feat: 完善课程学习与技能树体验

完善课程资源、学习进度与技能树解锁体验，统一视频播放与引导相关交互。

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/views/film/after-editing/editing/cut.vue

@@ -3,7 +3,7 @@ import { ref } from 'vue'
 import { useRouter } from 'vue-router'
 import { ImgButton } from '@/components/Button'
 import { Video } from '@/components'
-import { getPublicPath, IMAGE_PATHS } from '@/utils'
+import { getPublicPath, IMAGE_PATHS, getVideoPoster } from '@/utils'
 import { useFilmStore } from '@/stores'
 
 const router = useRouter()
@@ -30,6 +30,7 @@ const handleVideoEnded = () => {
     <Video
       class="w-full h-full"
       :src="cutVideoUrl"
+      :poster="getVideoPoster(cutVideoUrl)"
       v-model="videoPlaying"
       :muted="false"
       :volume="1"