Tray dark theme (#591)

utils/win32_theme.py

@@ -0,0 +1,35 @@
+from __future__ import annotations
+
+import sys
+
+def is_windows_dark_theme() -> bool:
+    if sys.platform != "win32":
+        return False
+
+    try:
+        import winreg
+        key = winreg.OpenKey(winreg.HKEY_CURRENT_USER, r"Software\Microsoft\Windows\CurrentVersion\Themes\Personalize")
+        value, _ = winreg.QueryValueEx(key, "AppsUseLightTheme")
+        return value == 0
+    except Exception:
+        return False
+
+def apply_windows_dark_theme() -> None:
+    try:
+        import ctypes
+        uxtheme = ctypes.windll.uxtheme
+        
+        try:
+            set_preferred = uxtheme[135]
+            result = set_preferred(2)
+            if result == 0:
+                flush = uxtheme[136]
+                flush()
+        except Exception:
+            try:
+                allow_dark = uxtheme[135]
+                allow_dark(True)
+            except Exception:
+                pass
+    except Exception:
+        pass