Wrong gradient with dpi other than 72
As the title says. `1.pdf` is produced with dpi 72, and `2.pdf` with 96, `3.pdf` with 48. The gradient is shifted.
<img width="547" height="117" alt="Image" src="https://github.com/user-attachments/assets/83e737ba-c74e-4b6f-8de4-88af678fb31b" />
<details>
<summary>demo svg</summary>
```xml
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!-- Created with Inkscape (http://www.inkscape.org/) -->
<svg
width="100mm"
height="50mm"
viewBox="0 0 377.95323 188.97662"
version="1.1"
id="svg1"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns="http://www.w3.org/2000/svg"
xmlns:svg="http://www.w3.org/2000/svg">
<defs
id="defs1">
<linearGradient
id="linearGradient8">
<stop
style="stop-color:#00ff09;stop-opacity:1;"
offset="0"
id="stop7" />
<stop
style="stop-color:#000cff;stop-opacity:1;"
offset="1"
id="stop8" />
</linearGradient>
<linearGradient
id="linearGradient4">
<stop
style="stop-color:#00f7ff;stop-opacity:1;"
offset="0"
id="stop5" />
<stop
style="stop-color:#000cff;stop-opacity:1;"
offset="1"
id="stop6" />
</linearGradient>
<radialGradient
xlink:href="#linearGradient4"
id="radialGradient6"
cx="188.97662"
cy="94.488312"
fx="188.97662"
fy="94.488312"
r="122.51537"
gradientTransform="matrix(1,0,0,0.36743513,0,59.769984)"
gradientUnits="userSpaceOnUse" />
<linearGradient
xlink:href="#linearGradient8"
id="linearGradient7"
x1="66.46125"
y1="162.01299"
x2="311.49197"
y2="162.01299"
gradientUnits="userSpaceOnUse" />
</defs>
<g
id="layer1">
<g
id="g8"
transform="translate(0,-22.508224)">
<rect
style="fill:url(#radialGradient6);fill-opacity:1;fill-rule:evenodd;stroke-width:0.264567;stroke-linecap:square;stroke-miterlimit:0;stroke-dasharray:0.264567, 0.264567;paint-order:stroke fill markers"
id="rect1"
width="245.03073"
height="90.032898"
x="66.46125"
y="49.471859" />
<rect
style="fill:url(#linearGradient7);fill-opacity:1;fill-rule:evenodd;stroke-width:0.187077;stroke-linecap:square;stroke-miterlimit:0;stroke-dasharray:0.187077, 0.187077;paint-order:stroke fill markers"
id="rect6"
width="245.03073"
height="45.016441"
x="66.46125"
y="139.50476" />
</g>
</g>
</svg>
```
</details>
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