Add Persian (fa) locale with RTL support

[Satan2049]

Summary

• Add Persian (fa) as a fully supported UI language with 982 translated strings
• Enable RTL layout for Persian using the same behavior as Arabic (sidebar, drawers, theme direction, Cairo font)
• Register fa across locale parsing, settings schema, i18n resources, and tooling configs
• Update README docs to list Persian in supported languages

Changes

Area	What changed
Translations	src/renderer/i18n/locales/fa/translation.json (new)
RTL	src/renderer/i18n/rtl.ts with isRtlLanguage() for ar + fa
i18n wiring	index.ts, locales.ts, parser.ts, i18next-parser.config.mjs, script/translate.mjs
Types	src/shared/types.ts, src/shared/types/settings.ts
UI RTL	__root.tsx, Sidebar.tsx, StyledMenu.tsx, ThreadHistoryDrawer.tsx, useAppTheme.ts
Misc	accept-language.ts, openLinkWithAuth.ts
Docs	README.md, doc/README-CN.md

Test plan

• pnpm install
• pnpm run dev
• Open Settings → General → Language and select فارسی
• Verify RTL: sidebar on the right, text direction right-to-left
• Browse main screens (chat, settings, knowledge base) and confirm Persian strings render correctly
• Switch back to English and confirm LTR restores
• pnpm run check
• pnpm run lint

Screenshots

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[Satan2049]

[itxaiohanglover]

Nice addition! Persian locale with RTL support is important for Farsi-speaking users. Updating the i18next parser config and both READMEs is thorough.

[Satan2049]

Nice addition! Persian locale with RTL support is important for Farsi-speaking users. Updating the i18next parser config and both READMEs is thorough.

Thanks bro

[Behzad9]

Please also change the font to a more suitable Persian font, such as Vazir. The current font, being Arabic, is not appropriate for Persian text.