/** Convert any image file (HEIC, AVIF, WebP, PNG, etc.) to a JPEG data URL via Canvas. */
const imageToJpegDataUrl = (file) =>
  new Promise((resolve, reject) => {
    const img = new Image();
    img.onload = () => {
      const canvas = document.createElement("canvas");
      canvas.width = img.naturalWidth;
      canvas.height = img.naturalHeight;
      canvas.getContext("2d").drawImage(img, 0, 0);
      URL.revokeObjectURL(img.src);
      resolve(canvas.toDataURL("image/jpeg", 0.92));
    };
    img.onerror = () => {
      URL.revokeObjectURL(img.src);
      reject(new Error("Failed to load image"));
    };
    img.src = URL.createObjectURL(file);
  });