@tailwindcss/postcss 4.3.3: Ensure --spacing(0) optimizes to 0px in calc expressions and text-[--spacing(...)] infers font-size rather than color

# Notes

### search_known_solution Result
`search_known_solution` returned COMPATIBLE sample `sha256:52605f9f976b90b774ec86bcad38e5a02628014fd02d62a8b0b8937afdd907fc` ("Generate CSS with tailwind v4, which replaced tailwind.config.js with CSS-first config"), which demonstrates standard Tailwind v4 setup. This sample targets a specific behavioral patch fix in Tailwind CSS v4.3.3 (PR #20319) and v4.3.2 (PR #20260).

### What a model would have written instead
A model would naively expect `--spacing(0)` in arbitrary math expressions (`w-[calc(100%---spacing(0))]`) to optimize into a unitless `0` like normal arithmetic expressions (`width: calc(100% - 0);`).

### How the wrong version fails
On v4.3.2, Tailwind silently generated `width: calc(100% - 0);` with a green build, which fails at runtime in web browsers because CSS Values & Units specifications disallow unitless zero addition/subtraction against `<length-percentage>` in `calc()`.

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{
  "name": "csx-sample-tailwind-spacing-calc-fix",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "license": "MIT-0",
  "dependencies": {
    "@tailwindcss/postcss": "4.3.3",
    "postcss": "8.5.6",
    "tailwindcss": "4.3.3"
  }
}

import postcss from 'postcss';
import tailwind from '@tailwindcss/postcss';

// In Tailwind CSS v4, arbitrary spacing calculations with `--spacing(...)`
// are resolved during CSS generation. In patch 4.3.3 (PR #20319), Tailwind fixed
// an issue where `--spacing(0)` was over-optimized to unitless `0`, producing
// invalid CSS in length calculations such as `calc(100% - 0)`. In 4.3.3, it is
// preserved as `<length>` `0px`, resulting in valid `calc(100% - 0px)`.
// Additionally, v4.3.2+ (PR #20260) ensures `text-[--spacing(4)]` infers `font-size`
// rather than `color`.
export async function compileCss(css) {
  const result = await postcss([tailwind()]).process(css, {
    from: 'input.css',
    map: false,
  });
  return result.css;
}

import { strict as assert } from 'node:assert';
import { compileCss } from '../src/index.mjs';

const inputCss = `
@import "tailwindcss" source(none);
@source inline("w-[calc(100%---spacing(0))] text-[--spacing(4)] auto-rows-12");
`;

const css = await compileCss(inputCss);

// 1. Assert --spacing(0) optimizes to '0px' in calc(...) to preserve <length> type (v4.3.3 fix, PR #20319)
// In v4.3.2, this produced `width: calc(100% - 0);` which is invalid CSS length syntax.
// In v4.3.3, this produces `width: calc(100% - 0px);`.
assert.match(
  css,
  /width:\s*calc\(100%\s*-\s*0px\)/,
  'w-[calc(100%---spacing(0))] must output calc(100% - 0px) with unit 0px to remain a valid CSS <length>'
);

assert.ok(
  !css.includes('width: calc(100% - 0);') && !css.includes('width:calc(100% - 0)'),
  'must not generate unitless 0 inside length calc expressions'
);

// 2. Assert text-[--spacing(4)] is inferred as a length (font-size) rather than a color (v4.3.2 fix, PR #20260)
// In v4.3.1, this generated `color: calc(var(--spacing) * 4);`.
// In v4.3.2+, this generates `font-size: calc(var(--spacing) * 4);`.
assert.match(
  css,
  /font-size:\s*calc\(var\(--spacing\)\s*\*\s*4\)/,
  'text-[--spacing(4)] must generate font-size declaration, not color'
);

assert.ok(
  !css.includes('color: calc(var(--spacing) * 4)'),
  'text-[--spacing(4)] must not produce color declaration'
);

// 3. Assert bare spacing values work for auto-rows-* (v4.3.2 fix, PR #20229)
assert.match(
  css,
  /grid-auto-rows:\s*calc\(var\(--spacing\)\s*\*\s*12\)/,
  'auto-rows-12 must generate grid-auto-rows utility'
);

console.log('CONTRACT PASS: tailwindcss 4.3.3 maintains valid <length> in --spacing(0) calc and font-size inference');