feat(unit): add unit management pages and form components

- Create new unit list and add pages under org-src feature
- Implement unit entry form with validation using zod
- Update error types to support readonly path property
- Refactor field component to use shared error type

app/types/error.ts

@@ -11,7 +11,7 @@ export interface XError {
   /** Nilai yang diberikan (untuk validasi) */
   givenVal?: string
   /** Path field yang error (untuk form validation) */
-  path?: (string | number)[]
+  path?: readonly (string | number)[]
   /** Properties tambahan lainnya */
   [key: string]: any
 }