fix(ui): preserve 0 as valid coordinate for focal point

[nataliausoltseva]

What?

Replaces logical OR (||) fallback checks with nullish coalescing (??) when resolving initialFocalPoint coordinates (x and y) in packages/ui/src/elements/Upload/index.tsx.

Why?

When an image focal point coordinate ($x$ or $y$) is set to 0 (e.g. aligning to the far left or top edge of an image), the previous || operator treats 0 as a falsy value. This causes the focal coordinate to unintentionally default back to 50.

How?

Using nullish coalescing (??) ensures that explicit 0 values are respected while still falling back to data?.focal* or 50 when the values are strictly null or undefined.

Before:

initialFocalPoint={{
  x: uploadEdits?.focalPoint?.x || data?.focalX || 50,
  y: uploadEdits?.focalPoint?.y || data?.focalY || 50,
}}