feat: Add a read indicator for web-widget channel (#4224)

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

app/javascript/dashboard/store/modules/specs/conversations/mutations.spec.js

@@ -187,6 +187,18 @@ describe('#mutations', () => {
       ]);
     });
 
+    describe('#SET_CONVERSATION_LAST_SEEN', () => {
+      it('sets conversation last seen timestamp', () => {
+        const state = {
+          conversationLastSeen: null,
+        };
+
+        mutations[types.SET_CONVERSATION_LAST_SEEN](state, 1649856659);
+
+        expect(state.conversationLastSeen).toEqual(1649856659);
+      });
+    });
+
     describe('#UPDATE_CONVERSATION_CUSTOM_ATTRIBUTES', () => {
       it('update conversation custom attributes', () => {
         const custom_attributes = { order_id: 1001 };