feat: Adds the ability to resize the editor (#13916)

# Pull Request Template

## Description

This PR adds support for resizing the reply editor up to nearly half the
screen height. It also deprecates the old modal-based pop-out reply box,
clicking the same button now expands the editor inline. Users can adjust
the height using the slider or the expand button.


## Type of change

- [x] New feature (non-breaking change which adds functionality)

## How Has This Been Tested?

### Loom video
https://www.loom.com/share/be27e1c06d19475ab404289710b3b0da


## Checklist:

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [x] 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>

app/javascript/dashboard/components-next/Conversation/SidepanelSwitch.vue

@@ -57,7 +57,7 @@ useKeyboardEvents(keyboardEvents);
 
 <template>
   <ButtonGroup
-    class="flex flex-col justify-center items-center absolute top-36 xl:top-24 ltr:right-2 rtl:left-2 bg-n-solid-2/90 backdrop-blur-lg border border-n-weak/50 rounded-full gap-1.5 p-1.5 shadow-sm transition-shadow duration-200 hover:shadow"
+    class="flex flex-col justify-center items-center absolute top-36 xl:top-24 ltr:right-2 rtl:left-2 bg-n-solid-2/90 backdrop-blur-lg border border-n-weak/50 rounded-full gap-1.5 p-1.5 shadow-sm transition-shadow duration-200 hover:shadow !z-20"
   >
     <Button
       v-tooltip.top="$t('CONVERSATION.SIDEBAR.CONTACT')"