Enable vue/return-in-computed-property and add explicit fallback returns

Co-Authored-By: Codex <codex@openai.com>

src/components/Discover/Conformance/MoreModal.vue

@@ -195,6 +195,7 @@ const caseData = computed(() => {
     });
     return data;
   }
+  return [];
 });
 
 const columnData = computed(() => {