localization: ship fr-FR

Complete French catalog across all three namespaces (app/panel/ui),
1129 keys, machine-translated then reviewed for the two things that
go wrong automatically: technical vocabulary and plurals.

Fixed on review: a gender-agreement slip ("décrivez-la" referring to
the masculine "Prompt", should be "décrivez-le") and an incomplete
verb construction in agentRunner.keepsGoing. Also reverted "Minesweeper"
→ "Démineur" back to the untranslated proper name, matching pt-PT's
own precedent of not translating this bundled app's name.

French is the language where the 0/1/2 plural check actually bites:
Intl.PluralRules puts count=0 in the SAME category as count=1 ("one"),
unlike English/Portuguese/German/Spanish where 0 is "other". All 17
plural entries were verified against 0, 1 and 2 rather than trusting
the category names — the "one" branch is phrased as a plain singular
so it reads correctly for both 0 and 1.

Parity tests now check every non-en locale in one assertion instead
of hardcoding pt-PT; SHIPPED_LOCALES gains fr-FR so the picker offers
it. es-ES and de-DE catalogs are drafted and under review — held out
of this commit and out of SHIPPED_LOCALES until each passes its own
review, so a half-translated locale never reaches the picker.

src/apps/officer-web/lib/locales.ts

@@ -19,7 +19,7 @@ const autonym = (code: string): string => {
   return name.charAt(0).toUpperCase() + name.slice(1);
 };
 
-export const SHIPPED_LOCALES: ShippedLocale[] = ['en-GB', 'pt-PT'].map((code) => ({
+export const SHIPPED_LOCALES: ShippedLocale[] = ['en-GB', 'pt-PT', 'fr-FR'].map((code) => ({
   code,
   label: autonym(code),
 }));