Highlight connected schematic traces on hover

[vneuralhiive]

Fixes tscircuit/tscircuit#1130
Closes #149

Summary

• Adds hover highlighting for schematic traces connected to the hovered trace.
• Groups connected traces using both connected_source_port_ids and connected_source_net_ids.
• Walks connectivity transitively so multi-segment nets and traces connected through shared ports highlight together.
• Disables trace-hover highlighting while edit mode is active to avoid conflicting with drag/edit trace styling.

Verification

• npm exec -- biome lint lib/components/SchematicViewer.tsx lib/hooks/use-highlight-connected-traces-on-hover.ts lib/utils/get-connected-schematic-trace-ids.ts
• npm exec --package typescript@5.8.3 -- tsc --noEmit
• Functional connected-trace grouping check returned {"sch1":["sch1","sch2"],"sch3":["sch3","sch4"]}

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Project	Deployment	Actions	Updated (UTC)
schematic-viewer	Ready	Preview, Comment	May 11, 2026 6:27am