'Genericise' errors ready for +error.svelte upgrade to handle known errors

src/hooks.client.ts

@@ -1,11 +1,11 @@
-import type { HandleClientError } from "@sveltejs/kit";
+import type { HandleClientError } from '@sveltejs/kit';
 
 export const handleError: HandleClientError = ({ error }) => {
-    const err = error as any;
+	const err = error as any;
 
-    return {
-        message: err?.message || 'An unexpected application error occurred.',
-        code: err?.code || 'CRITICAL',
-        msg: err?.msg || 'UNHANDLED_EXCEPTION'
-    };
-};
+	return {
+		message: err?.message || 'An unexpected application error occurred.',
+		code: err?.code || 'CRITICAL',
+		name: err?.name || 'UNHANDLED_EXCEPTION'
+	};
+};