removed the duplicate checkbox

[pratyuxxhh]

📌 Description

Fixed the duplicate checkbox issue in the Tasks section by removing the unnecessary native checkbox and related bulk-selection functionality. Each task row now displays only a single styled completion button, resulting in a cleaner and more consistent UI.

Also the default checkbox was crashing the whole website .

🔗 Related Issue

Closes #464

🛠 Changes Made

• Removed the duplicate native <input type="checkbox"> from TaskItem.jsx
• Removed bulk-select state management from Tasks.jsx
• Removed the “Delete Selected” button and related logic
• Kept task completion functionality using the styled square check button
• Preserved edit and delete actions on the right side of each task row

📸 Screenshots

✅ Checklist

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

🚀 Notes for Reviewers

This PR only removes the redundant checkbox and unused bulk-selection functionality. Existing task completion behavior remains unchanged.

[pratyuxxhh]

Hi @aryandas2911 ,

Just following up on this PR.
The issue has been fixed and tested from my side. Since the PR has been inactive for a while, could you please take a look whenever you get time?

Thank you!

[pratyuxxhh]

@aryandas2911 please check this PR