[mforce]

Supersedes #1425 and #1427, which cannot carry the code change this bump needs.

What and why

• i18next 26.7.1 → 27.1.0 and react-i18next 17.1.11 → 18.0.1. react-i18next 18 peer-requires i18next ≥ 27, so the two only work as one change — hence a single PR rather than the two Dependabot PRs.
• The one code change: NavLabelKey is now ParseKeysWithoutVariables<"nav"> instead of keyof Resources["nav"]. i18next 27 turns strictInterpolationChecks on by default, which refuses keys with required interpolation variables from a no-options t() — including inside a union. nav's one such key is versionLabel ("v{{version}}"), which AppLayout passes with its variable directly; it never rides the nav model. All 7 TS2345 errors (BottomNav ×3, AppLayout ×3, HelpPage ×1) collapse to this one type.

Docs-impact: none — dependency bump plus a type narrowing; no user-visible strings or help content change.

Verification

• npm run typecheck — 0 errors
• npm run test — 183 files, 4425 tests passed
• npm run lint
• npm run build