feat(typography): Standardize font sizes across application

[davedumto]

📝 Detailed Information

Font size standardization across the application to create a consistent and visually cohesive user interface. This update addresses typography inconsistencies that were impacting design quality and user experience.

🔗 Related Issues

Closes #271

🚀 Type of Change

• 🔧 Enhancement

✅ Checklist

• Code follows project style guidelines
• All new and existing tests pass
• Ready for review and merge

🚨 Problem

• Inconsistent font sizes across different pages
• Lack of uniformity in typography
• Potential user confusion due to visual inconsistencies

💡 Solution

• Comprehensive typography audit
• Normalized font sizes on landing, sign-in, and sign-up pages
• Implemented unified typography approach

🌟 Impact

• Improved visual consistency
• Enhanced UI readability
• Strengthened design language coherence

🧪 Testing Notes

• Verified font sizes across all major application pages
• Ensured readability and visual harmony
• Confirmed no adverse layout effects