refactor: remove redundant = false defaults on boolean props (#9155)

## Summary

Remove redundant `= false` defaults from destructured `defineProps` on
boolean props, since Vue's [Boolean
casting](https://vuejs.org/guide/components/props.html#boolean-casting)
already defaults absent boolean props to `false`.

## Changes

- **What**: Remove 10 unnecessary `= false` default values across 8
components

## Review Focus

Vue compiles `defineProps<{ myBool?: boolean }>()` to `{ myBool: { type:
Boolean, required: false } }`. Boolean casting means absent boolean
props are already `false` — the explicit `= false` in JS destructuring
defaults never triggers.

Follow-up to #9150.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-9155-refactor-remove-redundant-false-defaults-on-boolean-props-3116d73d36508196af0bcba53257720a)
by [Unito](https://www.unito.io)

src/components/breadcrumb/SubgraphBreadcrumbItem.vue

@@ -78,7 +78,7 @@ interface Props {
   isActive?: boolean
 }
 
-const { item, isActive = false } = defineProps<Props>()
+const { item, isActive } = defineProps<Props>()
 
 const nodeDefStore = useNodeDefStore()
 const hasMissingNodes = computed(() =>