docs: refresh bilingual product screenshots

docs/desktop/settings.md

@@ -35,7 +35,7 @@ order: 6
 - **界面缩放** — 整体放大缩小，也可以用 `⌘+` / `⌘-` 快捷键，`⌘0` 回到 100%。
 - **数据存储位置** — 低频高级设置。默认用系统目录 `~/.claude`，也可以改成你指定的绝对路径。切换后会话记录、技能、MCP、插件、服务商配置全部从新目录读取，需要重启应用生效，两个目录之间不会自动合并或迁移。
 
-![同一条会话在「墨夜」深色主题下的样子](../images/app/zh-CN/session-dark.webp)
+本文的产品截图统一使用「纯白」主题，避免不同配色影响界面对比。
 
 ## H5 访问
 

docs/en/desktop/settings.md

@@ -35,7 +35,7 @@ The tab you'll open most often — everything about how the app feels.
 - **UI Zoom** — scale the whole interface, also bound to `⌘+` / `⌘-`, with `⌘0` back to 100%.
 - **Data Storage Location** — an advanced, rarely-touched setting. Defaults to the system directory `~/.claude`, or point it at an absolute path of your own. After switching, sessions, skills, MCP, plugins, and provider config are all read from the new directory; it needs a restart, and the two directories are never merged or migrated automatically.
 
-![The same session in the Ink Night dark theme](../../images/app/en/session-dark.webp)
+Product screenshots in this guide consistently use the **Pure White** theme so the interface can be compared without palette changes.
 
 ## H5 Access