Render preview: draw within the pixel budget on 4K/5K screens (#1464) (#1477)

The product preview asked the viewport executor for the full physical
viewport, so a maximised 4K window (~8 MP) was refused against the 4 MP
limit on every frame. The preview now draws at the largest size of the
same aspect the executor admits (RenderLimits::fit, scratch included)
and filters it up into the viewport through the existing offscreen
blit. Viewports within the limits still draw at full size.

PNG setups past the image limits now say what the limits are and the
largest size at that aspect, and the image panel offers to use it.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
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bherbruckandClaude Opus 5.5 authored and GitHub committed 2026-10-15 15:18:00 -04:00
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@@ -1091,6 +1091,8 @@
"render.image_failed": "Ошибка рендеринга",
"render.image_unknown": "Состояние рендеринга недоступно",
"render.image_reduce": "Попробуйте уменьшить изображение или упростить сцену.",
"render.image_too_large": "Превышен предел изображения: 4096 пикселей по стороне и 4 194 304 пикселя всего.",
"render.image_use_largest": "Использовать наибольший размер с этим соотношением сторон:",
"render.image_cancel": "Отменить рендеринг",
"render.image_stale": "Используется сцена, сохранённая до последующих изменений.",
"render.image_start": "Начать рендеринг",