[CropAndLock] theme (#38044)

## Summary of the Pull Request

Theme aware cropped windows.

## PR Checklist
- [x] **Closes:** #28348
- [ ] **Communication:** I've discussed this with core contributors
already. If 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
- [ ] [JSON for
signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json)
for new binaries
- [ ] [WXS for
installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs)
for new binaries and localization folder
- [ ] [YML for CI
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
for new test projects
- [ ] [YML for signed
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml)
- [ ] **Documentation updated:** If checked, please file a pull request
on [our docs
repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys)
and link it here: #xxx

## Detailed Description of the Pull Request / Additional comments

Added a Theme aware implementation that was already found on other
components, the only difference is that we are dealing with multiple
windows.
It will follow the Power Toys application theme, (windows too in case
PowerToys follows the System).
I decided to change the scope of a variable to not create a second
control of croppedWindows, this may need to be taken into consideration.

## Validation Steps Performed

Using Crop (Win + Ctrl + Shift +R)
Crop one or multiple windows.
All of them have the same theme as the application.
Went to windows theme settings, change to light theme, the app changes
accordingly.

Same behavior was tested with Thumbnail (Win  + Ctrl + Shift + T)

Closing windows and changing the theme again.

src/modules/CropAndLock/CropAndLock/CropAndLock.vcxproj

@@ -154,6 +154,9 @@
     <ProjectReference Include="..\..\..\common\Telemetry\EtwTrace\EtwTrace.vcxproj">
       <Project>{8f021b46-362b-485c-bfba-ccf83e820cbd}</Project>
     </ProjectReference>
+    <ProjectReference Include="..\..\..\common\Themes\Themes.vcxproj">
+      <Project>{98537082-0fdb-40de-abd8-0dc5a4269bab}</Project>
+    </ProjectReference>
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <Import Project="..\..\..\..\deps\spdlog.props" />

src/modules/CropAndLock/CropAndLock/main.cpp

@@ -17,6 +17,9 @@
 
 #include <common/Telemetry/EtwTrace/EtwTrace.h>
 
+#include <common/Themes/theme_helpers.h>
+#include <common/Themes/theme_listener.h>
+
 #pragma comment(linker, "/manifestdependency:\"type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' processorArchitecture='*' publicKeyToken='6595b64144ccf1df' language='*'\"")
 
 namespace winrt
@@ -35,6 +38,23 @@ namespace util
 const std::wstring instanceMutexName = L"Local\\PowerToys_CropAndLock_InstanceMutex";
 bool m_running = true;
 
+// Theming
+ThemeListener theme_listener{};
+// Keep a list of our cropped windows
+std::vector<std::shared_ptr<CropAndLockWindow>> croppedWindows;
+
+void handleTheme()
+{
+    auto theme = theme_listener.AppTheme;
+    auto isDark = theme == Theme::Dark;
+    Logger::info(L"Theme is now {}", isDark ? L"Dark" : L"Light");
+    for (auto&& croppedWindow : croppedWindows)
+    {
+        ThemeHelpers::SetImmersiveDarkMode(croppedWindow->Handle(), isDark);
+    }
+}
+
+
 int WINAPI wWinMain(_In_ HINSTANCE, _In_opt_ HINSTANCE, _In_ PWSTR lpCmdLine, _In_ int)
 {
     // Initialize COM
@@ -42,6 +62,8 @@ int WINAPI wWinMain(_In_ HINSTANCE, _In_opt_ HINSTANCE, _In_ PWSTR lpCmdLine, _I
 
     Trace::CropAndLock::RegisterProvider();
 
+    theme_listener.AddChangedHandler(handleTheme);
+
     Shared::Trace::ETWTrace trace;
     trace.UpdateState(true);
 
@@ -107,8 +129,6 @@ int WINAPI wWinMain(_In_ HINSTANCE, _In_opt_ HINSTANCE, _In_ PWSTR lpCmdLine, _I
     // Create our overlay window
     std::unique_ptr<OverlayWindow> overlayWindow;
 
-    // Keep a list of our cropped windows
-    std::vector<std::shared_ptr<CropAndLockWindow>> croppedWindows;
 
     // Handles and thread for the events sent from runner
     HANDLE m_reparent_event_handle;
@@ -167,6 +187,7 @@ int WINAPI wWinMain(_In_ HINSTANCE, _In_opt_ HINSTANCE, _In_ PWSTR lpCmdLine, _I
             croppedWindow->CropAndLock(targetWindow, cropRect);
             croppedWindow->OnClosed(removeWindowCallback);
             croppedWindows.push_back(croppedWindow);
+            handleTheme();
         };
 
         overlayWindow.reset();