chore: update docs

frontend/src/features/CLAUDE.md

@@ -1,7 +1,5 @@
 # frontend/src/features/
 
-Feature module directory. Each feature contains pages/, components/, hooks/, api/, types/.
-
 ## Subdirectories
 
 | Directory | What | When to read |
@@ -14,6 +12,8 @@ Feature module directory. Each feature contains pages/, components/, hooks/, api
 | `maintenance/` | Maintenance record UI | Service tracking, reminders |
 | `notifications/` | Notification display | Alert UI, notification center |
 | `onboarding/` | Onboarding wizard | First-time user experience |
+| `ownership-costs/` | Ownership cost tracking UI | Cost displays, expense forms |
 | `settings/` | User settings pages | Preferences, account settings |
 | `stations/` | Gas station finder UI | Station search, favorites, map |
+| `subscription/` | Subscription and billing UI | Stripe integration, plan management |
 | `vehicles/` | Vehicle management UI | Vehicle list, details, forms |

frontend/src/features/subscription/CLAUDE.md

@@ -1,12 +1,11 @@
-# frontend/src/features/subscription/
-
-Subscription and billing management feature with Stripe integration.
+# subscription/
 
 ## Files
 
 | File | What | When to read |
 | ---- | ---- | ------------ |
 | `README.md` | Feature overview and API integration | Understanding subscription flow |
+| `index.ts` | Feature barrel export | Importing subscription components |
 
 ## Subdirectories
 
@@ -19,15 +18,3 @@ Subscription and billing management feature with Stripe integration.
 | `pages/` | Desktop subscription page | Desktop implementation |
 | `mobile/` | Mobile subscription screen | Mobile implementation |
 | `constants/` | Subscription plan configurations | Plan pricing and features |
-
-## Key Patterns
-
-- Desktop: MUI components with sx props
-- Mobile: Tailwind classes with GlassCard
-- Stripe Elements for payment methods
-- React Query for data fetching
-- Toast notifications for user feedback
-
-## Environment Variables
-
-- `VITE_STRIPE_PUBLISHABLE_KEY` - Required for Stripe Elements initialization