SchematicRect drops fillColor from circuit JSON and renders filled rectangles with the stroke color

Summary

<schematicrect isFilled fillColor="..." /> accepts fillColor in
@tscircuit/props, but @tscircuit/core drops the value when it inserts the
schematic_rect circuit-JSON element. Renderers then fall back to the stroke
color, so a requested white rectangle becomes a solid dark block.

This is particularly visible in components generated by tsci import from
EasyEDA. The importer correctly emits fillColor="#FFFFFF" for a symbol body,
but core removes it during rendering.

Environment

• tscircuit: 0.0.2253
• @tscircuit/core: 0.0.1617
• @tscircuit/cli: 0.1.1850

The omission is also present on the current tscircuit/core main branch.

Minimal reproduction

const pinLabels = {
  pin1: ["A"],
  pin2: ["B"],
} as const

export default function SchematicRectFillRepro() {
  return (
    <board width="12mm" height="8mm" routingDisabled>
      <chip
        name="U1"
        manufacturerPartNumber="SCHEMATIC_FILL_REPRO"
        pinLabels={pinLabels}
        footprint="dip2"
        symbol={
          <symbol>
            <schematicrect
              schX={0}
              schY={1.5}
              width={4}
              height={2}
              color="#880000"
              isFilled
              fillColor="#FFFFFF"
            />
            <schematiccircle
              center={{ x: 0, y: -1.5 }}
              radius={1}
              color="#008800"
              isFilled
              fillColor="#FFFFFF"
            />
            <port name="pin1" pinNumber={1} direction="left" schX={-3} schY={0} />
            <port name="pin2" pinNumber={2} direction="right" schX={3} schY={0} />
          </symbol>
        }
      />
    </board>
  )
}

Build and inspect the two generated primitives:

tsci build index.circuit.tsx --routing-disabled --schematic-png
jq '[.[] | select(.type == "schematic_rect" or .type == "schematic_circle") | {type, color, is_filled, fill_color}]' dist/index/circuit.json

Actual output:

[
  {
    "type": "schematic_rect",
    "color": "#880000",
    "is_filled": true,
    "fill_color": null
  },
  {
    "type": "schematic_circle",
    "color": "#008800",
    "is_filled": true,
    "fill_color": "#FFFFFF"
  }
]

The generated PNG shows a solid dark-red rectangle and a correctly white-filled
green circle.

Expected behavior

Both elements should preserve fill_color: "#FFFFFF" and render with white
fills.

Likely fix

SchematicRect.doInitialSchematicPrimitiveRender() inserts is_filled but not
fill_color:

const schematic_rect = db.schematic_rect.insert({
  // ...
  is_filled: props.isFilled,
  // Missing: fill_color: props.fillColor,
  // ...
})

The equivalent SchematicCircle and SchematicPath implementations already
insert fill_color: props.fillColor. Adding the same field to
SchematicRect, plus a regression test comparing the resulting circuit JSON,
should fix the issue.

Source:
https://github.com/tscircuit/core/blob/main/lib/components/primitive-components/SchematicRect.ts

Start with lib/components/primitive-components/SchematicRect.ts and compare its initial primitive insertion with SchematicCircle and SchematicPath. Add a regression test that compares the generated circuit JSON for a filled rectangle, then verify the rectangle preserves fill_color and renders with the requested fill.