feat(referrals): rework reward engine + email-verified landing

Reward engine:
- Recurring milestones (every 3 → +7d, every 5 → +14d) instead of one-time
  tiers capped at 5; idempotent + transactional grants serialised per
  referrer so concurrent qualifications can't double-count.
- Rewards now gated on the referred user's email verification
  (afterEmailVerification hook); already-verified referees (OAuth) qualify
  at apply time.
- Reward days banked as users.referral_credit_days when the referrer has no
  live subscription, consumed on next trial start / activation (no more
  silently lost rewards).
- Accurate cumulative rewardDays in stats; getMyReferrals returns referee
  name/masked email/status.

Hardening / cleanup:
- onConflictDoNothing makes apply idempotent (no unhandled unique violation).
- Anti-fraud: normalizeEmail blocks self-referral via gmail dot/+tag aliases.
- Collision-safe referral code generation at signup.
- Single apply path (welcome onboarding modal); removed duplicate calls in
  register + subscription pages. Input validation on the apply code.

Email verification UX:
- Verification link now lands on a dedicated /email-verified confirmation
  page instead of the deep-linked VIN/search page.

Schema: referrals.status + qualified_at, users.referral_credit_days (0009).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

apps/web/src/routeTree.gen.ts

@@ -31,6 +31,7 @@ import { Route as AuthResetPasswordRouteImport } from './routes/_auth/reset-pass
 import { Route as AuthRegisterRouteImport } from './routes/_auth/register'
 import { Route as AuthLoginRouteImport } from './routes/_auth/login'
 import { Route as AuthForgotPasswordRouteImport } from './routes/_auth/forgot-password'
+import { Route as AuthEmailVerifiedRouteImport } from './routes/_auth/email-verified'
 import { Route as DashboardSubscriptionIndexRouteImport } from './routes/dashboard/subscription/index'
 import { Route as DashboardCatalogIndexRouteImport } from './routes/dashboard/catalog/index'
 import { Route as DashboardAdminIndexRouteImport } from './routes/dashboard/admin/index'
@@ -160,6 +161,11 @@ const AuthForgotPasswordRoute = AuthForgotPasswordRouteImport.update({
   path: '/forgot-password',
   getParentRoute: () => AuthRoute,
 } as any)
+const AuthEmailVerifiedRoute = AuthEmailVerifiedRouteImport.update({
+  id: '/email-verified',
+  path: '/email-verified',
+  getParentRoute: () => AuthRoute,
+} as any)
 const DashboardSubscriptionIndexRoute =
   DashboardSubscriptionIndexRouteImport.update({
     id: '/subscription/',
@@ -280,6 +286,7 @@ export interface FileRoutesByFullPath {
   '/pricing': typeof PricingRoute
   '/privacy': typeof PrivacyRoute
   '/terms': typeof TermsRoute
+  '/email-verified': typeof AuthEmailVerifiedRoute
   '/forgot-password': typeof AuthForgotPasswordRoute
   '/login': typeof AuthLoginRoute
   '/register': typeof AuthRegisterRoute
@@ -321,6 +328,7 @@ export interface FileRoutesByTo {
   '/pricing': typeof PricingRoute
   '/privacy': typeof PrivacyRoute
   '/terms': typeof TermsRoute
+  '/email-verified': typeof AuthEmailVerifiedRoute
   '/forgot-password': typeof AuthForgotPasswordRoute
   '/login': typeof AuthLoginRoute
   '/register': typeof AuthRegisterRoute
@@ -365,6 +373,7 @@ export interface FileRoutesById {
   '/pricing': typeof PricingRoute
   '/privacy': typeof PrivacyRoute
   '/terms': typeof TermsRoute
+  '/_auth/email-verified': typeof AuthEmailVerifiedRoute
   '/_auth/forgot-password': typeof AuthForgotPasswordRoute
   '/_auth/login': typeof AuthLoginRoute
   '/_auth/register': typeof AuthRegisterRoute
@@ -409,6 +418,7 @@ export interface FileRouteTypes {
     | '/pricing'
     | '/privacy'
     | '/terms'
+    | '/email-verified'
     | '/forgot-password'
     | '/login'
     | '/register'
@@ -450,6 +460,7 @@ export interface FileRouteTypes {
     | '/pricing'
     | '/privacy'
     | '/terms'
+    | '/email-verified'
     | '/forgot-password'
     | '/login'
     | '/register'
@@ -493,6 +504,7 @@ export interface FileRouteTypes {
     | '/pricing'
     | '/privacy'
     | '/terms'
+    | '/_auth/email-verified'
     | '/_auth/forgot-password'
     | '/_auth/login'
     | '/_auth/register'
@@ -696,6 +708,13 @@ declare module '@tanstack/react-router' {
       preLoaderRoute: typeof AuthForgotPasswordRouteImport
       parentRoute: typeof AuthRoute
     }
+    '/_auth/email-verified': {
+      id: '/_auth/email-verified'
+      path: '/email-verified'
+      fullPath: '/email-verified'
+      preLoaderRoute: typeof AuthEmailVerifiedRouteImport
+      parentRoute: typeof AuthRoute
+    }
     '/dashboard/subscription/': {
       id: '/dashboard/subscription/'
       path: '/subscription'
@@ -833,6 +852,7 @@ declare module '@tanstack/react-router' {
 }
 
 interface AuthRouteChildren {
+  AuthEmailVerifiedRoute: typeof AuthEmailVerifiedRoute
   AuthForgotPasswordRoute: typeof AuthForgotPasswordRoute
   AuthLoginRoute: typeof AuthLoginRoute
   AuthRegisterRoute: typeof AuthRegisterRoute
@@ -840,6 +860,7 @@ interface AuthRouteChildren {
 }
 
 const AuthRouteChildren: AuthRouteChildren = {
+  AuthEmailVerifiedRoute: AuthEmailVerifiedRoute,
   AuthForgotPasswordRoute: AuthForgotPasswordRoute,
   AuthLoginRoute: AuthLoginRoute,
   AuthRegisterRoute: AuthRegisterRoute,