Add full Arabic and right-to-left support to a web app (Next.js App Router and Tailwind first), covering locale routing, dir, logical CSS, mirroring, Arabic typography, numbers, dates, plurals, mixed-direction text, forms, translation and visual QA. Use when the user asks to add Arabic, RTL, or localize an app for Arabic speakers. Don't use for translating a single document.
After editing UI code in a project that supports right-to-left languages (it has i18n.config.json with an Arabic locale), check the changed files for RTL problems such as physical Tailwind classes, hardcoded dir="ltr", unflipped directional icons and locale-less number or date formatting. Read-only. Use when you have just written or changed React, Next.js or CSS files in such a project. Don't use in projects without RTL support.