feat(admin): consentement aux annonces et désabonnement sans connexion

Les comptes déjà créés ne sont pas inscrits. Le choix est facultatif à l’inscription et dans les paramètres. Un lien public demande confirmation avant d’arrêter les actualités, sans toucher aux messages de compte.

memento-note/app/(main)/settings/general/general-settings-client.tsx

@@ -6,7 +6,8 @@ import { useLanguage } from '@/lib/i18n'
 import { updateAISettings } from '@/app/actions/ai-settings'
 import { toast } from 'sonner'
 import { useRouter, useSearchParams } from 'next/navigation'
-import { Globe, Bell, Shield, Brain, HelpCircle } from 'lucide-react'
+import { Globe, Bell, Shield, Brain, HelpCircle, Mail } from 'lucide-react'
+import { updateMyMarketingPreference } from '@/app/actions/marketing-preference'
 import { motion } from 'motion/react'
 import { openCookiePreferences } from '@/lib/consent/cookie-consent'
 import { useAiConsent } from '@/components/legal/ai-consent-provider'
@@ -21,10 +22,14 @@ interface GeneralSettingsClientProps {
     desktopNotifications: boolean
     autoSave: boolean
   }
+  initialMarketing?: {
+    optedIn: boolean
+    blocked: boolean
+  }
 }
 
-export function GeneralSettingsClient({ initialSettings }: GeneralSettingsClientProps) {
-  const { t, setLanguage: setContextLanguage } = useLanguage()
+export function GeneralSettingsClient({ initialSettings, initialMarketing }: GeneralSettingsClientProps) {
+  const { t, language: uiLanguage, setLanguage: setContextLanguage } = useLanguage()
   const { hasAiConsent, revokeConsent, requestAiConsent } = useAiConsent()
   const router = useRouter()
   const searchParams = useSearchParams()
@@ -45,6 +50,9 @@ export function GeneralSettingsClient({ initialSettings }: GeneralSettingsClient
   const [emailNotifications, setEmailNotifications] = useState(initialSettings.emailNotifications ?? false)
   const [desktopNotifications, setDesktopNotifications] = useState(initialSettings.desktopNotifications ?? false)
   const [autoSave, setAutoSave] = useState(initialSettings.autoSave ?? true)
+  const [marketingOptIn, setMarketingOptIn] = useState(initialMarketing?.optedIn === true)
+  const [marketingBlocked] = useState(initialMarketing?.blocked === true)
+  const [marketingSaving, setMarketingSaving] = useState(false)
 
   const handleLanguageChange = async (value: string) => {
     setLanguage(value)
@@ -80,6 +88,20 @@ export function GeneralSettingsClient({ initialSettings }: GeneralSettingsClient
     toast.success(t('settings.settingsSaved'))
   }
 
+  const handleMarketingChange = async (enabled: boolean) => {
+    if (marketingBlocked) return
+    setMarketingSaving(true)
+    setMarketingOptIn(enabled)
+    const result = await updateMyMarketingPreference(enabled, uiLanguage)
+    setMarketingSaving(false)
+    if (!result.ok) {
+      setMarketingOptIn(!enabled)
+      toast.error(t(result.error === 'blocked' ? 'settings.marketingBlocked' : 'settings.settingsSaveFailed'))
+      return
+    }
+    toast.success(t('settings.settingsSaved'))
+  }
+
   return (
     <motion.div
       initial={{ opacity: 0, y: 10 }}
@@ -222,6 +244,38 @@ export function GeneralSettingsClient({ initialSettings }: GeneralSettingsClient
           </div>
         </div>
 
+        <div className="bg-white/40 dark:bg-white/5 border border-border rounded-xl p-8 space-y-6 md:col-span-2">
+          <div className="flex items-start justify-between gap-4">
+            <div className="flex items-center gap-5">
+              <div className="p-3 bg-paper dark:bg-white/10 rounded-2xl text-concrete border border-border">
+                <Mail size={18} />
+              </div>
+              <div className="space-y-1">
+                <h4 className="text-base font-bold text-ink">{t('settings.marketingTitle')}</h4>
+                <p className="text-[11px] text-concrete max-w-2xl leading-relaxed">
+                  {t('settings.marketingDescription')}
+                </p>
+              </div>
+            </div>
+            <label className={cn('relative inline-flex items-center shrink-0', marketingBlocked || marketingSaving ? 'opacity-60 cursor-not-allowed' : 'cursor-pointer')}>
+              <input
+                type="checkbox"
+                className="sr-only peer"
+                checked={marketingOptIn}
+                disabled={marketingBlocked || marketingSaving}
+                onChange={(e) => handleMarketingChange(e.target.checked)}
+              />
+              <div className="w-11 h-6 bg-gray-200 dark:bg-white/10 rounded-full peer peer-checked:after:translate-x-[20px] peer-checked:after:border-white after:content-[''] after:absolute after:top-[4px] after:left-[4px] after:bg-white after:rounded-full after:h-4 after:w-4 after:transition-all duration-300 ease-in-out peer-checked:bg-brand-accent" />
+            </label>
+          </div>
+          <p className="text-[12px] leading-relaxed text-ink/80">
+            {t('settings.marketingLegal')}
+          </p>
+          {marketingBlocked && (
+            <p className="text-[12px] text-rose-600">{t('settings.marketingBlocked')}</p>
+          )}
+        </div>
+
         <div
           ref={aiConsentSectionRef}
           className={cn(