Feature Policies API + Invitations Policies (#375)

- Added Feature Policy API: a declarative system to enable/disable/modify default behavior in the SaaS kit
- Team invitation policies with pre-checks using the Feature Policy API: Invite Members dialog now shows loading, errors, and clear reasons when invitations are blocked
- Version bump to 2.16.0 and widespread dependency updates (Supabase, React types, react-i18next, etc.).
- Added comprehensive docs for the new policy system and orchestrators.
- Subscription cancellations now trigger immediate invoicing explicitly

packages/ui/package.json

@@ -25,10 +25,10 @@
     "@kit/eslint-config": "workspace:*",
     "@kit/prettier-config": "workspace:*",
     "@kit/tsconfig": "workspace:*",
-    "@supabase/supabase-js": "2.57.4",
+    "@supabase/supabase-js": "2.58.0",
     "@tanstack/react-query": "5.90.2",
     "@tanstack/react-table": "^8.21.3",
-    "@types/react": "19.1.13",
+    "@types/react": "19.1.15",
     "@types/react-dom": "19.1.9",
     "class-variance-authority": "^0.7.1",
     "date-fns": "^4.1.0",
@@ -38,7 +38,7 @@
     "prettier": "^3.6.2",
     "react-day-picker": "^9.11.0",
     "react-hook-form": "^7.63.0",
-    "react-i18next": "^15.7.3",
+    "react-i18next": "^16.0.0",
     "sonner": "^2.0.7",
     "tailwindcss": "4.1.13",
     "tailwindcss-animate": "^1.0.7",