Sweep 30 files: text/bg/border/ring/from/to/via/fill/stroke/shadow/divide/decoration/
outline/placeholder-red-N → -error-N. All red usages were semantically error/danger
(no brand red), so tokens now flow through the design-system CSS variables and respond
to palette overrides.
- New WebBackButton component: visible on web, hidden in Telegram
(native back button handles navigation there)
- Added to: Subscription detail, SubscriptionPurchase, RenewSubscription
- RenewSubscription: removed max-w-lg, grid layout for period cards
- RenewSubscription: display actual missing amount instead of {{missing}} placeholder
- SubscriptionPurchase: suppress "switch tariff" title in multi-tariff mode
(only renewal exists, no tariff switching)
Renewal flow (per-subscription):
- New /subscriptions/:id/renew page showing only period options for
the specific tariff with balance display and renew button
- PurchaseCTAButton links to /renew in multi-tariff mode
Purchase flow (new tariffs only):
- Hide already purchased tariffs (is_purchased flag from backend)
- Fallback UI when all tariffs are owned
- Types: added is_purchased, all_tariffs_purchased fields
