Return a 404 when paring the route fails (#3860)

* return a 404 when paring the route fails

* add a playwright test for fullstack routing status codes

* Fix new playwright test

* document SSRError

* Make SSRError public and fix clippy

* Move the error display bound to the routable trait

* fix clippy

* return a more generic 404 message

* fix router tests

packages/isrg/src/lib.rs

@@ -156,7 +156,7 @@ pub enum IncrementalRendererError {
     /// An IO error occurred while rendering a route.
     #[error("IoError: {0}")]
     IoError(#[from] std::io::Error),
-    /// An IO error occurred while rendering a route.
+    /// An error occurred while rendering a route.
     #[error("Other: {0}")]
     Other(#[from] Box<dyn std::error::Error + Send + Sync>),
 }