feat(desktop): add font-family picker with CJK-optimized presets#3378
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Default font stack now prioritises PingFang SC / Microsoft YaHei / Noto Sans SC so Chinese text renders consistently on every platform instead of falling back to Song / SimSun on Windows. Users can switch between System, Microsoft YaHei, PingFang, and Noto Sans presets from Settings → Appearance. The selection persists in localStorage and the data-font-family attribute is applied before the first React render to avoid flicker. Closes #3036
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Summary
data-font-familyHTML 属性 + CSS 变量覆盖实现，在 React 首帧渲染前生效，无闪烁Closes #3036.
How it works
lib/fontFamily.tstextSize.ts模式styles.css[data-font-family="yahei/pingfang/noto"]覆盖规则main.tsxinitFontFamily()在首帧前同步调用SettingsPanel.tsxlocales/*.tsTest plan
cd desktop/frontend && npx tsc --noEmit通过pnpm run build成功