Fix levelGridVania size

[jobe-m]

Size of levelGridVania was wrongly calculated.

[augmentcode]

🤖 Augment PR Summary

Summary: Fixes incorrect levelGridVania sizing by distinguishing GridVania chunk dimensions from per-chunk tile dimensions.

Changes:

• Extend WorldMapData.init to accept and store gridVaniaWidth/Height
• Allocate levelGridVania using GridVania chunk counts instead of chunk tile sizes
• Update CommonChunkInfo docs and pass the new dimensions from AssetLoader

Technical Notes: World pixel size remains computed as chunks * tilesPerChunk * tileSize.

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[augmentcode]

Review completed. 2 suggestions posted.

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