style: 脚本生成页去掉分类标题，缩小按钮高度

tauri-app/src/pages/VideoCreation/ScriptCreation.css

@@ -22,14 +22,14 @@
 
 .topic-groups .option-card {
   min-width: 0;
-  padding: var(--spacing-md) var(--spacing-sm);
+  padding: var(--spacing-sm) var(--spacing-xs);
   font-size: var(--font-base);
   display: flex;
   flex-direction: column;
   align-items: center;
   justify-content: center;
   gap: var(--spacing-2xs);
-  min-height: 52px;
+  min-height: 40px;
   border-radius: var(--radius-lg);
   border: 1px solid var(--border-color);
   background: linear-gradient(145deg, #ffffff 0%, #f8faf9 100%);

tauri-app/src/pages/VideoCreation/ScriptCreation.tsx

@@ -348,7 +348,6 @@ export default function ScriptCreation() {
           <label className="panel-label">创作主题</label>
           {categories.map((cat) => (
             <div key={cat.code}>
-              <div className="topic-category-title">{cat.name}</div>
               <div className="topic-groups">
                 {cat.files.map((file) => (
                   <button