feat: Use vue-router on widget route management (#3415)

* feat: Add vue-router to widget

Co-authored-by: Pranav <pranav@chatwoot.com>

* Move to dynamic imports

* Move to routerMixin

* Fix popup button display

* Remove unnecessary import

* router -> route

* Fix open state

* Fix issues

* Remove used CSS

* Fix specs

* Fix specs

* Fix widgetColor specs

* Fix mutation specs

* Fixes broken lint errors

* Fixes issues with widget flow

Co-authored-by: Nithin <nithin@chatwoot.com>
Co-authored-by: Nithin David <1277421+nithindavid@users.noreply.github.com>
Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>

app/javascript/widget/i18n/locale/en.json

@@ -22,6 +22,7 @@
     "IN_A_DAY": "Typically replies in a day"
   },
   "START_CONVERSATION": "Start Conversation",
+  "CONTINUE_CONVERSATION": "Continue conversation",
   "START_NEW_CONVERSATION": "Start a new conversation",
   "UNREAD_VIEW": {
     "VIEW_MESSAGES_BUTTON": "See new messages",