fix(desktop-gpui): keep off-frame screenshot annotations in exports

[yashranaway]

if you drag an annotation past the edge of a screenshot, export grows the image to fit it, but the annotation itself got cut off at the old frame edge, so you'd get blank padding where your arrow or label should be. the code drew annotations onto the frame sized canvas before expanding it, which copied the old app's clipping on purpose during the port.

since this is the app that ships now, it draws the annotations after expanding, shifted along with the screenshot, so save, copy and share all keep them. blur masks still sample the original frame. the test checks every edge, 2x scaling and transparent backgrounds.

Confidence Score: 5/5

The PR appears safe to merge; no blocking issues remain.

Summary

Exports now draw annotations after expanding the canvas, keeping content beyond the screenshot edges.

• Screenshot exports keep annotations visible beyond the frame.

The earlier outline-clipping finding is addressed by the current bounds calculation and regression tests. No new actionable issues were found. Tests were inspected, not run.

_{Reviews (2) · Last reviewed commit: "fix(desktop-gpui): include stroke extent..." · Reviewed by Greptile}

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[yashranaway]

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[yashranaway]

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