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/assistant/CreateAssistantDialog.vue

@@ -18,7 +18,7 @@ const props = defineProps({
     validator: value => ['create', 'edit'].includes(value),
   },
 });
-const emit = defineEmits(['close']);
+const emit = defineEmits(['close', 'created']);
 const { t } = useI18n();
 const store = useStore();
 
@@ -35,8 +35,18 @@ const i18nKey = computed(
   () => `CAPTAIN.ASSISTANTS.${props.type.toUpperCase()}`
 );
 
-const createAssistant = assistantDetails =>
-  store.dispatch('captainAssistants/create', assistantDetails);
+const createAssistant = async assistantDetails => {
+  try {
+    const newAssistant = await store.dispatch(
+      'captainAssistants/create',
+      assistantDetails
+    );
+    emit('created', newAssistant);
+  } catch (error) {
+    const errorMessage = error?.message || t(`${i18nKey.value}.ERROR_MESSAGE`);
+    useAlert(errorMessage);
+  }
+};
 
 const handleSubmit = async updatedAssistant => {
   try {