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/response/ResponseForm.vue

@@ -8,7 +8,6 @@ import { useMapGetter } from 'dashboard/composables/store';
 import Input from 'dashboard/components-next/input/Input.vue';
 import Editor from 'dashboard/components-next/Editor/Editor.vue';
 import Button from 'dashboard/components-next/button/Button.vue';
-import ComboBox from 'dashboard/components-next/combobox/ComboBox.vue';
 
 const props = defineProps({
   mode: {
@@ -21,18 +20,17 @@ const props = defineProps({
     default: () => ({}),
   },
 });
+
 const emit = defineEmits(['submit', 'cancel']);
 const { t } = useI18n();
 
 const formState = {
   uiFlags: useMapGetter('captainResponses/getUIFlags'),
-  assistants: useMapGetter('captainAssistants/getRecords'),
 };
 
 const initialState = {
   question: '',
   answer: '',
-  assistantId: null,
 };
 
 const state = reactive({ ...initialState });
@@ -40,16 +38,8 @@ const state = reactive({ ...initialState });
 const validationRules = {
   question: { required, minLength: minLength(1) },
   answer: { required, minLength: minLength(1) },
-  assistantId: { required },
 };
 
-const assistantList = computed(() =>
-  formState.assistants.value.map(assistant => ({
-    value: assistant.id,
-    label: assistant.name,
-  }))
-);
-
 const v$ = useVuelidate(validationRules, state);
 
 const isLoading = computed(() => formState.uiFlags.value.creatingItem);
@@ -63,7 +53,6 @@ const getErrorMessage = (field, errorKey) => {
 const formErrors = computed(() => ({
   question: getErrorMessage('question', 'QUESTION'),
   answer: getErrorMessage('answer', 'ANSWER'),
-  assistantId: getErrorMessage('assistantId', 'ASSISTANT'),
 }));
 
 const handleCancel = () => emit('cancel');
@@ -71,7 +60,6 @@ const handleCancel = () => emit('cancel');
 const prepareDocumentDetails = () => ({
   question: state.question,
   answer: state.answer,
-  assistant_id: state.assistantId,
 });
 
 const handleSubmit = async () => {
@@ -86,12 +74,11 @@ const handleSubmit = async () => {
 const updateStateFromResponse = response => {
   if (!response) return;
 
-  const { question, answer, assistant } = response;
+  const { question, answer } = response;
 
   Object.assign(state, {
     question,
     answer,
-    assistantId: assistant.id,
   });
 };
 
@@ -115,7 +102,6 @@ watch(
       :message="formErrors.question"
       :message-type="formErrors.question ? 'error' : 'info'"
     />
-
     <Editor
       v-model="state.answer"
       :label="t('CAPTAIN.RESPONSES.FORM.ANSWER.LABEL')"
@@ -124,22 +110,6 @@ watch(
       :max-length="10000"
       :message-type="formErrors.answer ? 'error' : 'info'"
     />
-
-    <div class="flex flex-col gap-1">
-      <label for="assistant" class="mb-0.5 text-sm font-medium text-n-slate-12">
-        {{ t('CAPTAIN.RESPONSES.FORM.ASSISTANT.LABEL') }}
-      </label>
-      <ComboBox
-        id="assistant"
-        v-model="state.assistantId"
-        :options="assistantList"
-        :has-error="!!formErrors.assistantId"
-        :placeholder="t('CAPTAIN.RESPONSES.FORM.ASSISTANT.PLACEHOLDER')"
-        class="[&>div>button]:bg-n-alpha-black2 [&>div>button:not(.focused)]:dark:outline-n-weak [&>div>button:not(.focused)]:hover:!outline-n-slate-6"
-        :message="formErrors.assistantId"
-      />
-    </div>
-
     <div class="flex items-center justify-between w-full gap-3">
       <Button
         type="button"