[diiviocity]

Summary

• Derive full-window layout bounds from the framebuffer dimensions divided by the active gg scale, preserving fractional logical dimensions.
• Use those exact bounds for screen layout, full-window clips, menus, popovers, and the GL-surface callback.
• Route UI clips through gg's new scissor_rectf API so framebuffer scissor edges round outward once instead of truncating logical origin and extent separately.

Validation

• v -check examples/calculator_resizable
• Desktop calculator at 1.5x, 958x1078 and 958x1077: no clear-color pixels on the right or bottom edges.

Depends on vlang/v#31485 (gg scissor_rectf API).