

• The blockKeyMeshesMap uses a Set to handle multiple meshes per block key
• All mesh creation APIs (shapes.js, csg.js, camera.js, mesh.js) now call registerMeshForBlockKey() to maintain consistency
• The mapping system is initialized fresh on each generator initialization to prevent stale references
• Disposed mesh filtering ensures only active meshes are returned from lookup functions

https://claude.ai/code/session_011y6sJ1hJUwznDNwHzcphiQ

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