Simplify BOM table rendering

[rushabhcodes]

This PR rewrites BomTable to render directly from the structured BOM rows returned by circuit-json-to-bom-csv instead of deriving the table from source_component elements.

What changed:
  - switched BOM table data flow to convertCircuitJsonToBomRows
  - removed the old supplier-column derivation from source_component
  - added lightweight metadata helpers for optional columns
  - kept JLCPCB part-number linking
  - preserved support for manufacturer/MPN pairs and extra BOM columns
  - aligned the table header and body through a shared descriptor source of truth

Verification:
  - bunx biome check lib/components/BomTable.tsx
  - bunx tsc -p tsconfig.json --noEmit

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Project	Deployment	Actions	Updated (UTC)
runframe	Ready	Preview, Comment	Apr 23, 2026 4:08pm

[Copilot]

Pull request overview

This PR refactors BomTable to render directly from structured BOM rows produced by convertCircuitJsonToBomRows, replacing the previous approach of deriving table columns/rows from source_component elements.

Changes:

• Switched BOM table rendering to use convertCircuitJsonToBomRows(circuitJson) output.
• Added metadata/descriptor helpers to drive header + body from a shared column descriptor list.
• Preserved JLCPCB part-number linking and support for manufacturer/MPN plus extra columns.

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[imrishabh18]

Split the code in separate files

[tscircuitbot]

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