feat(01-06): add plan types and utilities

- Add Plan and PlanFeatures TypeScript interfaces
- Add Profile type with plan relationship
- Create plan utility functions with Italian labels
- Add formatPrice, formatFeatureValue, getPlanBadgeColor helpers

src/lib/plans.ts

@@ -0,0 +1,49 @@
+import { PlanFeatures } from '@/types/database'
+
+export const PLAN_DISPLAY_ORDER = ['free', 'creator', 'pro'] as const
+
+// Feature display names in Italian
+export const FEATURE_LABELS: Record<keyof PlanFeatures, string> = {
+  posts_per_month: 'Post al mese',
+  ai_models: 'Modelli AI',
+  social_accounts: 'Account social',
+  image_generation: 'Generazione immagini',
+  automation: 'Automazione',
+}
+
+export function formatFeatureValue(
+  key: keyof PlanFeatures,
+  value: PlanFeatures[keyof PlanFeatures]
+): string {
+  if (typeof value === 'boolean') {
+    return value ? 'Incluso' : 'Non incluso'
+  }
+
+  if (Array.isArray(value)) {
+    return value.length.toString()
+  }
+
+  if (key === 'automation') {
+    if (value === 'manual') return 'Solo manuale'
+    if (value === 'full') return 'Completa'
+    return 'Non inclusa'
+  }
+
+  return value.toString()
+}
+
+export function formatPrice(cents: number): string {
+  if (cents === 0) return 'Gratis'
+  return `${(cents / 100).toFixed(0)}/mese`
+}
+
+export function getPlanBadgeColor(planName: string): string {
+  switch (planName) {
+    case 'pro':
+      return 'bg-purple-100 text-purple-800 border-purple-200'
+    case 'creator':
+      return 'bg-blue-100 text-blue-800 border-blue-200'
+    default:
+      return 'bg-gray-100 text-gray-800 border-gray-200'
+  }
+}

src/types/database.ts

@@ -0,0 +1,29 @@
+export interface Plan {
+  id: string
+  name: 'free' | 'creator' | 'pro'
+  display_name: string
+  display_name_it: string
+  price_monthly: number
+  features: PlanFeatures
+  created_at: string
+}
+
+export interface PlanFeatures {
+  posts_per_month: number
+  ai_models: string[]
+  social_accounts: number
+  image_generation: boolean
+  automation: boolean | 'manual' | 'full'
+}
+
+export interface Profile {
+  id: string
+  tenant_id: string
+  plan_id: string
+  email: string
+  full_name: string | null
+  avatar_url: string | null
+  created_at: string
+  updated_at: string
+  plans?: Plan
+}