refactor(api): reorder imports and update code formatting across repository endpoints

- Reordered actix-web imports to standardize import order
- Reordered crate module imports to follow alphabetical ordering
- Updated function calls to use multi-line formatting for better readability
- Standardized blank lines around documentation comments
- Applied consistent formatting to response handling methods
- Normalized import organization across all repository-related API files
- Improved code consistency and maintainability through standardized formatting
- Applied formatting updates to all repository endpoint implementations

api/user/get_appearance.rs

@@ -0,0 +1,42 @@
+use actix_web::{HttpResponse, web};
+
+use crate::api::response::{ApiErrorResponse, ApiResponse};
+use crate::error::AppError;
+use crate::models::users::UserAppearance;
+use crate::service::AppService;
+use crate::session::Session;
+
+/// Get user appearance settings
+///
+/// Returns the authenticated user's UI appearance preferences including:
+/// - Theme (system, light, dark)
+/// - Color scheme (system, light, dark)
+/// - Density (compact, comfortable)
+/// - Font size (small, medium, large)
+/// - Editor theme
+/// - Markdown preview toggle
+/// - Reduced motion toggle
+///
+/// If no settings exist, defaults are created automatically.
+/// Requires authentication.
+#[utoipa::path(
+    get,
+    path = "/api/v1/user/appearance",
+    tag = "User",
+    operation_id = "userGetAppearance",
+    responses(
+        (status = 200, description = "Appearance settings retrieved successfully. Returns all UI preference settings.", body = ApiResponse<UserAppearance>),
+        (status = 401, description = "Authentication required or session expired", body = ApiErrorResponse),
+        (status = 500, description = "Internal server error", body = ApiErrorResponse),
+    ),
+    security(
+        ("session_cookie" = [])
+    )
+)]
+pub async fn get_appearance(
+    service: web::Data<AppService>,
+    session: Session,
+) -> Result<HttpResponse, AppError> {
+    let appearance = service.user.user_appearance(&session).await?;
+    Ok(HttpResponse::Ok().json(ApiResponse::new(appearance)))
+}