KDE/Qt apps report [0,0,0,0] bounds for elements that are perfectly
clickable by index (live QA: all 50 of kcalc's zero-rect elements,
including every radio button). Serializing that as a plausible rect
invites a model to derive coordinate=[0,0] and click the screen corner.
- _element_to_dict: zero rect -> bounds: null
- _format_elements: '@ bounds-unknown (click by element index)' instead
of the fake rect in the summary line
- malformed bounds fail open (unchanged serialization)
Live-proven on real kcalc (cua-driver 0.20.0): 50 elements now null, 0
zero-rect leftovers, summary annotated, real rects preserved, and a
null-bounds radio button still clicks fine by index.
Teknium
9b9dd6eeab