refactor: move AppContext to presentation crate, structurally enforce boundary

crates/application/src/users/tests/get_settings.rs

@@ -7,7 +7,9 @@ async fn returns_default_settings() {
     let b = TestContextBuilder::new();
     let user_settings = b.user_settings_repo.clone();
 
-    let settings = get_settings::execute(user_settings, Uuid::nil()).await.unwrap();
+    let settings = get_settings::execute(user_settings, Uuid::nil())
+        .await
+        .unwrap();
 
     assert!(!settings.federate_goals());
 }

crates/application/src/users/tests/get_users.rs

@@ -8,7 +8,9 @@ async fn returns_empty_when_no_users() {
     let user = b.user_repo.clone();
     let social_query = b.social_query.clone();
 
-    let result = get_users::execute(user, social_query, GetUsersQuery).await.unwrap();
+    let result = get_users::execute(user, social_query, GetUsersQuery)
+        .await
+        .unwrap();
 
     assert!(result.users.is_empty());
     assert!(result.remote_actors.is_empty());

crates/application/src/users/tests/update_settings.rs

@@ -11,8 +11,7 @@ use crate::{
 #[tokio::test]
 async fn updates_federate_goals() {
     let settings_repo = InMemoryUserSettingsRepository::new();
-    let b = TestContextBuilder::new()
-        .with_user_settings(Arc::clone(&settings_repo) as _);
+    let b = TestContextBuilder::new().with_user_settings(Arc::clone(&settings_repo) as _);
     let user_settings = b.user_settings_repo.clone();
 
     let uid = Uuid::nil();