i18n front : facettes localisées + Web Push (SW push, abonnement, toggle profil)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/composables/usePush.ts

@@ -0,0 +1,52 @@
+/**
+ * Abonnement Web Push. Le front ne fait que : demander la permission, s'abonner (clé VAPID du back),
+ * transmettre la subscription au back. Le back décide quand/quoi envoyer.
+ */
+function urlB64ToUint8Array(base64String: string): Uint8Array {
+  const padding = '='.repeat((4 - (base64String.length % 4)) % 4)
+  const base64 = (base64String + padding).replace(/-/g, '+').replace(/_/g, '/')
+  const raw = atob(base64)
+  const arr = new Uint8Array(raw.length)
+  for (let i = 0; i < raw.length; i++) arr[i] = raw.charCodeAt(i)
+  return arr
+}
+
+export function usePush() {
+  const { api } = useApi()
+
+  function isSupported(): boolean {
+    return import.meta.client && 'serviceWorker' in navigator && 'PushManager' in window && 'Notification' in window
+  }
+
+  async function enable(vapidPublicKey: string) {
+    if (!isSupported()) throw new Error('Notifications non supportées sur cet appareil.')
+    const perm = await Notification.requestPermission()
+    if (perm !== 'granted') throw new Error('Permission refusée.')
+
+    const reg = await navigator.serviceWorker.ready
+    const existing = await reg.pushManager.getSubscription()
+    const sub = existing ?? await reg.pushManager.subscribe({
+      userVisibleOnly: true,
+      applicationServerKey: urlB64ToUint8Array(vapidPublicKey)
+    })
+
+    const json = sub.toJSON() as { endpoint?: string, keys?: { p256dh: string, auth: string } }
+    await api('/api/push/subscribe', { method: 'POST', body: { endpoint: json.endpoint, keys: json.keys } })
+  }
+
+  async function disable() {
+    if (!isSupported()) return
+    const reg = await navigator.serviceWorker.ready
+    const sub = await reg.pushManager.getSubscription()
+    if (sub) {
+      await api('/api/push/unsubscribe', { method: 'POST', body: { endpoint: sub.endpoint } }).catch(() => {})
+      await sub.unsubscribe()
+    }
+  }
+
+  async function sendTest() {
+    await api('/api/push/test', { method: 'POST' })
+  }
+
+  return { isSupported, enable, disable, sendTest }
+}