fix(core): store assets as raw bytes instead of File objects in Index…

[DoudouDoudouk]

…edDB

saveAsset put the File itself into IndexedDB. Not every engine accepts File/Blob records (WebKit rejects the write), so every upload that goes through saveAsset failed there with no fallback.

Store { assetVersion: 1, bytes, type } instead, which uses the portable structured-clone path. loadAssetUrl rebuilds a Blob from that record, still reads File/Blob records written before this change, and returns null for an unreadable record instead of throwing inside createObjectURL.

What does this PR do?

How to test

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Checklist

• I've tested this locally with bun dev
• My code follows the existing code style (run bun check to verify)
• I've updated relevant documentation (if applicable)
• This PR targets the main branch

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Note

Medium Risk
Changes how all local asset uploads are persisted and loaded, but behavior stays the same for callers and legacy data is still supported.

Overview
Fixes asset uploads failing on engines (notably WebKit) that reject storing File/Blob values in IndexedDB.

saveAsset now persists a versioned record { assetVersion: 1, bytes, type } instead of the File itself, using structured-clone-friendly ArrayBuffer data while preserving MIME type for later blob URLs.

loadAssetUrl reconstructs a Blob from that record via a new toBlob path, still reads legacy File/Blob entries written before this format, and returns null (with a warning) for corrupt or unexpected records instead of blowing up in createObjectURL.

Tests cover the new storage shape, backward compatibility, and unreadable-record handling.

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