Compact-bar not clickable in full screen

Issue description

Using the default compact-bar plugin, when the focused pane is in full screen, clicking other tabs in the compact-bar does not switch tab.

In fact the plugin does not receive any mouse event when the focused pane is in full screen. This comes from the get_pane_id_at function in zellij-server/src/tab/mod.rs. This function always returns the full screened pane when there is one.

Minimal reproduction

From this layout.kdl file:

layout {
    tab name="Tab #1" hide_floating_panes=true {
        pane
        pane size=1 borderless=true {
            plugin location="zellij:compact-bar"
        }
    }
    tab name="Tab #2" focus=true hide_floating_panes=true {
        pane
        pane
        pane size=1 borderless=true {
            plugin location="zellij:compact-bar"
        }
    }
}

Then toggle full screen mode for a pane in the second tab, and click on Tab #1 on the compact-bar, and nothing happens.

Other relevant information

I managed to fix the issue by checking for non selectable panes if full screen is active. I will fill in a PR with my suggestion.