Improve add task modal UI

[riya-k003]

📌 Description

Revamped the Add Task modal UI to create a cleaner, more modern, and visually polished user experience while maintaining the existing application theme and functionality.

🔗 Related Issue

Closes #4

🛠 Changes Made

• Improved modal layout, spacing, and visual hierarchy
• Added modern input styling, focus states, and responsive structure
• Added icons and required field indicators for better UX clarity
• Enhanced button styling and footer layout consistency
• Improved responsiveness across different screen sizes
• Maintained complete existing form functionality

📸 Screenshots (if applicable)

Before

After

✅ Checklist

• Code runs locally
• Followed project structure
• No console errors
• Properly tested changes
• Linked the issue

🚀 Notes for Reviewers

Focused on improving the overall visual experience and usability of the Add Task modal without changing the existing functionality or application theme.

[aryandas2911]

pls do these changes otherwise the UI update is really good, can you also do one thing... make sure when the form opens the entire background goes dim not just the task area