refactor: simplified preload error handling

BREAKING CHANGE: removed `FetchError::PreloadNotFound`

Author: arctic-hen7

packages/perseus/src/errors.rs

@@ -369,9 +369,6 @@ pub enum FetchError {
         source: Box<dyn std::error::Error + Send + Sync>,
         ty: AssetType,
     },
-    // This is not used by the `fetch` function, but it is used by the preloading system
-    #[error("preload asset fetched from '{url}' was not found")]
-    PreloadNotFound { url: String, ty: AssetType },
     /// This converts from a `JsValue` or the like.
     #[error("the following error occurred while interfacing with JavaScript: {0}")]
     Js(String),

packages/perseus/src/state/state_store.rs

@@ -303,7 +303,7 @@ impl PageStateStore {
         is_widget: bool,
     ) -> Result<(), crate::errors::ClientError> {
         use crate::{
-            errors::{AssetType, FetchError},
+            errors::{AssetType, ClientPreloadError, FetchError},
             utils::{fetch, get_path_prefix_client},
         };
 
@@ -360,9 +360,8 @@ impl PageStateStore {
                 preloaded.insert(full_path, page_data);
                 Ok(())
             }
-            None => Err(FetchError::PreloadNotFound {
-                url: path.to_string(),
-                ty: asset_ty,
+            None => Err(ClientPreloadError::PreloadNotFound {
+                path: path.to_string(),
             }
             .into()),
         }