compositor: Configurable behavior when window to be focused conflicts with fullscreen (#12033)

Renames `misc:new_window_takes_over_fullscreen` into
`misc:on_focus_under_fullscreen` and implements the following behavior:

- By default, when a tiling window is being focused on a workspace where
  a fullscreen/maximized window exists, respect
  the `misc:on_focus_under_fullscreen` config variable.

src/hyprerror/HyprError.cpp

@@ -7,6 +7,7 @@
 #include "../managers/animation/AnimationManager.hpp"
 #include "../render/Renderer.hpp"
 #include "../managers/HookSystemManager.hpp"
+#include "../desktop/state/FocusState.hpp"
 
 #include <hyprutils/utils/ScopeGuard.hpp>
 using namespace Hyprutils::Animation;
@@ -18,7 +19,7 @@ CHyprError::CHyprError() {
         if (!m_isCreated)
             return;
 
-        g_pHyprRenderer->damageMonitor(g_pCompositor->m_lastMonitor.lock());
+        g_pHyprRenderer->damageMonitor(Desktop::focusState()->monitor());
         m_monitorChanged = true;
     });