fix: enhance validation rules for agency and employer name fields

src/pages/03_customer-management/components/employer/EmployerFormAbout.vue

@@ -137,7 +137,12 @@ watch(
           @update:model-value="
             (v) => (typeof v === 'string' ? (registerName = v.trim()) : '')
           "
-          :rules="[(val: string) => !!val || $t('form.error.required')]"
+          :rules="[
+            (val) => !!val || $t('form.error.required'),
+            (val) =>
+              /^[A-Za-z0-9ก-๙\s&.,'-]+$/.test(val) ||
+              $t('form.error.branchNameField'),
+          ]"
         />
 
         <q-input
@@ -153,10 +158,10 @@ watch(
             (v) => (typeof v === 'string' ? (registerNameEN = v.trim()) : '')
           "
           :rules="[
-            (val: string) =>
-              val === '' ||
-              /^[0-9A-Za-z\s.,]+$/.test(val) ||
-              $t('form.error.letterOnly'),
+            (val) => !!val || $t('form.error.required'),
+            (val) =>
+              /^[A-Za-z0-9\s&.,'-]+$/.test(val) ||
+              $t('form.error.branchNameENField'),
           ]"
         />
       </div>