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(() => {

src/components/Discover/Map/Filter/Attributes.vue

@@ -428,8 +428,9 @@ const valueData = computed(() => {
         item.type === selectedAttName.value.type &&
         item.key === selectedAttName.value.key,
     );
-    return data;
+    return data ?? null;
   }
+  return null;
 });
 
 // Compute slider data; time format: millisecond timestamps

src/components/Navbar.vue

@@ -177,6 +177,8 @@ const disabledSave = computed(() => {
       return !(
         conformanceFilterTempCheckId.value || conformanceLogTempCheckId.value
       );
+    default:
+      return true;
   }
 });
 

src/views/Files/Files.vue

@@ -560,6 +560,7 @@ const allFiles = computed(() => {
     );
     return sortFiles;
   }
+  return [];
 });
 
 /**