feat: allow inbox specific flags for signature toggle (#8280)

Co-authored-by: Nithin David Thomas <1277421+nithindavid@users.noreply.github.com>

app/javascript/dashboard/routes/dashboard/conversation/contact/ConversationForm.vue

@@ -281,6 +281,10 @@ export default {
       type: Function,
       default: () => {},
     },
+    channelType: {
+      type: String,
+      default: '',
+    },
   },
   data() {
     return {
@@ -316,8 +320,7 @@ export default {
       messageSignature: 'getMessageSignature',
     }),
     sendWithSignature() {
-      const { send_with_signature: isEnabled } = this.uiSettings;
-      return isEnabled;
+      return this.fetchSignatureFlagFromUiSettings(this.channelType);
     },
     signatureToApply() {
       return this.messageSignature;
@@ -543,9 +546,7 @@ export default {
       return classByType;
     },
     toggleMessageSignature() {
-      this.updateUISettings({
-        send_with_signature: !this.sendWithSignature,
-      });
+      this.setSignatureFlagForInbox(this.channelType, !this.sendWithSignature);
       this.setSignature();
     },
   },