chore: Auto-focus editor when replying to a message (#13857)

# Pull Request Template

## Description

This PR adds support to auto-focus the editor when clicking reply to
this message, the editor now automatically receives focus so users can
start typing immediately.

Fixes
https://linear.app/chatwoot/issue/CW-6661/typing-box-not-focused-after-clicking-reply-to-message

## Type of change


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

## How Has This Been Tested?

### Screencast


https://github.com/user-attachments/assets/c5e77055-3f68-4ad8-934e-cfc465166e8a




## 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/widgets/WootWriter/Editor.vue

@@ -828,6 +828,8 @@ onMounted(() => {
   }
 });
 
+defineExpose({ focusEditorInputField });
+
 // BUS Event to insert text or markdown into the editor at the
 // current cursor position.
 // Components using this