Add schematic symbol props

[MustafaMulla29]

Summary

• add SchematicSymbolProps and the schematicSymbolProps parser
• keep the element schematic-only with an explicit, minimal prop surface
• add required name and symbolName
• support optional displayName and connections
• reject an empty connections map when that prop is supplied
• make chipRef optional, matching schematicbox
• support schX, schY, schRotation, schSectionName, and schSheetName
• export the new props and regenerate documentation

The schema intentionally does not extend commonComponentProps, avoiding unrelated PCB, footprint, supplier, and CAD props.

This is a props-only API change; it does not require a circuit-json schema change.

Validation

• bun test (377 passed)
• bun run typecheck
• bun run build
• bun run format:check
• bun run check-circular-deps

[tscircuitbot]

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Thank you for your contribution! 🎉

PR Rating: ⭐⭐
Impact: Minor

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