feat(renderer): Sidebar, FileTree, Outline components wired into AppShell

tests/component/sidebar/Sidebar.test.tsx

@@ -0,0 +1,48 @@
+import { describe, it, expect, beforeEach } from 'vitest';
+import { render, screen } from '@testing-library/react';
+import { ThemeProvider } from '@/components/theme-provider';
+import { Sidebar } from '@/components/sidebar/Sidebar';
+import { useFileStore } from '@/stores/file-store';
+import { useEditorStore } from '@/stores/editor-store';
+
+describe('Sidebar', () => {
+  beforeEach(() => {
+    useFileStore.setState({ tree: null, rootPath: null, expanded: new Set(), openTabs: [], activeTabId: null });
+    useEditorStore.setState({ buffers: new Map(), activeId: null });
+  });
+
+  it('renders without crashing with empty state in both sections', () => {
+    render(
+      <ThemeProvider defaultTheme="dark" attribute="class">
+        <Sidebar />
+      </ThemeProvider>
+    );
+    expect(screen.getByText('Files')).toBeInTheDocument();
+    expect(screen.getByText('Outline')).toBeInTheDocument();
+    expect(screen.getByText(/no folder opened/i)).toBeInTheDocument();
+    expect(screen.getByText(/no file open/i)).toBeInTheDocument();
+  });
+
+  it('renders FileTree and Outline sections', () => {
+    useFileStore.setState({
+      tree: {
+        name: 'project',
+        path: '/project',
+        isDirectory: true,
+        loaded: true,
+        children: [{ name: 'README.md', path: '/project/README.md', isDirectory: false, children: null }],
+      },
+      rootPath: '/project',
+    });
+
+    render(
+      <ThemeProvider defaultTheme="dark" attribute="class">
+        <Sidebar />
+      </ThemeProvider>
+    );
+
+    expect(screen.getByText('Files')).toBeInTheDocument();
+    expect(screen.getByText('Outline')).toBeInTheDocument();
+    expect(screen.getByText('README.md')).toBeInTheDocument();
+  });
+});