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export function readOptionalString(value: unknown): string | null {
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  return typeof value === "string" && value.length > 0 ? value : null;
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}
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export function readPositiveNumber(value: unknown): number | null {
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  if (typeof value === "number" && Number.isFinite(value) && value > 0) {
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    return value;
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  }
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  if (typeof value !== "string" || value.trim() === "") {
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    return null;
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  }
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  const parsed = Number.parseFloat(value);
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  return Number.isFinite(parsed) && parsed > 0 ? parsed : null;
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}