Add optional chaining to error.response.status in catch blocks

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/stores/files.ts

@@ -155,7 +155,7 @@ export const useFilesStore = defineStore('filesStore', {
         this.$router.push({name: 'Upload'});
         Swal.close(); // 關閉進度條
       } catch(error) {
-        if(error.response.status === 422) {
+        if(error.response?.status === 422) {
           // msg: 'not in UTF-8' | 'insufficient columns' | 'the csv file is empty' | 'the filename does not ends with .csv'
           // type: 'encoding' | 'insufficient_columns' | 'empty' | 'name_suffix'
           const detail = error.response.data.detail;
@@ -199,7 +199,7 @@ export const useFilesStore = defineStore('filesStore', {
         await uploadSuccess();
         this.$router.push({name: 'Files'});
       } catch(error) {
-        if(error.response.status === 422) {
+        if(error.response?.status === 422) {
           const detail = [...error.response.data.detail];
 
           uploadFailedSecond(detail);