feat(web): add lib/phone.ts with formatPhone/normalizePhone/zaloHref helpers

- Create apps/web/lib/phone.ts with VN_PHONE_REGEX, normalizePhone,
  formatPhone, and zaloHref helpers
- Deduplicate phone regex: auth.ts and inquiry.ts now import VN_PHONE_REGEX
  from @/lib/phone instead of defining their own local patterns
- Replace raw .replace(/^0/, '84') in inquiry-detail-dialog.tsx and
  lead-detail-dialog.tsx with zaloHref(); use formatPhone() for display

Resolves GOO-209

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/web/components/inquiries/inquiry-detail-dialog.tsx

@@ -13,6 +13,7 @@ import {
 } from '@/components/ui/dialog';
 import { useMarkInquiryRead } from '@/lib/hooks/use-inquiries';
 import type { InquiryReadDto } from '@/lib/inquiries-api';
+import { formatPhone, zaloHref } from '@/lib/phone';
 
 interface InquiryDetailDialogProps {
   inquiry: InquiryReadDto | null;
@@ -42,6 +43,8 @@ export function InquiryDetailDialog({ inquiry, open, onOpenChange }: InquiryDeta
     minute: '2-digit',
   });
 
+  const phone = inquiry.phone ?? inquiry.userPhone;
+
   return (
     <Dialog open={open} onOpenChange={onOpenChange}>
       <DialogContent className="max-w-md sm:max-w-lg">
@@ -60,7 +63,7 @@ export function InquiryDetailDialog({ inquiry, open, onOpenChange }: InquiryDeta
               <InquiryStatusBadge isRead={inquiry.isRead} />
             </div>
             <div className="space-y-1 text-sm text-muted-foreground">
-              <p>SĐT: {inquiry.phone ?? inquiry.userPhone}</p>
+              <p>SĐT: {formatPhone(phone)}</p>
               <p>Ngày gửi: {formattedDate}</p>
             </div>
           </div>
@@ -78,13 +81,13 @@ export function InquiryDetailDialog({ inquiry, open, onOpenChange }: InquiryDeta
             <h4 className="text-sm font-medium">Liên hệ nhanh</h4>
             <div className="flex flex-wrap gap-2">
               <a
-                href={`tel:${inquiry.phone ?? inquiry.userPhone}`}
+                href={`tel:${phone}`}
                 className="inline-flex items-center gap-1.5 rounded-md border px-3 py-1.5 text-sm transition-colors hover:bg-accent"
               >
                 <Phone className="h-4 w-4" aria-hidden="true" /> Gọi điện
               </a>
               <a
-                href={`https://zalo.me/${(inquiry.phone ?? inquiry.userPhone).replace(/^0/, '84')}`}
+                href={zaloHref(phone)}
                 target="_blank"
                 rel="noopener noreferrer"
                 className="inline-flex items-center gap-1.5 rounded-md border px-3 py-1.5 text-sm transition-colors hover:bg-accent"