When the config file changes and lazygit regains focus it reloads the
config, but the side panel window assignments, default views, tab
strips, and z-order were only ever set up on repo entry, so a changed
sidePanels wouldn't take effect until restart. Re-apply it from the
reload path: reassign windows and default views and restore each panel's
default tab.
The focused panel needs care: resetting it to its default tab would
leave the focused tab hidden behind that default tab, so the panel looks
unfocused even though its tab is selected. Re-focus the current context
so its tab stays shown and highlighted; only when the new config hides
the focused panel entirely do we move focus to the default side panel.
Tab strips are already refreshed via configureViewProperties.
