Document local setup and OCR workflow

src/parser.js

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+export function rectFromPoints(start, end) {
+  return {
+    x: Math.round(Math.min(start.x, end.x)),
+    y: Math.round(Math.min(start.y, end.y)),
+    width: Math.round(Math.abs(end.x - start.x)),
+    height: Math.round(Math.abs(end.y - start.y)),
+  };
+}
+
+export function resolveFieldRect(anchorPosition, field) {
+  return {
+    x: Math.round(anchorPosition.x + field.offsetX),
+    y: Math.round(anchorPosition.y + field.offsetY),
+    width: Math.round(field.width),
+    height: Math.round(field.height),
+  };
+}
+
+export function normalizeOcrText(text) {
+  return text.replace(/\s+/g, " ").trim();
+}
+
+export function parseFieldValue(type, text) {
+  const normalized = normalizeOcrText(text);
+
+  if (type !== "price" && type !== "quantity") {
+    return normalized;
+  }
+
+  const digits = normalized.replace(/\D/g, "");
+  return digits ? Number(digits) : null;
+}
+
+export function isCalibrationReady(calibration) {
+  return Boolean(
+    calibration?.anchor?.image &&
+      calibration.anchor.width >= 4 &&
+      calibration.anchor.height >= 4 &&
+      calibration.fields?.length,
+  );
+}
+
+export function isRectInside(rect, width, height) {
+  return (
+    rect.x >= 0 &&
+    rect.y >= 0 &&
+    rect.width > 0 &&
+    rect.height > 0 &&
+    rect.x + rect.width <= width &&
+    rect.y + rect.height <= height
+  );
+}