Unify material supplier and balance controls

src/dataService.ts

@@ -525,6 +525,12 @@ export const fetchSupplySummary = async (): Promise<SupplySummary> => {
     }
 };
 
+export const fetchSupplySuppliers = async (): Promise<string[]> => {
+    const response = await authFetch('/supply/suppliers');
+    if (!response.ok) throw new Error('Não foi possível carregar os fornecedores cadastrados.');
+    return response.json() as Promise<string[]>;
+};
+
 export const saveSupplyMaterialDetails = async (
     materialKey: string,
     payload: SupplyMaterialDetailsPayload