fix: remove default value for injected isDark in ThemeAwareMarkdownCodeBlock

Author: Soulter

dashboard/src/components/shared/ThemeAwareMarkdownCodeBlock.vue

@@ -26,9 +26,9 @@ const props = defineProps<{
   isDark?: boolean;
 }>();
 
-const injectedIsDark = inject<Ref<boolean> | boolean>("isDark", undefined);
+const injectedIsDark = inject<Ref<boolean> | boolean>("isDark");
 const effectiveIsDark = computed(
-  () => props.isDark ?? (injectedIsDark instanceof Object && 'value' in injectedIsDark ? injectedIsDark.value : injectedIsDark) ?? false,
+  () => props.isDark ?? (injectedIsDark instanceof Object && "value" in injectedIsDark ? injectedIsDark.value : injectedIsDark) ?? false,
 );
 
 const attrs = useAttrs();