fix: resolve duplicate login error popups and improve error robustness

[harrshita123]

📋 Description

Summary: This PR fixes a bug on the login page where users would see two separate error popups at the same time when entering wrong credentials. I’ve also improved the error messaging to make it more reliable.

Issue: #124

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Key Changes:

Updated the HTTP Interceptor to stop showing global error messages specifically for the login API. This prevents the "double popup" issue.
Refactored the Login Component's error handling to be more robust. It now correctly handles different types of server errors (like 500 Internal Errors) and avoids showing broken messages like "undefinedundefined".

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✅ Type of Change

• 🐞 Bug fix (non-breaking change which resolves an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 🔥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 🛠 Refactor (change that is neither a fix nor a new feature)
• ⚙️ Config change (configuration file or build script updates)
• 📚 Documentation (updates to docs or readme)
• 🧪 Tests (adding new or updating existing tests)
• 🎨 UI/UX (changes that affect the user interface)
• 🚀 Performance (improves performance)
• 🧹 Chore (miscellaneous changes that don't modify src or test files)

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ℹ️ Additional Information
How it was tested:

Invalid Login: Entered wrong credentials and verified that only one clean "Unauthorized" popup appears. Server Downtime: Stopped the local API and verified that the UI shows a readable error message instead of crashing or showing "undefined".

Verification: Tested on both develop and main branches to ensure compatibility.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[drtechie]

Seems to be duplicate code as #79
Check the comment there.