fix(copy): prevent shorthand copy if source is present in useCopy (#559)

* fix(copy): prevent shorthand copy if source is present in useCopy

* refactor(copy): normalized copy usage

src/tools/basic-auth-generator/basic-auth-generator.vue

@@ -30,7 +30,7 @@ const { copy } = useCopy({ source: header, text: 'Header copied to the clipboard
       </n-statistic>
     </c-card>
     <div mt-5 flex justify-center>
-      <c-button @click="copy">
+      <c-button @click="copy()">
         Copy header
       </c-button>
     </div>