[Issue]: Entra ID sign-in in the desktop app #9

Branch Name

feature/09-entra-id

Task

Description
Let users sign in to the desktop app with their organizational Microsoft account and send the access token with every API request.

Scope

• Sign-in flow with MSAL
• Secure token storage and silent refresh
• Attach the token to API calls
• Sign-out

Acceptance Criteria

• A tenant user can sign in with their work account
• The session persists across app restarts until sign-out
• API calls include a valid token
• Sign-out clears the session

Checklist

• I have checked for duplicate issues.
• I have assigned the issue to the correct project board.
• I have tagged the issue properly.

Code of Conduct

• I agree to follow this project's Code of Conduct