yogeshwaran-c 451b858997 fix: use conic-gradient for image preview transparency checkerboard ...

The transparency checkerboard pattern in the image preview used two
overlapping linear-gradient(45deg, ...) backgrounds with offset
positions. At certain zoom levels, subpixel rendering caused visible
triangular artifacts at the gradient boundaries.

Replace with a single conic-gradient per theme, which creates a clean
four-square checkerboard tile without diagonal edges, eliminating
the rendering artifacts at all zoom levels.

Closes #229565

2026-03-26 06:11:00 +05:30

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