feat: update authentication forms with core library improvements

[jfrench9]

Summary

This PR integrates the latest updates from the core authentication library, bringing improvements to both SignIn and SignUp form components. The changes involve refactoring existing code patterns while maintaining the same functionality.

Changes Made

• SignInForm.tsx: Updated component implementation with 12 line modifications
• SignUpForm.tsx: Enhanced component structure with 16 line changes
• Merged core library changes from commit range 1148c6f..48a6fdf

Key Improvements

• Improved code consistency across authentication components
• Enhanced maintainability through updated patterns from core library
• Standardized form handling and validation approaches

Breaking Changes

❌ No breaking changes expected - this is primarily a refactoring update that maintains existing API contracts.

Testing Notes

Please verify the following functionality:

• Sign in flow works correctly with valid credentials
• Sign up process completes successfully
• Form validation displays appropriate error messages
• Loading states appear correctly during authentication
• Error handling works as expected for invalid inputs

Browser Compatibility

• No new browser-specific features introduced
• Existing browser support maintained
• Recommended to test on primary supported browsers (Chrome, Firefox, Safari, Edge)

Additional Notes

This update pulls in core library improvements that enhance the overall authentication experience while maintaining backward compatibility.

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🤖 Generated with Claude Code

Branch Info:

• Source: chore/login-core-pull
• Target: main
• Type: feature

Co-Authored-By: Claude noreply@anthropic.com