fix: react key warnings from duplicate message IDs + establish jest testing framework (#655)

* fix: resolve issue #588 - react key warnings from duplicate message IDs + establish jest testing framework

* Update the makefile and workflow with the js test

* Apply suggestions from code review

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

web/tests/__mocks__/fileMock.js

@@ -0,0 +1 @@
+module.exports = 'test-file-stub';

web/tests/__mocks__/store-mock.ts

@@ -0,0 +1,19 @@
+// Mock store for testing without ESM module dependencies
+
+export const mockUseStore = {
+  getState: jest.fn(() => ({
+    responding: false,
+    messageIds: [] as string[],
+    messages: new Map(),
+    researchIds: [] as string[],
+    researchPlanIds: new Map(),
+    researchReportIds: new Map(),
+    researchActivityIds: new Map(),
+    ongoingResearchId: null,
+    openResearchId: null,
+    appendMessage: jest.fn(),
+    updateMessage: jest.fn(),
+    updateMessages: jest.fn(),
+  })),
+  setState: jest.fn(),
+};