refactor: utilize appstream lib

[jardon]

📝 Description

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Link to the related issue if applicable (e.g., Fixes #123).

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This PR updates the login form validation logic to handle empty username fields.
Fixes #45.

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🔍 Type of Change

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• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to change)
• 🧹 Code cleanup or refactor
• 🧪 Tests
• 📝 Documentation update
• ⚙️ CI/CD or build system update

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✅ How Has This Been Tested?

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• Unit tests added/updated
• Manual testing on Chrome, Firefox, and Safari

Test Configuration:

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• Browser:
• Node version (if applicable):

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📋 Checklist

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• Code follows the project’s style guidelines
• I have self-reviewed my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to documentation (if needed)
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

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🧠 Additional Context

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