Revamp Done - Support for Individual and Jwellery module added

kifi-app/lib/core/utils/purity_utils.dart

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+/// Utility functions for gold/silver purity factor calculation and formatting.
+/// Standard rule: Purity is represented as a fraction between 0.0 and 1.0 (e.g. 0.916 for 22KT / 91.6%).
+/// If a raw value > 1.0 is supplied (such as 91.6 or 75.0), it is normalized by dividing by 100 with a maximum of 1.0.
+
+double normalizePurity(num? rawPurity) {
+  if (rawPurity == null || rawPurity <= 0) return 1.0;
+  double p = rawPurity.toDouble();
+  if (p > 1.0) {
+    p = p / 100.0;
+  }
+  if (p > 1.0) {
+    p = 1.0;
+  }
+  return p;
+}
+
+String formatPurity(num? rawPurity) {
+  final p = normalizePurity(rawPurity);
+  return p.toStringAsFixed(3);
+}
+
+/// Resolves purity factor prioritizing the category (metal grade e.g. 22KT -> 0.916)
+/// then falling back to product-specific purity or 1.0.
+double resolvePurity({num? categoryPurity, num? productPurity}) {
+  if (categoryPurity != null && categoryPurity > 0) {
+    return normalizePurity(categoryPurity);
+  }
+  if (productPurity != null && productPurity > 0) {
+    return normalizePurity(productPurity);
+  }
+  return 1.0;
+}