Fix the foreground style for find my mouse (#42865)

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## Summary of the Pull Request

Find my mouse should use full transparent window

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## PR Checklist

- [X] Closes: #42758
- [ ] **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
- [ ] [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
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pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
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- [ ] **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

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## Detailed Description of the Pull Request / Additional comments

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## Validation Steps Performed


https://github.com/user-attachments/assets/75c73eb3-04bb-438c-8823-3c9f18923cc6

src/modules/MouseUtils/FindMyMouse/FindMyMouse.cpp

@@ -189,7 +189,7 @@ bool SuperSonar<D>::Initialize(HINSTANCE hinst)
         return false;
     }
 
-    DWORD exStyle = WS_EX_TOOLWINDOW | Shim()->GetExtendedStyle();
+    DWORD exStyle = WS_EX_TRANSPARENT | WS_EX_LAYERED | WS_EX_TOOLWINDOW | Shim()->GetExtendedStyle();
     HWND created = CreateWindowExW(exStyle, className, windowTitle, WS_POPUP, CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, m_hwndOwner, nullptr, hinst, this);
     if (!created)
     {
@@ -269,10 +269,6 @@ LRESULT SuperSonar<D>::BaseWndProc(UINT message, WPARAM wParam, LPARAM lParam) n
 
     case WM_NCHITTEST:
         return HTTRANSPARENT;
-
-    case WM_SETCURSOR:
-        SetCursor(LoadCursor(nullptr, IDC_ARROW));
-        return TRUE;
     }
 
     if (message == WM_PRIV_SHORTCUT)
@@ -539,7 +535,7 @@ void SuperSonar<D>::StartSonar()
     Trace::MousePointerFocused();
     // Cover the entire virtual screen.
     // HACK: Draw with 1 pixel off. Otherwise, Windows glitches the task bar transparency when a transparent window fill the whole screen.
-    SetWindowPos(m_hwnd, HWND_TOPMOST, GetSystemMetrics(SM_XVIRTUALSCREEN) + 1, GetSystemMetrics(SM_YVIRTUALSCREEN) + 1, GetSystemMetrics(SM_CXVIRTUALSCREEN) - 2, GetSystemMetrics(SM_CYVIRTUALSCREEN) - 2, SWP_NOACTIVATE);
+    SetWindowPos(m_hwnd, HWND_TOPMOST, GetSystemMetrics(SM_XVIRTUALSCREEN) + 1, GetSystemMetrics(SM_YVIRTUALSCREEN) + 1, GetSystemMetrics(SM_CXVIRTUALSCREEN) - 2, GetSystemMetrics(SM_CYVIRTUALSCREEN) - 2, 0);
     m_sonarPos = ptNowhere;
     OnMouseTimer();
     UpdateMouseSnooping();