feat: highlight connected schematic traces on hover

[zhangdaren7-byte]

Summary

• add a hook that groups schematic traces by shared source trace, source net, source port, or subcircuit connectivity
• highlight every connected schematic trace group on hover while preserving trace crossing outline behavior

Testing

• npm exec -- biome check lib/hooks/useHighlightConnectedSchematicTraces.ts lib/components/SchematicViewer.tsx
• npm exec -- tsc --noEmit
• npm exec -- tsup-node ./lib/index.ts --dts --format esm --sourcemap

Fixes tscircuit/tscircuit#1130

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Project	Deployment	Actions	Updated (UTC)
schematic-viewer	Ready	Preview, Comment	May 11, 2026 3:16pm