refactor(error): move error types to centralized location

Consolidate XError, XErrors, and FormErrors types into a single file for better maintainability and consistency across the codebase.

app/composables/useXfetch.ts

@@ -1,13 +1,5 @@
 import type { Pinia } from 'pinia'
-
-export interface XError {
-  code: string
-  message: string
-  expectedVal?: string
-  givenVal?: string
-}
-
-export type XErrors = Record<string, XError>
+import type { XError, XErrors } from '~/types/error'
 
 export interface XfetchResult {
   success: boolean