fix: RTL issues in new conversation form (#12163)

# Pull Request Template

## Description

This PR fixes RTL alignment issues in the new conversation form, removes
the unused
[`form-checkbox`](https://github.com/chatwoot/chatwoot/pull/12151#discussion_r2266333315)
class name and drops the `app-rtl--wrapper` class, which was previously
used for RTL detection in `rtl.scss` (removed earlier)

Fixes https://linear.app/chatwoot/issue/CW-5410/rtl-issues

## Type of change

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

## How Has This Been Tested?

### Screenshots

<img width="868" height="474" alt="image"
src="https://github.com/user-attachments/assets/45995652-2895-49d5-a651-179090c949ec"
/>
<img width="868" height="656" alt="image"
src="https://github.com/user-attachments/assets/a1cb4415-3fd4-4c9a-bc46-5e07e437d757"
/>
<img width="868" height="656" alt="image"
src="https://github.com/user-attachments/assets/77c8981f-364e-4bf0-bea8-a4c42a76d065"
/>



## 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/captain/pageComponents/assistant/EditAssistantForm.vue

@@ -303,26 +303,17 @@ watch(
               <input
                 v-model="state.features.conversationFaqs"
                 type="checkbox"
-                class="form-checkbox"
               />
               {{
                 t('CAPTAIN.ASSISTANTS.FORM.FEATURES.ALLOW_CONVERSATION_FAQS')
               }}
             </label>
             <label class="flex items-center gap-2">
-              <input
-                v-model="state.features.memories"
-                type="checkbox"
-                class="form-checkbox"
-              />
+              <input v-model="state.features.memories" type="checkbox" />
               {{ t('CAPTAIN.ASSISTANTS.FORM.FEATURES.ALLOW_MEMORIES') }}
             </label>
             <label class="flex items-center gap-2">
-              <input
-                v-model="state.features.citations"
-                type="checkbox"
-                class="form-checkbox"
-              />
+              <input v-model="state.features.citations" type="checkbox" />
               {{ t('CAPTAIN.ASSISTANTS.FORM.FEATURES.ALLOW_CITATIONS') }}
             </label>
           </div>