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/i18n/locale/en/integrations.json

@@ -341,6 +341,11 @@
   "CAPTAIN": {
     "NAME": "Captain",
     "HEADER_KNOW_MORE": "Know more",
+    "ASSISTANT_SWITCHER": {
+      "ASSISTANTS": "Assistants",
+      "SWITCH_ASSISTANT": "Switch between assistants",
+      "NEW_ASSISTANT": "Create Assistant"
+    },
     "COPILOT": {
       "TITLE": "Copilot",
       "TRY_THESE_PROMPTS": "Try these prompts",
@@ -480,9 +485,7 @@
         "NOT_FOUND": "Could not find the assistant. Please try again."
       },
       "SETTINGS": {
-        "BREADCRUMB": {
-          "ASSISTANT": "Assistant"
-        },
+        "HEADER": "Settings",
         "BASIC_SETTINGS": {
           "TITLE": "Basic settings",
           "DESCRIPTION": "Customize what the assistant says when ending a conversation or transferring to a human."
@@ -499,15 +502,16 @@
               "TITLE": "Guardrails",
               "DESCRIPTION": "Keeps things on track—only the kinds of questions you want your assistant to answer, nothing off-limits or off-topic."
             },
-            "SCENARIOS": {
-              "TITLE": "Scenarios",
-              "DESCRIPTION": "Give your assistant some context—like “what to do when a user is stuck,” or “how to act during a refund request.”"
-            },
             "RESPONSE_GUIDELINES": {
               "TITLE": "Response guidelines",
               "DESCRIPTION": "The vibe and structure of your assistant’s replies—clear and friendly? Short and snappy? Detailed and formal?"
             }
           }
+        },
+        "DELETE": {
+          "TITLE": "Delete Assistant",
+          "DESCRIPTION": "This action is permanent. Deleting this assistant will remove it from all connected inboxes and permanently erase all generated knowledge.",
+          "BUTTON_TEXT": "Delete {assistantName}"
         }
       },
       "OPTIONS": {
@@ -526,9 +530,6 @@
       "GUARDRAILS": {
         "TITLE": "Guardrails",
         "DESCRIPTION": "Keeps things on track—only the kinds of questions you want your assistant to answer, nothing off-limits or off-topic.",
-        "BREADCRUMB": {
-          "TITLE": "Guardrails"
-        },
         "BULK_ACTION": {
           "SELECTED": "{count} item selected | {count} items selected",
           "SELECT_ALL": "Select all ({count})",
@@ -574,9 +575,6 @@
       "RESPONSE_GUIDELINES": {
         "TITLE": "Response Guidelines",
         "DESCRIPTION": "The vibe and structure of your assistant’s replies—clear and friendly? Short and snappy? Detailed and formal?",
-        "BREADCRUMB": {
-          "TITLE": "Response Guidelines"
-        },
         "BULK_ACTION": {
           "SELECTED": "{count} item selected | {count} items selected",
           "SELECT_ALL": "Select all ({count})",
@@ -622,9 +620,6 @@
       "SCENARIOS": {
         "TITLE": "Scenarios",
         "DESCRIPTION": "Give your assistant some context—like “what to do when a user is stuck,” or “how to act during a refund request.”",
-        "BREADCRUMB": {
-          "TITLE": "Scenarios"
-        },
         "BULK_ACTION": {
           "SELECTED": "{count} item selected | {count} items selected",
           "SELECT_ALL": "Select all ({count})",
@@ -722,11 +717,6 @@
         "NAME": {
           "LABEL": "Document Name (Optional)",
           "PLACEHOLDER": "Enter a name for the document"
-        },
-        "ASSISTANT": {
-          "LABEL": "Assistant",
-          "PLACEHOLDER": "Select the assistant",
-          "ERROR": "The assistant field is required"
         }
       },
       "DELETE": {
@@ -921,12 +911,6 @@
           "LABEL": "Answer",
           "PLACEHOLDER": "Enter the answer here",
           "ERROR": "Please provide a valid answer."
-        },
-
-        "ASSISTANT": {
-          "LABEL": "Assistant",
-          "PLACEHOLDER": "Select an assistant",
-          "ERROR": "Please select an assistant."
         }
       },
       "EDIT": {

app/javascript/dashboard/i18n/locale/en/settings.json

@@ -305,6 +305,10 @@
     "CAPTAIN_DOCUMENTS": "Documents",
     "CAPTAIN_RESPONSES": "FAQs",
     "CAPTAIN_TOOLS": "Tools",
+    "CAPTAIN_SCENARIOS": "Scenarios",
+    "CAPTAIN_PLAYGROUND": "Playground",
+    "CAPTAIN_INBOXES": "Inboxes",
+    "CAPTAIN_SETTINGS": "Settings",
     "HOME": "Home",
     "AGENTS": "Agents",
     "AGENT_BOTS": "Bots",