Provided design feedback on the allLayers configuration option name in response to maintainer question.

Context

The allLayers option was added to OutputCssLayersOptions to force output of all CSS layer names in the @layer declaration, even if some layers contain no rules:

{
  outputToCssLayers: {
    allLayers: true  // Outputs: @layer theme, preflights, unused-layer, default;
  }
}

Response

Analyzed the naming in context of:

• Parent option name (outputToCssLayers)
• Existing boolean option naming patterns in codebase
• Core behavior (including unused/empty layers)

Recommended keeping allLayers for clarity and conciseness, with includeUnused as viable alternative if emphasizing the key differentiator.

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