Setting grid origin in drawing sheet editor doesn't work
# Description
In drawing sheet editor, changing the grid origin (right click on empty space -\> Grid -\> Grid origin) does nothing.
# Steps to reproduce
1. Open the drawing sheet editor.
2. Right click on empty space -\> Grid -\> Grid origin
3. Change X and Y values and click OK. The grid origin did not change.
4. Open the grid origin dialog again. It still has old values.
The origin is always in the top-left corner. Changing the origin of the display coordinates in the top menu changes the values displayed in the grid origin dialog, but it doesn't change the origin (intentionally).
# KiCad Version
```
Application: KiCad Drawing Sheet Editor x64 on x64
Version: 10.0.3, release build
Libraries:
wxWidgets 3.3.2
FreeType 2.13.3
HarfBuzz 12.3.0
FontConfig 2.17.1
libcurl/8.18.0 Schannel zlib/1.3.1
Platform: Windows 11 (build 26200), 64-bit edition, 64 bit, Little endian, wxMSW
OpenGL: Intel, Intel(R) Graphics, 4.6.0 - Build 32.0.101.8331
Build Info:
Date: May 14 2026 13:33:37
wxWidgets: 3.3.2 (wchar_t,STL containers)
Boost: 1.90.0
OCC: 7.9.2
Curl: 8.18.0
ngspice: 46
Compiler: Visual C++ 1944 without C++ ABI
KICAD_IPC_API=ON
KICAD_USE_PCH=OFF
Locale:
Lang: en_SI
Enc: UTF-8
Num: 1.234,5
Encoded кΩ丈: D0BACEA9E4B888 (sys), D0BACEA9E4B888 (utf8)
```
issue