docs(01-06): complete subscription management plan

Tasks completed: 3/3
- Task 1: Plan utilities and types
- Task 2: Plan card component and switch action
- Task 3: Subscription management page

PHASE 1 COMPLETE - Foundation & Auth finished
SUMMARY: .planning/phases/01-foundation-auth/01-06-SUMMARY.md

.planning/phases/01-foundation-auth/01-06-SUMMARY.md

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+---
+phase: 01-foundation-auth
+plan: 06
+subsystem: ui
+tags: [subscription, plans, server-actions, react]
+
+# Dependency graph
+requires:
+  - phase: 01-05
+    provides: Dashboard layout and protected routes
+provides:
+  - Subscription management page
+  - Plan switching server action
+  - Plan card reusable component
+  - Plan types and utilities
+affects: [payments, feature-limits, billing]
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns:
+    - Server action for database updates with revalidation
+    - Type-safe plan features with PlanFeatures interface
+
+key-files:
+  created:
+    - src/app/(dashboard)/subscription/page.tsx
+    - src/app/actions/subscription.ts
+    - src/components/subscription/plan-card.tsx
+    - src/lib/plans.ts
+    - src/types/database.ts
+  modified: []
+
+key-decisions:
+  - "Plan switching is immediate (no billing period scheduling yet)"
+  - "Payment deferred with visible user notice"
+  - "All plan text in Italian"
+
+patterns-established:
+  - "Server actions for data mutations with revalidatePath"
+  - "Type definitions in src/types/ directory"
+  - "Plan utilities centralized in src/lib/plans.ts"
+
+# Metrics
+duration: 3min
+completed: 2026-01-31
+---
+
+# Phase 01 Plan 06: Subscription Management Summary
+
+**Subscription page with plan display, feature comparison, and instant plan switching via server actions**
+
+## Performance
+
+- **Duration:** 3 min
+- **Started:** 2026-01-31T12:41:11Z
+- **Completed:** 2026-01-31T12:43:48Z
+- **Tasks:** 3
+- **Files created:** 5
+
+## Accomplishments
+- Complete subscription management page at /subscription
+- Plan card component showing features with switch button
+- Server action for instant plan switching with database update
+- Feature comparison table with all plan limits
+- FAQ section for common subscription questions
+- Payment deferral notice for transparency
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Create plan utilities and types** - `7bdc6d3` (feat)
+2. **Task 2: Create plan card component and switch action** - `8789f26` (feat)
+3. **Task 3: Create subscription page** - `e4e04fa` (feat)
+
+## Files Created
+
+- `src/types/database.ts` - Plan, PlanFeatures, Profile type definitions
+- `src/lib/plans.ts` - Plan utilities (formatPrice, formatFeatureValue, getPlanBadgeColor)
+- `src/app/actions/subscription.ts` - switchPlan server action and getCurrentPlan utility
+- `src/components/subscription/plan-card.tsx` - Reusable PlanCard component
+- `src/app/(dashboard)/subscription/page.tsx` - Subscription management page
+
+## Decisions Made
+- Plan switching is immediate without billing period delay (payment not implemented yet)
+- Visible notice that payment system is coming in future versions
+- All UI text in Italian per project requirements
+- Feature comparison uses unicode checkmarks for cross-platform compatibility
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+
+None - build passes, all TypeScript types correct.
+
+## User Setup Required
+
+None - no external service configuration required.
+
+## Next Phase Readiness
+
+- Phase 1 (Foundation & Auth) is now COMPLETE
+- All 6 plans executed successfully
+- Ready for Phase 2: Social Connections
+- Subscription management ready for payment integration in later phase
+
+---
+*Phase: 01-foundation-auth*
+*Completed: 2026-01-31*