Cache: Don't cache Blobs.

[Mugen87]

Fixed #32986.

Description

Blob URLs are not stable and change for a given resource every time URL.createObjectURL() is called. This behavior can introduce a memory leak in THREE.Cache since the URLs are part of the cache key.

Because the data of Blob URLs are already located at the client, no network transfer is required. Hence, Cache does not need to honor such URLs.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	359.14 85.24	359.14 85.24	+0 B +0 B
WebGPU	621.16 173.09	621.16 173.09	+0 B +0 B
WebGPU Nodes	619.74 172.84	619.74 172.84	+0 B +0 B

🌳 Bundle size after tree-shaking

Minimal build including a renderer, camera, empty scene, and dependencies.

	Before	After	Diff
WebGL	490.85 119.64	490.85 119.64	+0 B +0 B
WebGPU	694.85 188.15	694.85 188.15	+0 B +0 B
WebGPU Nodes	644.06 175.54	644.06 175.54	+0 B +0 B