/attempt https://github.com/tscircuit/tscircuit/issues/1130

Summary

• Added useHighlightConnectedTracesOnHover hook that highlights all connected traces in the same net when hovering over any trace
• When hovering a trace, all traces sharing the same source_trace_id are highlighted together

Implementation

• New hook listens for mouseover/mouseout events on trace elements
• Finds connected traces via source_trace_id in CircuitJson
• Applies highlight color (#ff6b6b) and increased stroke width (7px)
• Handles edge cases: moving between connected traces, SVG changes

Test plan

• Hover over a trace - all connected traces should highlight
• Move mouse between connected traces - highlight should persist
• Move mouse away - all traces should return to original color

Fixes tscircuit/tscircuit#1130

/claim https://github.com/tscircuit/tscircuit/issues/1130