Add the reusable gating guard components on top of the #297 foundation:
- UpsellGate: full locked screen (lock icon, tier title, per-feature
description). Two CTAs: "Get <tier>" rendered VISIBLE but DISABLED with
an "online purchase coming soon" note (per planning decision — #270 will
activate it), and "I already have a key" navigating to /settings/users
(LicenseCard).
- RequireFeature: renders a neutral loader while the license is not ready
(no upsell flash at boot), then children or UpsellGate. Renders <Outlet/>
when children are omitted so it also works as a layout route grouping
all routes of one feature.
- requiredTierFor() pure helper in shared/entitlements.ts derives the
minimum unlocking tier from matrix membership (not array order).
- i18n: upsell.* (title, per-feature descriptions, CTAs) + nav.locked in
BOTH locales; tier labels reuse the existing license.editions.* keys.
- Tests: requiredTierFor mapping/minimality + upsell i18n coverage for
every FeatureKey in fr and en (the components themselves are not
testable without jsdom).
Resolves#298
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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