fix: 缩小图库关联素材区域的上下内边距

src/admin.css

@@ -1542,7 +1542,7 @@ body {
     display: flex;
     flex-direction: column;
     gap: 10px;
-    padding: 14px 16px;
+    padding: 5px 16px;
     background: var(--app-subtle);
     margin: 0;
     min-width: 0;

src/components/ui/flatTheme.test.ts

@@ -192,7 +192,7 @@ describe('全站平面主题', () => {
             /@container \(max-width: 1200px\)\s*\{\s*\.form-image-toolbar\.has-impact-picker,\s*\.form-image-toolbar\.has-impact-picker\.has-impact-actions\s*\{[^}]*grid-template-columns:\s*minmax\(0, 1fr\);/
         )
         expect(css).toMatch(/\.asset-impact-picker\s*\{[^}]*align-items:\s*center;[^}]*gap:\s*8px;/)
-        expect(css).toMatch(/\.asset-impact-context\s*\{[^}]*gap:\s*10px;[^}]*margin:\s*0;/)
+        expect(css).toMatch(/\.asset-impact-context\s*\{[^}]*gap:\s*10px;[^}]*padding:\s*5px 16px;[^}]*margin:\s*0;/)
     })
 
     it('单图标按钮以当前控件高度为边长，尺寸与内容按钮互不影响', () => {