feat(pushd): Guard against malformed vapid web pushes.

crates/daemons/pushd/src/consumers/outbound/vapid.rs

@@ -55,11 +55,24 @@ impl AsyncConsumer for VapidOutboundConsumer {
 
         let config = revolt_config::config().await;
 
+        // A VAPID web push payload must carry the subscription endpoint and the
+        // p256dh public key in `extras`. Dropped malformed requests instead
+        // of panicking.
+        let (Some(endpoint), Some(p256dh)) =
+            (payload.extras.get("endpoint"), payload.extras.get("p256dh"))
+        else {
+            log::warn!(
+                "Dropping VAPID push for session {}: payload missing endpoint/p256dh in extras.",
+                payload.session_id
+            );
+            return;
+        };
+
         let subscription = SubscriptionInfo {
-            endpoint: payload.extras.get("endpoint").unwrap().clone(),
+            endpoint: endpoint.clone(),
             keys: SubscriptionKeys {
                 auth: payload.token,
-                p256dh: payload.extras.get("p256dh").unwrap().clone(),
+                p256dh: p256dh.clone(),
             },
         };