fix(01-03): pet card click navigates to profile page

src/app/(app)/pets/PetGrid.tsx

@@ -51,7 +51,10 @@ export function PetGrid({ pets }: PetGridProps) {
           key={pet.id}
           pet={pet}
           isActive={pet.id === activePetId}
-          onSelect={(id) => setActivePet(id)}
+          onSelect={(id) => {
+            setActivePet(id);
+            router.push(`/pets/${id}`);
+          }}
         />
       ))}
       {/* Add pet card */}