[browser][coreCLR] Fix loadBootResourceCallback receiving undefined integrity and refactor config merge

[pavelsavara]

Summary

This PR fixes a bug where the loadBootResourceCallback was always receiving undefined for the integrity parameter, and refactors the loader config merge logic for correctness and clarity.

Changes

Bug fix: integrity parameter in loadBootResourceCallback

The AssetEntryInternal.integrity field was never assigned anywhere in the codebase, so both call sites in assets.ts that passed assetInternal.integrity! to loadBootResourceCallback were always passing undefined. The fix replaces this with assetInternal.hash ?? "", using the hash field from the base AssetEntry type which is actually populated from the asset manifest. The dead integrity field is removed from AssetEntryInternal.

Config merge refactor (mergeResources / mergeConfigs)

The old mergeResources wrote merged values into source, then used Object.assign(target, source) to copy everything back to target. This was:

• Fragile: Object.assign overwrote the already-merged resources object on target with the unmerged one from source.
• Error-prone for satellite resources: Required two separate loops — one for source keys and one for target-only keys — because target was being replaced wholesale.

The new code writes directly to target, which:

• Eliminates the need for the second satellite resources loop (target-only keys are already there).
• Uses || [] fallbacks on source arrays for defensive handling of partial Assets objects.
• Adds hash merge for the top-level Assets.hash manifest hash.

In mergeConfigs, the merged target.resources is saved before Object.assign(target, source) and restored afterward, so the scalar property copy doesn't overwrite the already-merged resources.

Missing coreVfs handling

The coreVfs field existed on the Assets type but was missing from both mergeResources and normalizeResources. Both functions now handle it.

[Copilot]

Pull request overview

Updates the browser/CoreCLR JavaScript loader configuration and asset handling to improve config merging and align asset metadata with the public API (hash/integrity handling).

Changes:

• Adjust config merging to mutate the target config/resources directly (and add coreVfs normalization/merge).
• Switch loadBootResourceCallback integrity argument from asset.integrity to asset.hash.
• Remove integrity from internal asset entry typings.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
src/native/libs/Common/JavaScript/types/internal.ts	Removes internal integrity field from AssetEntryInternal to rely on AssetEntry.hash.
src/native/libs/Common/JavaScript/loader/config.ts	Reworks config/resource merge behavior; adds coreVfs normalization and merges resources.hash.
src/native/libs/Common/JavaScript/loader/assets.ts	Passes asset.hash into loadBootResourceCallback where integrity was previously used.

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated no new comments.