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/store/captain/storeFactory.spec.js

@@ -175,7 +175,7 @@ describe('storeFactory', () => {
         expect(commit).toHaveBeenCalledWith(mutationTypes.SET_UI_FLAG, {
           fetchingItem: true,
         });
-        expect(commit).toHaveBeenCalledWith(mutationTypes.ADD, data);
+        expect(commit).toHaveBeenCalledWith(mutationTypes.UPSERT, data);
         expect(commit).toHaveBeenCalledWith(mutationTypes.SET_UI_FLAG, {
           fetchingItem: false,
         });

app/javascript/dashboard/store/captain/storeFactoryHelper.js

@@ -22,7 +22,7 @@ export const showRecord =
     commit(mutationTypes.SET_UI_FLAG, { fetchingItem: true });
     try {
       const response = await API.show(id);
-      commit(mutationTypes.ADD, response.data);
+      commit(mutationTypes.UPSERT, response.data);
       return response.data;
     } catch (error) {
       return throwErrorMessage(error);