More CSS work

src/menus/errors.rs

@@ -0,0 +1,11 @@
+use bevy::{ecs::query::QueryEntityError, reflect::Reflect};
+
+use crate::{fighter::FighterId, menus::match_config::MenuMatchConfigErrors};
+
+#[derive(thiserror::Error, Debug, Reflect)]
+pub enum MenuErrors {
+    #[error("Fighter manifest not found")]
+    FighterManifestNotFound,
+    #[error("Match config error: {0:?}")]
+    MatchConfigError(#[from] MenuMatchConfigErrors),
+}