[chenjingxiong]

Summary

• Add font size options (Small, Default, Large, Extra Large) and UI zoom ratio options (80% - 200%) to Appearance Settings.
• Implement UI font size adjustments across CSS typography tokens and Terminal view.
• Expose Electron \webFrame.setZoomFactor\ bridge in preload with fallback to CSS zoom in browser mode, supporting \Ctrl/Cmd +/=/-\ and \Ctrl/Cmd 0\ shortcuts.
• Support complete i18n translations across en, zh, ja, and zh-Hant.

Verification

• Unit tests: \ui/src/theme/store.spec.ts, \ui/src/pages/SettingsPage.appearance.spec.tsx\
• Typechecks:
  px tsc --noEmit, \cd ui && npx tsc -b, \pnpm -F @traderalice/desktop typecheck\
• Built and packaged desktop app

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