Update UI to Use `Kbd` Component

[kics223w1]

Description

Shadcn has introduced a new Kbd component for displaying keyboard input in a consistent, accessible, and visually polished way.
We should update the UI to use the Kbd component for all keyboard input representations.

Acceptance Criteria

• Ensure the updated UI follows Shadcn’s recommended styling.
• Verify that keyboard hints render correctly on Windows, and Linux.
• Check for layout or spacing issues after the update.