ST-cmovs8jvq: PushToggle component met 3 states + iOS-banner

Client component met states loading/unsupported/ios-needs-install/
denied/subscribed/unsubscribed. useEffect detecteert initial status,
permission-prompt alleen via user-click. iOS-banner NL, denied-uitleg,
subscribe/unsubscribe knoppen met sonner-toasts.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

components/notifications/push-toggle.tsx

@@ -0,0 +1,116 @@
+'use client'
+
+import { useEffect, useState } from 'react'
+import { toast } from 'sonner'
+import { Button } from '@/components/ui/button'
+import {
+  isPushSupported,
+  isIOSSafari,
+  isStandalonePWA,
+  subscribeToPush,
+  unsubscribeFromPush,
+} from '@/lib/push-client'
+
+type PushStatus =
+  | 'loading'
+  | 'unsupported'
+  | 'ios-needs-install'
+  | 'denied'
+  | 'subscribed'
+  | 'unsubscribed'
+
+interface PushToggleProps {
+  vapidPublicKey?: string
+}
+
+export function PushToggle({ vapidPublicKey }: PushToggleProps) {
+  const [status, setStatus] = useState<PushStatus>('loading')
+
+  useEffect(() => {
+    async function detectStatus() {
+      if (!isPushSupported()) {
+        if (isIOSSafari() && !isStandalonePWA()) {
+          setStatus('ios-needs-install')
+        } else {
+          setStatus('unsupported')
+        }
+        return
+      }
+
+      if (Notification.permission === 'denied') {
+        setStatus('denied')
+        return
+      }
+
+      try {
+        const reg = await navigator.serviceWorker.getRegistration()
+        const sub = await reg?.pushManager.getSubscription()
+        setStatus(sub ? 'subscribed' : 'unsubscribed')
+      } catch {
+        setStatus('unsubscribed')
+      }
+    }
+
+    detectStatus()
+  }, [])
+
+  async function handleSubscribe() {
+    if (!vapidPublicKey) {
+      toast.error('Push niet beschikbaar — VAPID-sleutel ontbreekt')
+      return
+    }
+    try {
+      await subscribeToPush(vapidPublicKey)
+      setStatus('subscribed')
+      toast.success('Push-notificaties geactiveerd')
+    } catch {
+      if (Notification.permission === 'denied') {
+        setStatus('denied')
+      }
+      toast.error('Kon push niet activeren. Controleer je browserinstellingen.')
+    }
+  }
+
+  async function handleUnsubscribe() {
+    try {
+      await unsubscribeFromPush()
+      setStatus('unsubscribed')
+      toast.success('Push-notificaties uitgeschakeld')
+    } catch {
+      toast.error('Kon push niet uitschakelen')
+    }
+  }
+
+  if (status === 'loading' || status === 'unsupported') return null
+
+  if (status === 'ios-needs-install') {
+    return (
+      <div className="rounded-lg bg-surface-variant p-3 text-sm text-on-surface-variant">
+        Op iPhone/iPad: tik op het delen-icoon en kies{' '}
+        <strong>Zet op beginscherm</strong>. Daarna kun je notificaties activeren.
+      </div>
+    )
+  }
+
+  if (status === 'denied') {
+    return (
+      <p className="text-sm text-on-surface-variant">
+        Notificaties zijn geblokkeerd. Schakel ze in via je browser-instellingen.
+      </p>
+    )
+  }
+
+  if (status === 'unsubscribed') {
+    return (
+      <Button variant="default" size="sm" onClick={handleSubscribe}>
+        Activeer push
+      </Button>
+    )
+  }
+
+  return (
+    <Button variant="outline" size="sm" onClick={handleUnsubscribe}>
+      Push uitzetten
+    </Button>
+  )
+}