fix: remove redundant chapter picker title

src/components/StoryGallery.vue

@@ -260,7 +260,6 @@ const tree = computed(() => buildTreeForChapter(currentChapterId.value))
       <Transition name="picker-fade">
         <div v-if="showChapterPicker" class="chapter-picker" @click.self="showChapterPicker = false">
           <div class="picker-panel">
-            <h3 class="picker-title">{{ t('ui.chapters') }}</h3>
             <div class="picker-grid">
               <div
                 v-for="ch in chaptersByProgress()"
@@ -515,15 +514,6 @@ const tree = computed(() => buildTreeForChapter(currentChapterId.value))
   box-shadow: 0 -1px 12px rgba(0,0,0,0.25);
 }
 
-.picker-title {
-  text-align: center;
-  font-size: 20px;
-  font-weight: 500;
-  color: #c9a84c;
-  letter-spacing: 3px;
-  margin-bottom: 24px;
-}
-
 .picker-grid {
   display: flex;
   gap: 16px;