Fix blob SAS when using version 2026-04-06

[Socolin]

This should fix #2649

The SDK is generating signature with new parameters

https://github.com/Azure/azure-sdk-for-net/blob/main/sdk/storage/Azure.Storage.Common/src/Sas/SasQueryParameters.cs#L103-L107

https://github.com/Azure/azure-sdk-for-net/blob/main/sdk/storage/Azure.Storage.Blobs/src/Sas/BlobSasBuilder.cs#L573-L574

# SDK
        // r\n2026-06-15T17:46:26Z\n2026-06-22T17:46:26Z\n/blob/dev/some-container-name/abc.png\n7c751eb2-acf8-4ce2-b92c-8724f0644194\nff51635d-1eb2-4fe3-8828-0c3de5b45b35\n2026-06-15T17:46:26Z\n2026-06-15T18:46:26Z\nb\n2025-11-05\n\n\n\n\n\n\n\n2026-04-06\nb\n\n\n\n\n\n\n\n\n
# Azurite
        // r\n2026-06-15T17:46:26Z\n2026-06-22T17:46:26Z\n/blob/dev/some-container-name/abc.png\n7c751eb2-acf8-4ce2-b92c-8724f0644194\nff51635d-1eb2-4fe3-8828-0c3de5b45b35\n2026-06-15T17:46:26Z\n2026-06-15T18:46:26Z\nb\n2025-11-05\n\n\n\n\n\n\n\n2026-04-06\nb\n\n\n\n\n\n\n

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Adds support for User Delegation Key (UDK) Blob SAS signing and parsing for service version 2026-04-06, including new optional signed request headers/query parameters.

Changes:

• Extended IBlobSASSignatureValues with signedRequestHeaders / signedRequestQueryParameters.
• Added a new 2026-04-06 string-to-sign implementation for generateBlobSASSignatureWithUDK.
• Updated SAS request parsing to read srh / srq query params and changelog entry.

Reviewed changes

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

File	Description
src/blob/authentication/IBlobSASSignatureValues.ts	Adds new SAS fields and introduces a new signing function for version 2026-04-06.
src/blob/authentication/BlobSASAuthenticator.ts	Parses new query parameters (srh, srq) and wires them into the in-memory SAS values.
ChangeLog.md	Documents upcoming release support for 2026-04-06 delegation SAS.

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