fix : replaced emoji with Link2 icon in TaskItem dependsOn display

[tmdeveloper007]

Summary of What Has Been Done

Replaced the hardcoded link emoji (🔗) in the TaskItem.jsx component with a Lucide Link2 icon component in both the board view and list view dependency displays.

Changes Made

1. Added Link2 to the lucide-react imports in TaskItem.jsx.
2. In the board view, replaced 🔗 with <Link2 size={12} className="text-amber-500" />.
3. In the list view, replaced 🔗 with <Link2 size={12} className="text-amber-500" /> and wrapped the text in a flex container with flex items-center gap-1 for proper icon-text alignment.

Impact it Made

• Consistent use of vector icons instead of emoji across the task interface.
• Better visual scalability and accessibility.
• Matches the icon-based design language used in other task-related components.
• The amber color (text-amber-500) maintains the visual distinction of dependency links.

Note: please assign this PR to the tmdeveloper007 account.