feat: Update Captain navigation structure (#12761)

# Pull Request Template

## Description

This PR includes an update to the Captain navigation structure.

## Route Structure

```javascript
1. captain_assistants_responses_index    → /captain/:assistantId/faqs
2. captain_assistants_documents_index    → /captain/:assistantId/documents
3. captain_assistants_scenarios_index    → /captain/:assistantId/scenarios
4. captain_assistants_playground_index   → /captain/:assistantId/playground
5. captain_assistants_inboxes_index      → /captain/:assistantId/inboxes
6. captain_tools_index                   → /captain/tools
7. captain_assistants_settings_index     → /captain/:assistantId/settings
8. captain_assistants_guardrails_index   → /captain/:assistantId/settings/guardrails
9. captain_assistants_guidelines_index   → /captain/:assistantId/settings/guidelines
10. captain_assistants_index             → /captain/:navigationPath
```

**How it works:**

1. User clicks sidebar item → Routes to `captain_assistants_index` with
`navigationPath`
2. `AssistantsIndexPage` validates route and gets last active assistant,
if not redirects to assistant create page.
3. Routes to actual page: `/captain/:assistantId/:page`
4. Page loads with correct assistant context

Fixes
https://linear.app/chatwoot/issue/CW-5832/updating-captain-navigation

## Type of change

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

## How Has This Been Tested?




## Checklist:

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [ ] I have commented on my code, particularly in hard-to-understand
areas
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [ ] 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
- [ ] Any dependent changes have been merged and published in downstream
modules

---------

Co-authored-by: Pranav <pranav@chatwoot.com>
Co-authored-by: Sojan Jose <sojan@pepalo.com>

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

@@ -8,6 +8,13 @@ import { parseAPIErrorResponse } from 'dashboard/store/utils/api';
 import Dialog from 'dashboard/components-next/dialog/Dialog.vue';
 import DocumentForm from './DocumentForm.vue';
 
+defineProps({
+  assistantId: {
+    type: Number,
+    required: true,
+  },
+});
+
 const emit = defineEmits(['close']);
 const { t } = useI18n();
 const store = useStore();
@@ -48,7 +55,11 @@ defineExpose({ dialogRef });
     :show-confirm-button="false"
     @close="handleClose"
   >
-    <DocumentForm @submit="handleSubmit" @cancel="handleCancel" />
+    <DocumentForm
+      :assistant-id="assistantId"
+      @submit="handleSubmit"
+      @cancel="handleCancel"
+    />
     <template #footer />
   </Dialog>
 </template>