fix: missing Trash2 import causing runtime crash on bulk delete in Tasks.jsx

[Codewithpabitra]

📌 Description

Fixed a runtime crash on the Tasks page caused by a missing Trash2 icon import. The bulk delete button uses <Trash2 /> from lucide-react but it was never imported, so selecting tasks and clicking the delete button would throw a ReferenceError and break the page entirely.

🔗 Related Issue

Closes #772

🛠 Changes Made

• Added Trash2 to the existing lucide-react import in frontend/src/pages/Tasks.jsx
• No logic, UI, or behavior changes - purely a missing import fix

✅ Checklist

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

🚀 Notes for Reviewers

One-line change - just adding Trash2 to the lucide-react import.

[Codewithpabitra]

This was a very minimal change made issue that's why simply created the PR.