Fix Sign In crash and Consultation navigation issues (#316)

[suryaprakash0010]

📄 Description

Fixed critical issues in the InfantCareCompass application that were preventing proper functionality:

🔧 Sign In Page Error Fix

Problem: handleGitHubLogin is not defined error crashed the Sign In page when users clicked the GitHub login button
Solution: Implemented the missing SignIn.jsx
function with proper error handling and user-friendly toast notifications
Result: Sign In page now works without crashes and provides clear feedback to users

🛣️ Consultation Navigation Fix

Problem: After visiting the Consultation page, navigation links (Home, About, Blog) stopped working due to routing conflicts
Solution:
Fixed consultation route structure in routes.jsx
with proper nested routing
Corrected duplicate route definitions that caused conflicts
Ensured proper configuration for nested routes
Result: All navigation works seamlessly after visiting Consultation page

🎨 News Page Background Consistency Fix

Problem: News page had inconsistent light background that broke brand identity compared to other pages
Solution:
Updated News page background to match Home page dark theme
Applied glassmorphism card styling for dark theme compatibility
Fixed all text colors for proper contrast on dark background
Result: News page now has consistent dark theme matching entire website

✅ Checklist

My code follows the project's coding guidelines.
I have tested these changes locally.
I have added necessary documentation/comments (if applicable).
I have linked the related issue (if applicable).

🔗 Related Issue

Closes #316 and #315

📸 Screenshots & video (if applicable)
No UI screenshots required as these are code fixes (routing, error handling, and styling)

🎯 Issues Resolved

✅ Sign In authentication flow now works without errors (#316)
✅ Navigation links function properly after visiting Consultation page (#316)
✅ Nested routing for doctor detail pages works correctly (#316)
✅ News page background now consistent with site theme (#315)

🔧 Technical Details

Files Modified:
client/src/pages/SignIn.jsx
(added handleGitHubLogin function)
client/src/routes/routes.jsx
(fixed routing structure)
client/src/pages/consult.jsx
(fixed nested routing)
client/src/pages/News.jsx
(updated background theme and styling)
Testing: All fixes have been validated and work as expected
Backward Compatibility: Changes are fully backward compatible

🚀 Impact

These fixes resolve critical user experience issues that were preventing users from:
Successfully signing into the application
Navigating between pages after using the Consultation feature
Experiencing consistent visual branding across all pages
The application now provides a smooth, error-free, and visually consistent experience for all users! 🎉

📊 Summary

Issues Fixed: #316 (Sign In & Navigation) and #315 (News Background)
Files Changed: 3 files with targeted improvements
User Experience: Significantly improved with no crashes or navigation issues

[suryaprakash0010]

Merge conflicts resolved! I've updated the branch with the required fixes. Please check and merge.