test : add unit tests for getAccountToken function

[tmdeveloper007]

Summary of What Needs to be Done:
Add unit tests for the getAccountToken function in src/lib/github-accounts.ts. Tests must use vitest framework and import actual source code.

Changes that Need to be Made:

• Create test using vitest describe/it/expect
• Import getAccountToken from src/lib/github-accounts.ts
• Test returns token when account exists
• Test returns null when account not found
• Test returns null when decryption fails

Impact that it would Provide:

• Ensures account token retrieval works correctly
• Validates error handling for missing accounts

[Harsh-Codes-77]

/assign

[github-actions]

✅ Closed as completed!

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