fix: Hide Copilot launcher on inbox view message screen (#11723)

# Pull Request Template

## Description

This PR will hide Copilot launcher button on inbox view message screen.

## Type of change

- [x] Bug fix (non-breaking change which fixes an issue)

## How Has This Been Tested?

### Screenshots

**Before**
<img width="1425" alt="image"
src="https://github.com/user-attachments/assets/319a010c-d6e0-4ac0-b52f-7a4263e62e7f"
/>

**After**
<img width="1442" alt="image"
src="https://github.com/user-attachments/assets/73ed796e-97ab-4d34-bf65-43a439d7e66b"
/>
<img width="1442" alt="image"
src="https://github.com/user-attachments/assets/98043441-7c8a-492a-abc3-330856d44c19"
/>



## 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

app/javascript/dashboard/components-next/copilot/CopilotLauncher.vue

@@ -19,6 +19,7 @@ const isConversationRoute = computed(() => {
     'conversation_through_mentions',
     'conversation_through_unattended',
     'conversation_through_participating',
+    'inbox_view_conversation',
   ];
   return CONVERSATION_ROUTES.includes(route.name);
 });