Preserve courtyard RECT geometry in generated TSX

[rushabhcodes]

Fixes a data-preservation and geometry-type regression in EasyEDA footprint conversion: explicit courtyard-layer RECT elements were not preserved as courtyard rectangles in generated TSX.

Impact

Affected footprints could lose their rectangular courtyard keepout geometry or receive an extra synthetic courtyard outline when converted. The source payload contains an explicit courtyard RECT, but the conversion path previously relied on the BBox courtyard-outline fallback whenever no courtyard TRACK was present.

Root cause

• generateFootprintTsx handled courtyard outlines but omitted pcb_courtyard_rect elements.
• The BBox fallback treated the absence of a courtyard TRACK as proof that no explicit courtyard geometry existed, even when a courtyard RECT was present.

Fix

• Emit each pcb_courtyard_rect as <courtyardrect>.
• Preserve center position, width, height, and counter-clockwise rotation.
• Suppress the synthetic BBox <courtyardoutline> when an explicit courtyard RECT exists.
• Keep existing courtyard TRACK/outline behavior unchanged.

Regression coverage

The package RECT conversion test moves a RECT onto EasyEDA courtyard layer 13 and verifies:

• one pcb_courtyard_rect is produced;
• no synthetic pcb_courtyard_outline is added;
• generated TSX contains <courtyardrect> and no <courtyardoutline>.

The existing footprint-generator test remains focused on standalone oval-hole generation; courtyard rectangles are covered at the conversion boundary where the geometry type is selected.

Validation

• bun test tests/convert-package-rect.test.ts tests/generate-footprint-tsx.test.ts
• bun run build

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