test: move application tests to tests/

test_support/test_helpers -> tests/support; watched_at unified w/ domain test_watched_at (2024-03-15).
Kept inline: users::diary_filter tests (feed_sort_to_direction_all_variants, paged_user_filter_builds_correctly) - pub(super) helpers in private module.
Dropped stale never-compiled users/tests/get_users.rs (old execute signature).

crates/application/tests/users/get_profile_settings_test.rs

@@ -0,0 +1,55 @@
+use crate::support::register_command;
+use domain::models::ProfileField;
+use domain::value_objects::{Email, UserId};
+
+use crate::support::TestContextBuilder;
+use application::auth::deps::RegisterDeps;
+use application::auth::register;
+use application::users::deps::GetProfileSettingsDeps;
+use application::users::get_profile_settings;
+
+#[tokio::test]
+async fn get_profile_settings_includes_profile_fields() {
+    let b = TestContextBuilder::new();
+    let register_deps = RegisterDeps {
+        user: b.user_repo.clone(),
+        password_hasher: b.password_hasher.clone(),
+        config: b.config.clone(),
+    };
+    register::execute(
+        &register_deps,
+        register_command("settings@test.com", "settingsuser"),
+    )
+    .await
+    .unwrap();
+    let user = b
+        .user_repo
+        .find_by_email(&Email::new("settings@test.com".into()).unwrap())
+        .await
+        .unwrap()
+        .unwrap();
+    let uid = user.id().value();
+
+    b.profile_fields_repo
+        .set_fields(
+            &UserId::from_uuid(uid),
+            vec![ProfileField {
+                name: "pronouns".into(),
+                value: "they/them".into(),
+            }],
+        )
+        .await
+        .unwrap();
+
+    let deps = GetProfileSettingsDeps {
+        user: b.user_repo.clone(),
+        profile_fields: b.profile_fields_repo.clone(),
+        instance: domain::value_objects::InstanceIdentity::new(b.config.base_url.clone()),
+    };
+
+    let s = get_profile_settings::execute(&deps, uid).await.unwrap();
+    assert_eq!(
+        s.fields,
+        vec![("pronouns".to_string(), "they/them".to_string())]
+    );
+}