feat: add FE changes for captain pdf support for faq generation (#12115)

Linked PR
https://github.com/chatwoot/chatwoot/pull/12113

## Linear Link
https://linear.app/chatwoot/issue/CW-4515/upload-pdfs-to-captain

## Description

This PR adds support for PDF file uploads to the Captain document
knowledge base system. The feature enables users to upload PDF files
directly to the knowledge base for FAQ generation and document
processing, expanding beyond the existing URL-based document ingestion.

## Type of change

- [ ] New feature (non-breaking change which adds functionality)

## How Has This Been Tested?

- Unit Tests
- Manually via UI



## Checklist:

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [x] I have commented on my code, particularly in hard-to-understand
areas
- [x] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [x] I have added tests that prove my fix is effective or that my
feature works
- [x] New and existing unit tests pass locally with my changes
- [x] Any dependent changes have been merged and published in downstream
modules

---------

Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>
Co-authored-by: iamsivin <iamsivin@gmail.com>

app/javascript/dashboard/components-next/captain/pageComponents/document/CreateDocumentDialog.vue

@@ -3,6 +3,7 @@ import { ref } from 'vue';
 import { useStore } from 'dashboard/composables/store';
 import { useAlert } from 'dashboard/composables';
 import { useI18n } from 'vue-i18n';
+import { parseAPIErrorResponse } from 'dashboard/store/utils/api';
 
 import Dialog from 'dashboard/components-next/dialog/Dialog.vue';
 import DocumentForm from './DocumentForm.vue';
@@ -12,7 +13,6 @@ const { t } = useI18n();
 const store = useStore();
 
 const dialogRef = ref(null);
-const documentForm = ref(null);
 
 const i18nKey = 'CAPTAIN.DOCUMENTS.CREATE';
 
@@ -23,7 +23,7 @@ const handleSubmit = async newDocument => {
     dialogRef.value.close();
   } catch (error) {
     const errorMessage =
-      error?.response?.message || t(`${i18nKey}.ERROR_MESSAGE`);
+      parseAPIErrorResponse(error) || t(`${i18nKey}.ERROR_MESSAGE`);
     useAlert(errorMessage);
   }
 };
@@ -48,11 +48,7 @@ defineExpose({ dialogRef });
     :show-confirm-button="false"
     @close="handleClose"
   >
-    <DocumentForm
-      ref="documentForm"
-      @submit="handleSubmit"
-      @cancel="handleCancel"
-    />
+    <DocumentForm @submit="handleSubmit" @cancel="handleCancel" />
     <template #footer />
   </Dialog>
 </template>