fix: portal mobile overflow — hide scrollbar on PetProfiles tab row

- Add scrollbar-hide CSS utility to index.css (webkit + Firefox + IE)
- Apply scrollbar-hide to PetProfiles tab overflow-x-auto row
- BillingPayments.tsx already has overflow-x-auto + flex-wrap on dev; no change needed

Fixes GRO-730: My Pets (+52px) and Billing (+61px) at 390px viewport

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

apps/web/src/portal/sections/PetProfiles.tsx

@@ -182,7 +182,7 @@ export function PetProfiles({ sessionId, readOnly }: Props) {
       )}
 
       {/* Tabs */}
-      <div className="flex gap-1 bg-white rounded-xl border border-stone-200 p-1 overflow-x-auto">
+      <div className="flex gap-1 bg-white rounded-xl border border-stone-200 p-1 overflow-x-auto scrollbar-hide">
         {([
           { id: "info", label: "Basic Info", icon: PawPrint },
           { id: "medical", label: "Medical", icon: Heart },