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1ff68d64e3 i18n: Arabic interface with mirrored RTL shell (+ parity docs) (#5370 )

* Arabic interface: mirrored right-to-left window and Arabic UI fonts

Adds the Arabic (`ar`) interface language's code: its catalogs are craft-i18n's
`locales/ar`, so this changes no catalog.

- `ar` is registered in `i18n::LANGUAGES` and `Lang::rtl()` says it is written
right to left; its translations are used as written (egui's text layout
orders each line's bidi text itself). A ribbon location reads from the right
with a leftwards mark.
- `rtl.rs`: the window is mirrored. Containers open in `rtl::root`; columns,
grids, checkboxes, radio buttons, menus, rows, panels, the dialog tab strip
and the ribbon's scrolling row follow the language's direction. Title bar,
status bar, ribbon tabs and groups, File pages (including Print, with the
settings on the right and a solid scrollbar gutter), dialogs, menus and the
task panes (their docking edge swaps) are laid out from the right. egui's
`Grid` panics in a right-aligned layout, so grids go through `rtl::grid`.
- Arabic UI font fallback: the craft-fonts Arabic face, else an installed
Arabic font, loaded when the interface is Arabic.
- The "Auto (200%)" size label keeps its percent sign inside the isolated
number.
- Tests: Arabic locale, saved preference and lookup order on fixture catalogs;
an interface audit (skipped without the craft-i18n Arabic catalog) that lays
the app out right to left at several widths, checks tab, group, pane, Print
and Go To positions and that nothing panics.

The Arabic work builds on Abdelhaq El Amraoui's mirrored-interface PR (#737).

Co-Authored-By: Abdelhaq El Amraoui <abdelhaqelamraoui@gmail.com>
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

* Arabic interface: pin craft-i18n at a commit with the Arabic catalog; review fixes

- craft-i18n.rev and the Flatpak manifest pin 19358491 (craft-i18n main), the
first commit line that has locales/ar/wordcraft.tsv. The old pin had no
Arabic catalog, so `ar` was registered but not embedded and two i18n tests
(the_language_setting_is_a_ui_command_and_persists,
the_languages_offered_are_the_embedded_ones_of_the_list) failed in CI.
- The Arabic font fallback is requested for any right-to-left interface
(`Lang::rtl()`), not only after the language picker sets the flag, so an
automatic or saved Arabic gets the installed Arabic face.
- The file browser, the update window and Reading Mode's toolbar run their
bodies in `rtl::root`, so their far-side buttons and rows are mirrored.
- A group in a right-to-left ribbon row is measured from the right edge: the
cursor's left edge is negative infinity there, so its width was NaN and the
ribbon planner dropped every group, never compacting a narrow Arabic window.
A narrow window now folds groups into drop-downs.
- The mirrored checkbox and radio marks are labelled by their text, so screen
readers name them.
- Tests: group width in a right-to-left row; the Arabic interface audit checks
Reading Mode's toolbar.