style: 优化按钮禁用态与主题入口并将设置移至侧栏底部

src/features/production/ProductionPage.vue

@@ -123,9 +123,8 @@ watch(
     <WorkspacePage split compact
         ><template #header
             ><div class="workspace-toolbar">
-                <label class="toolbar-episode"
-                    ><span>剧集</span
-                    ><NSelect
+                <div class="toolbar-episode">
+                    <NSelect
                         :value="episodeNo"
                         aria-label="选择生产剧集"
                         @update:value="selectedEpisode = Number($event)"
@@ -137,8 +136,8 @@ watch(
                             }))
                         ]"
                         class="select-control"
-                    ></NSelect
-                ></label>
+                    ></NSelect>
+                </div>
                 <span class="toolbar-summary"
                     >本集 {{ shots.length }} 镜<span v-if="videoRunning">
                         · {{ videoRunning }} 个视频任务进行中</span

src/features/storyboard/StoryboardPage.vue

@@ -100,9 +100,8 @@ watch(
     <WorkspacePage split compact class="storyboard-workspace-page"
         ><template #header
             ><div class="workspace-toolbar">
-                <label class="toolbar-episode"
-                    ><span>剧集</span
-                    ><NSelect
+                <div class="toolbar-episode">
+                    <NSelect
                         :value="episodeNo"
                         aria-label="选择分镜剧集"
                         @update:value="selectedEpisode = Number($event)"
@@ -114,8 +113,8 @@ watch(
                             }))
                         ]"
                         class="select-control"
-                    ></NSelect
-                ></label>
+                    ></NSelect>
+                </div>
                 <div class="toolbar-metrics">
                     <span v-for="item in coverage" :key="item.title"
                         >{{ item.title }} {{ item.count }} / {{ item.total }}</span