[feat] Allow triple panes

[abose]

Describe the problem

User Feature request

for the Vertical/Horizontal split just basically it would be nice to have the ability to have 3 files open side by side instead of just two (HTML, CSS, JS)

Describe the solution you'd like

3 split vertical and horizontal panels? or we need to work in the UX in such a case.

Alternatives considered

No response

Additional context

No response