fix: replace defines with constexpr/const and use more absolute paths for includes (#5527)

bye bye nuuls

src/singletons/Toasts.cpp

@@ -1,4 +1,4 @@
-#include "Toasts.hpp"
+#include "singletons/Toasts.hpp"
 
 #include "Application.hpp"
 #include "common/Common.hpp"
@@ -83,19 +83,17 @@ bool Toasts::isEnabled()
 
 QString Toasts::findStringFromReaction(const ToastReaction &reaction)
 {
-    // The constants are macros right now, but we want to avoid ASCII casts,
-    // so we're concatenating them with a QString literal - effectively making them part of it.
     switch (reaction)
     {
         case ToastReaction::OpenInBrowser:
-            return OPEN_IN_BROWSER u""_s;
+            return OPEN_IN_BROWSER;
         case ToastReaction::OpenInPlayer:
-            return OPEN_PLAYER_IN_BROWSER u""_s;
+            return OPEN_PLAYER_IN_BROWSER;
         case ToastReaction::OpenInStreamlink:
-            return OPEN_IN_STREAMLINK u""_s;
+            return OPEN_IN_STREAMLINK;
         case ToastReaction::DontOpen:
         default:
-            return DONT_OPEN u""_s;
+            return DONT_OPEN;
     }
 }