新增欢迎页

src/views/Stage.vue

@@ -18,6 +18,7 @@
       @update:active-tool="activeTool = $event"
       @update:show-settings="showSettings = $event"
       @update:show-help="showHelp = $event"
+      @home="emit('home')"
       @clear-background="clearBackground"
       @background-file="onBackgroundFileChange"
     />
@@ -60,6 +61,7 @@ import { sampleScenePath } from '../core/scenePathSampler'
 import { followCurveValue } from './stage/stageGeometry'
 
 const store = useParticleStore()
+const emit = defineEmits<{ (e: 'home'): void }>()
 const holder = ref<HTMLElement | null>(null)
 const info = ref<{ systems: number; particles: number } | null>(null)
 const showSettings = ref(false)