feat: MovieDto enrichment, movie detail page, PWA, watchlist, watchlist federation

crates/adapters/activitypub/src/urls.rs

@@ -12,3 +12,9 @@ pub fn review_url(base_url: &str, review_id: &ReviewId) -> Url {
     Url::parse(&format!("{}/reviews/{}", base_url, review_id.value()))
         .expect("base_url is always a valid URL prefix")
 }
+
+/// Builds the canonical watchlist entry URL: `{base_url}/users/{user_id}/watchlist/{movie_id}`
+pub fn watchlist_entry_url(base_url: &str, user_id: uuid::Uuid, movie_id: uuid::Uuid) -> Url {
+    Url::parse(&format!("{}/users/{}/watchlist/{}", base_url, user_id, movie_id))
+        .expect("base_url is always a valid URL prefix")
+}