[feature]: redesign the ui with shadcn ui

[vijaypotnuru]

Is there an existing issue for this?

• I have searched the existing issues

Summary

Redesign the UI using Shadcn UI for easier maintenance, consistency, and feature implementation.

Why should this be worked on?

Because of the shadcn ui, we can easily implement frontend features, and also Shadcn UI have a large ecosystem

[sriramveeraghanta]

Plane utilizes its own design system for UI components. Previously, we relied on various dependencies as part of this system. Now, we're moving toward a more consistent approach inspired by Shadcn UI. We're currently in the process of migrating our components and will update you once this transition is complete.