Add RTL document direction detection

[bilbo-22]

Summary

• detect common RTL locales from the browser preferred language list
• set document.documentElement.dir to rtl at app startup
• keep the change limited to a few lines in the web entrypoint

Testing

• not run (kept minimal; no dependency install in this environment)

Note

Add RTL document direction detection based on browser locale

In main.tsx, sets document.documentElement.dir to "rtl" or "ltr" at startup based on the user's browser language. The detected locale is derived from navigator.languages (first non-empty entry) with a fallback to navigator.language, and is matched against a regex covering ar, dv, fa, he, ku, ps, sd, ug, ur, and yi.

^{Macroscope summarized 4c042dc.}

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