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.
Adds the user-facing layer on top of the Rust license commands shipped
in #46.
- `licenseService.ts` thin wrapper around the new Tauri commands
- `useLicense` hook follows the project's useReducer pattern (idle,
loading, ready, validating, error) and exposes `submitKey`,
`refresh`, and `checkEntitlement` for cross-component use
- `LicenseCard` shows the current edition, the expiry date when set,
accepts a license key with inline validation feedback, and links to
the purchase page via `openUrl` from `@tauri-apps/plugin-opener`
- Card is inserted at the top of `SettingsPage` so the edition is the
first thing users see when looking for license-related actions
- i18n: new `license.*` keys in both `fr.json` and `en.json`
- Bilingual CHANGELOG entries
