fix(ap): add url field to Note, handle Delete(actor) and Tombstone objects

crates/adapters/activitypub/src/note.rs

@@ -11,6 +11,7 @@ pub struct ThoughtNote {
     #[serde(rename = "type")]
     pub kind: NoteType,
     pub id: Url,
+    pub url: Url, // Mastodon uses this as the clickable link
     pub attributed_to: Url,
     pub content: String,
     pub published: DateTime<Utc>,
@@ -39,6 +40,7 @@ impl ThoughtNote {
     ) -> Self {
         Self {
             kind: Default::default(),
+            url: id.clone(),
             id,
             attributed_to: actor_url,
             content,
@@ -71,5 +73,6 @@ mod tests {
         let json = serde_json::to_string(&note).unwrap();
         assert!(json.contains(AS_PUBLIC));
         assert!(json.contains("Hello world"));
+        assert!(json.contains("\"url\""));
     }
 }