Trim a detection's polygon when its bounding box is shrunk over it

[mattdawkins]

Problem

Resizing a detection's bounding box leaves its polygon untouched, so shrinking the box past the polygon leaves polygon geometry sticking out beyond the box.

Fix

Box edits now clip any polygon on the detection to the new bounds using a small Sutherland–Hodgman implementation (clipPolygonToBounds in src/utils.ts, no new dependency):

• Polygons crossing the new box edge are trimmed to fit.
• A polygon falling entirely outside the new box is removed.
• Holes are clipped by the same rule; holes left with fewer than 3 points are dropped.
• Clipping happens against the rounded bounds that setFeature stores, so the trimmed polygon is consistent with the persisted box.
• Rotated boxes are exempt: their stored bounds are the unrotated envelope, so an axis-aligned clip would cut the wrong region.

Unit tests cover containment, single/multi-edge clipping, slanted-edge intersection points, full removal, and hole handling.

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