fix: resolve viewport and grid alignment under browser zoom scaling (#286)

Mykeyrequested to merge
Mykeyy/canvas-fork:fix/grid-overlay-and-panzoom into main

Description

Fixes template and viewport misalignments when web browser zoom/DPI scaling is not set to 100% (#286).

Changes

  • Aligned PanZoom transforms to physical device pixels to prevent subpixel positioning shift during zoom.
  • Updated grid overlay rendering to maintain neutral contrast regardless of placed pixel colors.
  • Corrected position rounding logic in CanvasCore and Router.

Closes #286

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