fix(view): properly calculate offscreen state

[0xsven]

Why

The View component is designed to work within a Canvas that is not necessarily fullscreen. According to the documentation:

Quote from the docs:

Note that @react-three/fiber newer than ^8.1.0 is required for View to work correctly if the canvas/react three fiber root is not fullscreen.

However, I observed that View wasn’t behaving as expected. Specifically, it was checking whether the View is offscreen, rather than checking if it's outside the canvas boundaries. This caused issues when View was partially or entirely within the canvas but still considered offscreen.

Here is a codesandbox: https://codesandbox.io/p/sandbox/view-skissor-forked-w2tds3?file=%2Fsrc%2Fstyles.css%3A38%2C1
Notice how the View (red border) is not always running when inside the canvas (blue border).

What

• Retained the existing offscreen logic for legacy CanvasSize.
• Updated the offscreen calculation logic specifically for @react-three/fiber versions before 8.1.0.

Maybe isOffscreen should even be renamed to isOffcanvas ?

Checklist

• Documentation updated (example) --> not needed
• Storybook entry added (example) --> Haven't found a View story. I could create one, if that's needed...
• Ready to be merged

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