fix: add unique keys for v-for loops in MainPage.vue

src/pages/00_manual/MainPage.vue

@@ -35,6 +35,7 @@ onMounted(async () => {
     <section class="scroll q-gutter-y-sm">
       <q-expansion-item
         v-for="v in dataManual"
+        :key="v.labelEN"
         :content-inset-level="0.5"
         class="rounded overflow-hidden bordered"
         dense
@@ -53,6 +54,7 @@ onMounted(async () => {
 
         <q-item
           v-for="x in v.page"
+          :key="x.labelEN"
           clickable
           dense
           class="dot items-center rounded q-my-xs"