fix: broadcast AP Update after poster sync to fix missing posters on remote instances

New movies had no poster at AP broadcast time (race between poster sync
and ReviewLogged handler). PosterSynced event now fires after sync
completes, triggering Update notes so remote apps get the poster URL.

crates/adapters/activitypub/src/event_handler.rs

@@ -4,7 +4,7 @@ use domain::{
     errors::DomainError,
     events::DomainEvent,
     ports::LocalApContentQuery,
-    value_objects::{ReviewId, UserId},
+    value_objects::{MovieId, ReviewId, UserId},
 };
 use std::sync::Arc;
 
@@ -97,6 +97,10 @@ impl EventHandler for ActivityPubEventHandler {
                     .await
                     .map_err(|e| DomainError::InfrastructureError(e.to_string()))
             }
+            DomainEvent::PosterSynced { movie_id } => self
+                .on_poster_synced(movie_id)
+                .await
+                .map_err(|e| DomainError::InfrastructureError(e.to_string())),
             _ => Ok(()),
         }
     }
@@ -267,4 +271,44 @@ impl ActivityPubEventHandler {
             .await?;
         Ok(())
     }
+
+    async fn on_poster_synced(&self, movie_id: &MovieId) -> anyhow::Result<()> {
+        let entries = self
+            .content_query
+            .get_local_reviews_for_movie(movie_id)
+            .await?;
+
+        let movie = self.content_query.get_movie_by_id(movie_id).await?;
+        let movie = match movie {
+            Some(m) => m,
+            None => return Ok(()),
+        };
+        let poster_url = movie
+            .poster_path()
+            .map(|p| format!("{}/images/{}", self.base_url, p.value()));
+
+        for entry in entries {
+            let review = entry.review();
+            let user_id = review.user_id();
+            let ap_id = review_url(&self.base_url, review.id());
+            let actor = actor_url(&self.base_url, user_id.value());
+
+            let obj = review_to_ap_object(
+                review,
+                ap_id,
+                actor,
+                movie.title().value().to_string(),
+                movie.release_year().value(),
+                poster_url.clone(),
+                &self.base_url,
+            );
+            let json = serde_json::to_value(obj)?;
+
+            self.ap_service
+                .broadcast_update_note(user_id.value(), json, ApVisibility::Public, vec![])
+                .await?;
+        }
+
+        Ok(())
+    }
 }