feat(locales): add French translation (fr)

[Zutyosh]

Adds locales/fr.json — a complete French catalog, 5506/5506 keys (100%).

bun scripts/validate-locales.ts fr should print:

ok    fr       100% translated  (5506/5506)

What was done

• Copied en.json, translated values only — keys, order and JSON shape untouched.
• Every {placeholder} preserved, including ones nested inside plural/select
  branch bodies ({delta}, {count, number}).
• ICU plurals keep their plural wrapper and an other branch; empty =0
  branches and select keywords (one/other/yes/on/global/running…) are
  untouched — only branch bodies are translated.
• Product names left as-is: Empryo, Forge, Genome, Marionette, Hearth, SoulForge,
  Claude, OpenAI, GitHub, JSON, API, MCP, LSP, fff, DevPass, Grok, Copilot.
• command.*.name values are single unaccented ASCII tokens so they stay
  typeable on any keyboard (apropos, jalon-annuler, git-remise,
  abonnements-statut); acronyms untouched (mcp, lsp, fff, git).
  No duplicates, no spaces, no slashes.
• No control, escape, bidi or zero-width characters; nothing pasted from a
  terminal. Longest value is well under the 400-char limit.
• Length kept close to the English (~1.2× on average) so fixed-width panels
  still fit; the 331 values identical to English are terms that are already
  French or untranslatable (Git, Chat, Auto, Console, Ctrl+K, stdio, distro
  names…).

Note

desktop.settings-drawer.type-slash-commands-in-this-language uses a French
example (/langue for /language) instead of the Arabic one from the English
string, which keeps the catalog free of any RTL text.

[coderabbitai]

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[proxysoul]

Validated locally: 5506/5506 keys against the published en.json, placeholders and plural wrappers intact, no control/bidi/zero-width characters, all 162 command names unique ASCII with no collisions. Spot-checked the prose — idiomatic and consistent. Merci !