fix(cornerstone): read FrameOfReferenceUID from display set in viewport service

[GhadeerAlbattarni]

Context

• Use displaySet.FrameOfReferenceUID instead of displaySet.frameOfReferenceUID in CornerstoneViewportService._getFrameOfReferenceUID.

Changes & Results

Testing

Checklist

PR

• [] My Pull Request title is descriptive, accurate and follows the
  semantic-release format and guidelines.

Code

• [] My code has been well-documented (function documentation, inline comments,
  etc.)

Public Documentation Updates

• [] The documentation page has been updated as necessary for any public API
  additions or removals.

Tested Environment

• [] OS:
• [] Node version:
• [] Browser:

Greptile Summary

This PR fixes a property name mismatch in CornerstoneViewportService._getFrameOfReferenceUID where displaySet.frameOfReferenceUID (camelCase, always undefined) was being used instead of displaySet.FrameOfReferenceUID (PascalCase), which is the correct name declared in the DisplaySet TypeScript interface and consistent with the DICOM standard used throughout the rest of the function.

Confidence Score: 5/5

Safe to merge — minimal, correct bug fix with no side effects.

Single two-line change corrects a property name that would always evaluate to undefined, aligning with the TypeScript interface declaration (FrameOfReferenceUID?: string in DisplaySet.ts) and the DICOM standard. No logic is altered; the fallback branches already existed. No P0/P1 concerns remain.

No files require special attention.

Vulnerabilities

No security concerns identified.

Important Files Changed

Filename	Overview
extensions/cornerstone/src/services/ViewportService/CornerstoneViewportService.ts	Corrects property access in _getFrameOfReferenceUID from displaySet.frameOfReferenceUID (camelCase, undefined) to displaySet.FrameOfReferenceUID (PascalCase), matching the DisplaySet TypeScript interface and DICOM standard naming.

_{Reviews (1): Last reviewed commit: "fix(cornerstone): read FrameOfReferenceU..." | Re-trigger Greptile}

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