Fix same-net schematic trace hover highlighting

[RoyZhao1991]

/claim tscircuit/tscircuit#1130
/fixes tscircuit/tscircuit#1130

Problem

Hovering a schematic trace can fail to highlight other trace segments in the same net because generated schematic_trace elements may not carry subcircuit_connectivity_map_key, so the SVG output gets data-subcircuit-connectivity-map-key="undefined".

Solution

Populate schematic trace connectivity keys before SVG generation by deriving them from direct source_trace_id matches or solver-generated endpoint ids like solver_R1.2-C1.1. This lets the existing circuit-to-svg same-net hover CSS target all connected traces consistently.

Verification

• npx bun test
• npx bun run format:check
• npx bun run build

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Project	Deployment	Actions	Updated (UTC)
schematic-viewer	Ready	Preview, Comment	May 20, 2026 12:29pm