fix: integration token refresh test reads cookie instead of JSON body

[DivyashreeR008]

Closes #55

Problem

The integration test assumed the refresh token was returned in the login JSON response body. But the auth service sets it as an httpOnly cookie (auth-service/index.js:713-718) and the /refresh endpoint reads from req.cookies (auth-service/index.js:744).

Lines 106 and 129-131 of run-integration-tests.sh:

• Line 106 tried to extract refreshToken from the JSON body, which returned empty
• Lines 129-131 sent the (empty) token as a JSON POST body
• The || REFRESH_TOKEN="" on line 106 silently swallowed the failure
• The test always fell through to "Token refresh - no refresh token"

Fix

• Added curl -c cookie jar to the login request to capture the Set-Cookie header
• Removed the broken JSON body extraction of refreshToken (it was never in the JSON)
• Changed the refresh request to use curl -b to send the stored cookie
• Also passes -c to refresh to capture the rotated refreshToken cookie
• Cleans up the temp cookie jar file after the test

Testing

The token refresh test now:

1. Logs in and stores the refreshToken cookie via curl -c
2. Checks the cookie jar actually contains refreshToken before proceeding
3. Sends the cookie back on the /refresh call via curl -b
4. Extracts the new token from the response JSON and continues with it

[Senthil455]

gh: Not Found (HTTP 404)
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