The overlap detection was comparing center-to-center Euclidean distance with
a 0.5mm tolerance, missing components whose bodies physically overlap but have
different centers (e.g. a resistor placed inside an opamp triangle). Now uses
AABB intersection on pin-derived bounding boxes, matching the approach already
used by check_wire_collisions. Extracted shared bbox logic into
_compute_symbol_bbox_direct and _aabb_overlap helpers.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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