Both code paths that touch the updater now consult `check_entitlement`
from the Rust entitlements module before calling `check()`:
- `useUpdater.ts` adds a `notEntitled` status; on Free, the check
short-circuits and the Settings page displays an upgrade hint instead
of fetching update metadata.
- `ErrorPage.tsx` (recovery screen) does the same so the error path
matches the main path; users on Free no longer see network errors when
the updater would have run.
The gate name (`auto-update`) is the same string consumed by
`commands/entitlements.rs::FEATURE_TIERS`, so changing which tier
unlocks updates is a one-line edit in that file.
Bilingual i18n keys for the new messages are added to both `fr.json`
and `en.json`. CHANGELOG entries in both languages.
