Runner TrayIcon: Monochrome icon should adapt to windows theme instead of the app theme (#44931)

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fix/what does it change/how was it tested (even manually, if necessary)?
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## Summary of the Pull Request
As title
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## PR Checklist

- [X] Closes: #44891
<!-- - [ ] Closes: #yyy (add separate lines for additional resolved
issues) -->
- [ ] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [ ] **Tests:** Added/updated and all pass
- [ ] **Localization:** All end-user-facing strings can be localized
- [ ] **Dev docs:** Added/updated
- [ ] **New binaries:** Added on the required places
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for new binaries
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installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs)
for new binaries and localization folder
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or any additional comments/features here -->
## Detailed Description of the Pull Request / Additional comments

<!-- Describe how you validated the behavior. Add automated tests
wherever possible, but list manual validation steps taken as well -->
## Validation Steps Performed
============ System light + App Light
<img width="903" height="239" alt="image"
src="https://github.com/user-attachments/assets/581606fb-99b5-4df9-a520-545a0c04676c"
/>
============ System Light + App Dark
<img width="991" height="239" alt="image"
src="https://github.com/user-attachments/assets/822009e9-57cf-452b-b3aa-f1cbc25883f8"
/>
============ System Dark + App Light
<img width="932" height="236" alt="image"
src="https://github.com/user-attachments/assets/98a56d48-31f0-4f75-95a4-8c7dc83c3866"
/>
============ System Dark + App Dark
<img width="903" height="236" alt="image"
src="https://github.com/user-attachments/assets/2500a0d5-6b27-403e-89b4-69b7d3b91e79"
/>
============

src/common/Themes/theme_listener.cpp

@@ -16,13 +16,50 @@ DWORD WINAPI _checkTheme(LPVOID lpParam)
 
 void ThemeListener::AddChangedHandler(THEME_HANDLE handle)
 {
+    std::lock_guard<std::mutex> lock(handlesMutex);
     handles.push_back(handle);
 }
 
 void ThemeListener::DelChangedHandler(THEME_HANDLE handle)
 {
+    std::lock_guard<std::mutex> lock(handlesMutex);
     auto it = std::find(handles.begin(), handles.end(), handle);
-    handles.erase(it);
+    if (it != handles.end())
+    {
+        handles.erase(it);
+    }
+}
+
+void ThemeListener::AddAppThemeChangedHandler(THEME_HANDLE handle)
+{
+    std::lock_guard<std::mutex> lock(handlesMutex);
+    appThemeHandles.push_back(handle);
+}
+
+void ThemeListener::DelAppThemeChangedHandler(THEME_HANDLE handle)
+{
+    std::lock_guard<std::mutex> lock(handlesMutex);
+    auto it = std::find(appThemeHandles.begin(), appThemeHandles.end(), handle);
+    if (it != appThemeHandles.end())
+    {
+        appThemeHandles.erase(it);
+    }
+}
+
+void ThemeListener::AddSystemThemeChangedHandler(THEME_HANDLE handle)
+{
+    std::lock_guard<std::mutex> lock(handlesMutex);
+    systemThemeHandles.push_back(handle);
+}
+
+void ThemeListener::DelSystemThemeChangedHandler(THEME_HANDLE handle)
+{
+    std::lock_guard<std::mutex> lock(handlesMutex);
+    auto it = std::find(systemThemeHandles.begin(), systemThemeHandles.end(), handle);
+    if (it != systemThemeHandles.end())
+    {
+        systemThemeHandles.erase(it);
+    }
 }
 
 void ThemeListener::CheckTheme()
@@ -48,13 +85,51 @@ void ThemeListener::CheckTheme()
 
             WaitForSingleObject(hEvent, INFINITE);
 
-            auto _theme = ThemeHelpers::GetAppTheme();
-            if (AppTheme != _theme)
+            auto _appTheme = ThemeHelpers::GetAppTheme();
+            auto _systemTheme = ThemeHelpers::GetSystemTheme();
+            
+            bool appThemeChanged = (AppTheme != _appTheme);
+            bool systemThemeChanged = (SystemTheme != _systemTheme);
+            
+            if (appThemeChanged || systemThemeChanged)
             {
-                AppTheme = _theme;
-                for (int i = 0; i < handles.size(); i++)
+                AppTheme = _appTheme;
+                SystemTheme = _systemTheme;
+                
+                // Copy handlers under lock, then invoke outside lock to avoid deadlock
+                std::vector<THEME_HANDLE> handlesCopy;
+                std::vector<THEME_HANDLE> appThemeHandlesCopy;
+                std::vector<THEME_HANDLE> systemThemeHandlesCopy;
+                
                 {
-                    handles[i]();
+                    std::lock_guard<std::mutex> lock(handlesMutex);
+                    handlesCopy = handles;
+                    if (appThemeChanged)
+                    {
+                        appThemeHandlesCopy = appThemeHandles;
+                    }
+                    if (systemThemeChanged)
+                    {
+                        systemThemeHandlesCopy = systemThemeHandles;
+                    }
+                }
+                
+                // Call generic handlers (backward compatible)
+                for (const auto& handler : handlesCopy)
+                {
+                    handler();
+                }
+                
+                // Call app theme specific handlers
+                for (const auto& handler : appThemeHandlesCopy)
+                {
+                    handler();
+                }
+                
+                // Call system theme specific handlers
+                for (const auto& handler : systemThemeHandlesCopy)
+                {
+                    handler();
                 }
             }
         }

src/common/Themes/theme_listener.h

@@ -3,6 +3,7 @@
 #include <windows.h>
 #include <iostream>
 #include <vector>
+#include <mutex>
 
 typedef void (*THEME_HANDLE)();
 DWORD WINAPI _checkTheme(LPVOID lpParam);
@@ -14,6 +15,7 @@ public:
     ThemeListener()
     {
         AppTheme = ThemeHelpers::GetAppTheme();
+        SystemTheme = ThemeHelpers::GetSystemTheme();
         dwThreadHandle = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)_checkTheme, this, 0, &dwThreadId);
     }
     ~ThemeListener()
@@ -23,12 +25,20 @@ public:
     }
 
     Theme AppTheme;
+    Theme SystemTheme;
     void ThemeListener::AddChangedHandler(THEME_HANDLE handle);
     void ThemeListener::DelChangedHandler(THEME_HANDLE handle);
+    void ThemeListener::AddAppThemeChangedHandler(THEME_HANDLE handle);
+    void ThemeListener::DelAppThemeChangedHandler(THEME_HANDLE handle);
+    void ThemeListener::AddSystemThemeChangedHandler(THEME_HANDLE handle);
+    void ThemeListener::DelSystemThemeChangedHandler(THEME_HANDLE handle);
     void CheckTheme();
 
 private:
     HANDLE dwThreadHandle;
     DWORD dwThreadId;
     std::vector<THEME_HANDLE> handles;
+    std::vector<THEME_HANDLE> appThemeHandles;
+    std::vector<THEME_HANDLE> systemThemeHandles;
+    mutable std::mutex handlesMutex;
 };