HH-569: guard replayed frontend realtime messages (#144)

* fix(HH-569): guard replayed realtime messages

* fix(HH-569): gate dashboard message side effects

---------

Co-authored-by: Rogee <rogee@ipao.vip>

frontend/app/javascript/dashboard/store/modules/specs/conversations/actions.spec.js

@@ -278,7 +278,11 @@ describe('#actions', () => {
 				message_type: 0,
 				conversation_id: 1,
 			};
-			actions.addMessage({ commit }, message);
+			const state = {
+				allConversations: [{ id: 1, messages: [] }],
+			};
+			const applied = actions.addMessage({ commit, state }, message);
+			expect(applied).toBe(true);
 			expect(commit.mock.calls).toEqual([
 				[types.ADD_MESSAGE, message],
 				[
@@ -294,9 +298,73 @@ describe('#actions', () => {
 				message_type: 1,
 				conversation_id: 1,
 			};
-			actions.addMessage({ commit }, message);
+			const state = {
+				allConversations: [{ id: 1, messages: [] }],
+			};
+			actions.addMessage({ commit, state }, message);
 			expect(commit.mock.calls).toEqual([[types.ADD_MESSAGE, message]]);
 		});
+
+		it('returns false if the conversation is not loaded', () => {
+			const message = {
+				id: 1,
+				message_type: 1,
+				conversation_id: 1,
+			};
+
+			const applied = actions.addMessage(
+				{ commit, state: { allConversations: [] } },
+				message
+			);
+
+			expect(applied).toBe(false);
+			expect(commit).not.toHaveBeenCalled();
+		});
+
+		it('ignores a replayed message with the same id and version', () => {
+			const message = {
+				id: 1,
+				message_type: 1,
+				conversation_id: 1,
+				updated_at: '2026-08-24T02:00:00Z',
+			};
+			const state = {
+				allConversations: [{ id: 1, messages: [message] }],
+			};
+
+			const isNew = actions.addMessage({ commit, state }, message);
+
+			expect(isNew).toBe(false);
+			expect(commit).not.toHaveBeenCalled();
+		});
+	});
+
+	describe('#updateMessage', () => {
+		it('ignores an older realtime update', () => {
+			const message = {
+				id: 1,
+				conversation_id: 1,
+				updated_at: '2026-08-24T01:00:00Z',
+			};
+			const state = {
+				allConversations: [
+					{
+						id: 1,
+						messages: [
+							{
+								id: 1,
+								updated_at: '2026-08-24T02:00:00Z',
+							},
+						],
+					},
+				],
+			};
+
+			const applied = actions.updateMessage({ commit, state }, message);
+
+			expect(applied).toBe(false);
+			expect(commit).not.toHaveBeenCalled();
+		});
 	});
 
 	describe('#sendMessageWithData', () => {