NethLink: Add right-click context menu support in the dialer input field

[mgarra]

Description:

Currently, the dialer input field allows users to enter a number manually or paste it using CTRL+V, but there is no right-click context menu support. Adding a context menu would improve usability by allowing users to:

• Paste numbers using the right-click menu (helpful for users unfamiliar with keyboard shortcuts).
• Copy existing numbers from the field using the right-click menu.

This feature would enhance accessibility and improve the user experience.

Steps to reproduce:

1. Open the dialer interface.
2. Right-click on the input field.
3. No context menu appears.

Expected behavior:

A standard context menu should appear with at least "Copy" and "Paste" options.

[andrea-marchionni]

This feature #7341 makes the right click needless.