fix(svg): paint transparent component fills first

[KrishnaX12]

Summary

• Prioritize transparent component fills (e.g. background boxes) behind opaque symbol graphics (e.g. diode polygons, windings).
• Preserve existing pin-label paint ordering so pin text remains on top.
• Update affected schematic snapshot tests.

Context

In Altium schematics, component body boxes (such as RECORD=14 rectangles with TRANSPARENT=T and filled background AREACOLOR) may appear after symbol primitives or pins in the record stream. Previously, these late filled graphics were painted over opaque symbol graphics (like diode triangle fills), obscuring the component symbols.
This change separates transparent background fills from opaque foreground graphics, ensuring background boxes are painted first behind symbol graphics while preserving foreground and pin-label paint order.

Visual Comparison: Altium 365 (Reference) vs altium.tscircuit.com

1. RJ45 Connector with Integrated Magnetics (J9)

Altium 365 (Reference)	altium.tscircuit.com

2. Component Box & Diode Symbol (D11 / D8)

Altium 365 (Reference)	altium.tscircuit.com

Testing

• bun test tests/svg/schematic-component-paint-order.test.ts
• bun test --max-concurrency=1
• bun run typecheck
• bun run format:check
• bun run build

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