feat: Standardize rich editor across all channels (#12600)

# Pull Request Template

## Description

This PR includes,

1. **Channel-specific formatting and menu options** for the rich reply
editor.
2. **Removal of the plain reply editor** and full **standardization** on
the rich reply editor across all channels.
3. **Fix for multiple canned responses insertion:**
* **Before:** The plain editor only allowed inserting canned responses
at the beginning of a message, making it impossible to combine multiple
canned responses in a single reply. This caused inconsistent behavior
across the app.
* **Solution:** Replaced the plain reply editor with the rich
(ProseMirror) editor to ensure a unified experience. Agents can now
insert multiple canned responses at any cursor position.
4. **Floating editor menu** for the reply box to improve accessibility
and overall user experience.
5. **New Strikethrough formatting option** added to the editor menu.

---

**Editor repo PR**:
https://github.com/chatwoot/prosemirror-schema/pull/36

Fixes https://github.com/chatwoot/chatwoot/issues/12517,
[CW-5924](https://linear.app/chatwoot/issue/CW-5924/standardize-the-editor),
[CW-5679](https://linear.app/chatwoot/issue/CW-5679/allow-inserting-multiple-canned-responses-in-a-single-message)

## Type of change

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

## How Has This Been Tested?

### Screenshot
**Dark**
<img width="850" height="345" alt="image"
src="https://github.com/user-attachments/assets/47748e6c-380f-44a3-9e3b-c27e0c830bd0"
/>

**Light**
<img width="850" height="345" alt="image"
src="https://github.com/user-attachments/assets/6746cf32-bf63-4280-a5bd-bbd42c3cbe84"
/>


## 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
- [x] 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: Muhsin Keloth <muhsinkeramam@gmail.com>
Co-authored-by: Pranav <pranav@chatwoot.com>
Co-authored-by: Vinay Keerthi <11478411+stonecharioteer@users.noreply.github.com>

app/javascript/dashboard/routes/dashboard/settings/inbox/Settings.vue

@@ -27,7 +27,6 @@ import { FEATURE_FLAGS } from '../../../../featureFlags';
 import SenderNameExamplePreview from './components/SenderNameExamplePreview.vue';
 import NextButton from 'dashboard/components-next/button/Button.vue';
 import { INBOX_TYPES } from 'dashboard/helper/inbox';
-import { WIDGET_BUILDER_EDITOR_MENU_OPTIONS } from 'dashboard/constants/editor';
 import { getInboxIconByType } from 'dashboard/helper/inbox';
 import Editor from 'dashboard/components-next/Editor/Editor.vue';
 
@@ -81,7 +80,6 @@ export default {
       selectedTabIndex: 0,
       selectedPortalSlug: '',
       showBusinessNameInput: false,
-      welcomeTaglineEditorMenuOptions: WIDGET_BUILDER_EDITOR_MENU_OPTIONS,
       healthData: null,
       isLoadingHealth: false,
       healthError: null,
@@ -626,7 +624,7 @@ export default {
               )
             "
             :max-length="255"
-            :enabled-menu-options="welcomeTaglineEditorMenuOptions"
+            channel-type="Context::InboxSettings"
           />
 
           <label v-if="isAWebWidgetInbox" class="pb-4">

app/javascript/dashboard/routes/dashboard/settings/inbox/WidgetBuilder.vue

@@ -7,7 +7,6 @@ import { useVuelidate } from '@vuelidate/core';
 import { required } from '@vuelidate/validators';
 import { LOCAL_STORAGE_KEYS } from 'dashboard/constants/localStorage';
 import { LocalStorage } from 'shared/helpers/localStorage';
-import { WIDGET_BUILDER_EDITOR_MENU_OPTIONS } from 'dashboard/constants/editor';
 import NextButton from 'dashboard/components-next/button/Button.vue';
 import Avatar from 'next/avatar/Avatar.vue';
 import Editor from 'dashboard/components-next/Editor/Editor.vue';
@@ -76,7 +75,6 @@ export default {
           checked: false,
         },
       ],
-      welcomeTaglineEditorMenuOptions: WIDGET_BUILDER_EDITOR_MENU_OPTIONS,
     };
   },
   computed: {
@@ -337,7 +335,7 @@ export default {
                 )
               "
               :max-length="255"
-              :enabled-menu-options="welcomeTaglineEditorMenuOptions"
+              channel-type="Context::InboxSettings"
               class="mb-4"
             />
             <label>

app/javascript/dashboard/routes/dashboard/settings/inbox/channels/Website.vue

@@ -5,7 +5,6 @@ import router from '../../../../index';
 import NextButton from 'dashboard/components-next/button/Button.vue';
 import PageHeader from '../../SettingsSubPageHeader.vue';
 import GreetingsEditor from 'shared/components/GreetingsEditor.vue';
-import { WIDGET_BUILDER_EDITOR_MENU_OPTIONS } from 'dashboard/constants/editor';
 import Editor from 'dashboard/components-next/Editor/Editor.vue';
 
 export default {
@@ -24,7 +23,6 @@ export default {
       channelWelcomeTagline: '',
       greetingEnabled: false,
       greetingMessage: '',
-      welcomeTaglineEditorMenuOptions: WIDGET_BUILDER_EDITOR_MENU_OPTIONS,
     };
   },
   computed: {
@@ -147,7 +145,7 @@ export default {
           )
         "
         :max-length="255"
-        :enabled-menu-options="welcomeTaglineEditorMenuOptions"
+        channel-type="Context::InboxSettings"
         class="mb-4"
       />
 

app/javascript/dashboard/routes/dashboard/settings/profile/MessageSignature.vue

@@ -1,7 +1,6 @@
 <script setup>
 import { ref, watch } from 'vue';
 import WootMessageEditor from 'dashboard/components/widgets/WootWriter/Editor.vue';
-import { MESSAGE_SIGNATURE_EDITOR_MENU_OPTIONS } from 'dashboard/constants/editor';
 import NextButton from 'dashboard/components-next/button/Button.vue';
 
 const props = defineProps({
@@ -12,7 +11,6 @@ const props = defineProps({
 });
 
 const emit = defineEmits(['updateSignature']);
-const customEditorMenuList = MESSAGE_SIGNATURE_EDITOR_MENU_OPTIONS;
 const signature = ref(props.messageSignature);
 watch(
   () => props.messageSignature ?? '',
@@ -34,7 +32,7 @@ const updateSignature = () => {
       class="message-editor h-[10rem] !px-3"
       is-format-mode
       :placeholder="$t('PROFILE_SETTINGS.FORM.MESSAGE_SIGNATURE.PLACEHOLDER')"
-      :enabled-menu-options="customEditorMenuList"
+      channel-type="Context::MessageSignature"
       :enable-suggestions="false"
       show-image-resize-toolbar
     />