chore: refactorings for sidebar handling

tests/renderer/components/SidebarChat.test.tsx

@@ -0,0 +1,67 @@
+import React from 'react';
+import { describe, it, expect, beforeEach, vi } from 'vitest';
+import { act, render, screen } from '@testing-library/react';
+import { Sidebar } from '../../../src/renderer/components/Sidebar/Sidebar';
+import { useAppStore } from '../../../src/renderer/store';
+
+describe('Sidebar chat list behavior', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+
+    (window as any).electronAPI = {
+      ...(window as any).electronAPI,
+      chat: {
+        getConversations: vi.fn(),
+        checkReady: vi.fn().mockResolvedValue({ ready: true }),
+        onTitleUpdated: vi.fn(() => () => {}),
+        createConversation: vi.fn(),
+        deleteConversation: vi.fn(),
+      },
+    };
+
+    useAppStore.setState({
+      activeProject: null,
+      activeView: 'chat',
+      sidebarVisible: true,
+      tabs: [],
+      activeTabId: null,
+    });
+  });
+
+  it('reloads chat conversations when active project becomes available after mount', async () => {
+    const getConversationsMock = vi
+      .fn()
+      .mockResolvedValueOnce([])
+      .mockResolvedValueOnce([
+        {
+          id: 'conv-1',
+          title: 'Project Conversation',
+          createdAt: '2026-02-22T00:00:00.000Z',
+          updatedAt: '2026-02-22T00:00:00.000Z',
+        },
+      ]);
+
+    (window as any).electronAPI.chat.getConversations = getConversationsMock;
+
+    render(<Sidebar />);
+
+    expect(await screen.findByText('No conversations yet')).toBeInTheDocument();
+
+    act(() => {
+      useAppStore.setState({
+        activeProject: {
+          id: 'project-1',
+          name: 'Project 1',
+          slug: 'project-1',
+          dataPath: '/tmp/project-1',
+          isActive: true,
+          createdAt: '2026-02-22T00:00:00.000Z',
+          updatedAt: '2026-02-22T00:00:00.000Z',
+        },
+      });
+    });
+
+    expect(await screen.findByText('Project Conversation')).toBeInTheDocument();
+    expect(getConversationsMock).toHaveBeenCalledTimes(2);
+  });
+});