Fix theme issues on macOS

* Fix #5025 - Change edit entry widget title separator to the common bullet character • (U+2022)
* Fix #5307 and Fix #5347 - Remove transparent toolbar/window on macOS and properly color text in toolbar.

src/gui/osutils/macutils/AppKit.h

@@ -37,6 +37,7 @@ public:
     bool hideProcess(pid_t pid);
     bool isHidden(pid_t pid);
     bool isDarkMode();
+    bool hasDarkMode();
     bool enableAccessibility();
     bool enableScreenRecording();
     void toggleForegroundApp(bool foreground);