Highlight connected schematic traces on hover

[cuongdodhct-a11y]

Fixes tscircuit/tscircuit#1130

/claim tscircuit/tscircuit#1130

Summary

• map schematic trace groups back to their source trace ids from Circuit JSON
• add hover listeners that apply the same highlight class to every schematic trace sharing a source trace
• preserve the existing trace hover visual treatment while extending it across connected traces

Verification

• npx bun run build
• npx biome check lib/components/SchematicViewer.tsx
• npx bun test (reports no test files in this repo)
• preview server: npx bun run start -- --host 127.0.0.1 --port 5005, confirmed Cosmos and Vite renderer return HTTP 200

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Project	Deployment	Actions	Updated (UTC)
schematic-viewer	Ready	Preview, Comment	May 26, 2026 6:55am