[GGUF] buildGgufHeader support streaming blobs (WebBlob/XetBlob)#1762
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[GGUF] buildGgufHeader support streaming blobs (WebBlob/XetBlob)#1762
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Problem: buildGgufHeader #1759 was failing with RangeError: Offset is outside the bounds of the DataView when using streaming blobs (WebBlob/XetBlob) because it tried to slice them without awaiting the data.
Solution: Added await originalTensorInfoBlob.arrayBuffer() to properly fetch tensor info data from streaming blobs before combining with new header.
Why needed: This enables efficient GGUF metadata editing with SplicedBlob and streaming downloads, avoiding the need to download entire large files upfront. Critical for the optimized commit workflow in hub package.