fix: Fixed Citation URL load issue

[Prajwal-Microsoft]

Purpose

• This pull request enhances the way the frontend handles "Open document" links for citations, especially for files stored behind backend authentication (Easy Auth). It introduces a new API client for securely fetching these files, updates the UI to distinguish between external and backend-gated documents, and adds comprehensive tests for the new logic.

Backend-gated file handling improvements:

• Added a new REST client fetchDocumentObjectUrl in src/frontend/src/api/files.tsx to fetch document blobs from /api/files/<name> using authenticated requests and return object URLs for inline viewing.
• Updated the CitationDetailPanel component to open backend-gated files by fetching them with the bearer token and redirecting a placeholder tab to the resulting object URL, ensuring files behind Easy Auth are accessible in the UI. [1] [2]
• Created a new CitationDocument type and resolveCitationDocument function in documentHref.tsx to classify citation targets as either external URLs or backend-gated files, improving link handling logic. [1] [2]

Testing and coverage:

• Added a dedicated test suite for fetchDocumentObjectUrl covering authentication headers, object URL creation, and error handling.
• Extended tests for CitationDetailPanel to verify correct behavior when opening backend-gated files versus external links, including mocking and asserting fetch logic. [1] [2]
• Added tests for resolveCitationDocument to ensure correct classification of citation targets. [1] [2]

Build and config updates:

• Updated the TypeScript build info to include the new files.tsx API module.

Does this introduce a breaking change?

• Yes
• No

How to Test

• Get the code

git clone [repo-address]
cd [repo-name]
git checkout [branch-name]
npm install

• Test the code

What to Check

Verify that the following are valid

• ...

Other Information