Dhivehi localization and RTL

Every user-facing string is translatable, with lang/en and lang/dv
Real Dhivehi translations; uncertain ones are listed for human review
Views and components work in RTL (logical utilities only) and free-text inputs support Thaana
Tests use Thaana for user-facing behaviour

Document v3 for people and agents; add the Boost guideline and skill

Done on next-gen:

Every string in src goes through __() with an English key, in lang/en.json and lang/dv.json. TranslationsTest fails if a source string is missing from either file, or isn't Thaana in dv.
Uncertain translations are listed for review in docs/advanced-usage/translations.md. "Delete" is spelt ފުހެލުން, to match javaabu/forms' ފުހެލާ.
Tests use Thaana for user-facing data: role descriptions, search, and the Dhivehi edit page.

What's left: RTL and Thaana input in the role pages, which waits on #10 (blocked).

RTL and Thaana are done for the views.

Logical utilities only: a test rejects ml-, text-left and the like in the Blade views.
Direction: descriptions use dir="auto", and names and guards are dir="ltr". With translatable, the Dhivehi description input gets dir="rtl", lang="dv" and the Thaana keyboard.
Strings: 22 new strings in lang/dv.json. The translation test now also scans the Blade views, and the review table in docs/advanced-usage/translations.md is updated.

Navigation Menu