Find My Mouse: Cursor should not go busy & window should not be active (#42795)

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## Summary of the Pull Request
Fix two issue in find my mouse:
 #42758  #42765 
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## PR Checklist

- [x] Closes: #42758 and #42765
- [ ] **Communication:** I've discussed this with core contributors
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- [ ] **Tests:** Added/updated and all pass
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## Detailed Description of the Pull Request / Additional comments

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wherever possible, but list manual validation steps taken as well -->
## Validation Steps Performed
| Problem | Before | After this fix |
|----------|---------|----------------|
| Mouse Loading status | html<br><video
src="https://github.com/user-attachments/assets/a07b3fe7-a9e1-4176-a33f-4836bf7f7e0a"
controls width="300"></video> | html<br><video
src="https://github.com/user-attachments/assets/a78848b0-6f34-4d68-b470-a4a3adbd8a5e"
controls width="300"></video> |
| Current window lose focus | html<br><video
src="https://github.com/user-attachments/assets/5122262c-6c98-4fe5-a107-5db2d96a6341"
controls width="300"></video> | html<br><video
src="https://github.com/user-attachments/assets/b12391c8-d148-4498-b37f-c8c1bc9e381a"
controls width="300"></video> |


The window lose focus test: Currently after activate the find my mouse,
the window lose focus, after the fix, foreground window is still the
focused window, And my keystroke will directly apply in the foreground
window.
Maybe hard to see in the video.

src/modules/MouseUtils/FindMyMouse/FindMyMouse.cpp

@@ -269,6 +269,10 @@ 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)
@@ -535,7 +539,7 @@ 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, 0);
+    SetWindowPos(m_hwnd, HWND_TOPMOST, GetSystemMetrics(SM_XVIRTUALSCREEN) + 1, GetSystemMetrics(SM_YVIRTUALSCREEN) + 1, GetSystemMetrics(SM_CXVIRTUALSCREEN) - 2, GetSystemMetrics(SM_CYVIRTUALSCREEN) - 2, SWP_NOACTIVATE);
     m_sonarPos = ptNowhere;
     OnMouseTimer();
     UpdateMouseSnooping();