feature: phase0 - Global patients + mobile normalization

frontend/src/lib/phone.ts

@@ -0,0 +1,44 @@
+/** Canonical Iran mobile: +989XXXXXXXXX */
+export const IR_MOBILE_REGEX = /^\+989\d{9}$/;
+
+export function normalizeMobile(input: string): string | null {
+  const trimmed = input?.trim();
+  if (!trimmed) {
+    return null;
+  }
+
+  let digits = trimmed.replace(/[^\d+]/g, '');
+  if (digits.startsWith('+')) {
+    digits = digits.slice(1);
+  }
+
+  digits = digits.replace(/\D/g, '');
+
+  if (digits.startsWith('0098')) {
+    digits = digits.slice(4);
+  } else if (digits.startsWith('98') && digits.length >= 12) {
+    digits = digits.slice(2);
+  }
+
+  if (digits.startsWith('0') && digits.length === 11) {
+    digits = digits.slice(1);
+  }
+
+  if (digits.length === 10 && digits.startsWith('9')) {
+    return `+98${digits}`;
+  }
+
+  return null;
+}
+
+export function isValidMobile(normalized: string): boolean {
+  return IR_MOBILE_REGEX.test(normalized);
+}
+
+export function formatMobileForDisplay(normalized: string): string {
+  if (!isValidMobile(normalized)) {
+    return normalized;
+  }
+  const local = `0${normalized.slice(3)}`;
+  return `${local.slice(0, 4)} ${local.slice(4, 7)} ${local.slice(7)}`;
+}