feat(workspace): sidebar as a plain file explorer

frontend/src/features/workspace/__tests__/WorkspaceView.sidebar.test.tsx

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+import React from 'react';
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { render, screen, waitFor } from '@testing-library/react';
+import { WorkspaceView } from '../WorkspaceView';
+import { api } from '../../../lib/api';
+import { Document } from '../../../lib/types';
+
+vi.mock('../DocumentEditor', () => ({
+  DocumentEditor: () => <div data-testid="document-editor">DocumentEditor</div>,
+}));
+
+vi.mock('../../../lib/api', async (importOriginal) => {
+  const actual = await importOriginal<typeof import('../../../lib/api')>();
+  return {
+    ...actual,
+    api: {
+      ...actual.api,
+      getDocuments: vi.fn(),
+      getFolders: vi.fn(),
+      getSharedFolders: vi.fn(),
+      getWorkspaceTags: vi.fn(),
+      getTrash: vi.fn(),
+    },
+    onWebSocketMessage: vi.fn(() => () => {}),
+    triggerHaptic: vi.fn(),
+  };
+});
+
+const makeDoc = (overrides: Partial<Document> & { id: string; title: string }): Document => ({
+  id: overrides.id,
+  userId: 'u1',
+  title: overrides.title,
+  icon: '📝',
+  folderPath: '',
+  content: '',
+  blocks: [],
+  tags: [],
+  isPinned: false,
+  isArchived: false,
+  createdAt: '2026-10-29T10:00:00Z',
+  updatedAt: '2026-10-29T10:00:00Z',
+  ...overrides,
+});
+
+describe('WorkspaceView sidebar explorer', () => {
+  beforeEach(() => {
+    vi.restoreAllMocks();
+    vi.mocked(api.getFolders).mockResolvedValue([]);
+    vi.mocked(api.getSharedFolders).mockResolvedValue([]);
+    vi.mocked(api.getWorkspaceTags).mockResolvedValue([]);
+    vi.mocked(api.getTrash).mockResolvedValue([]);
+  });
+
+  it('renders empty state "Noch keine Notizen" when there are no notes and no folders', async () => {
+    vi.mocked(api.getDocuments).mockResolvedValue([]);
+    vi.mocked(api.getFolders).mockResolvedValue([]);
+
+    render(<WorkspaceView onStatsChange={vi.fn()} />);
+
+    await waitFor(() => {
+      expect(screen.getByText('Noch keine Notizen')).toBeTruthy();
+    });
+
+    expect(screen.queryByText('Angeheftet')).toBeNull();
+    expect(screen.queryByText('Ordner')).toBeNull();
+    expect(screen.queryByText('Notizen (Hauptebene)')).toBeNull();
+    expect(screen.queryByText('Keine Notizen auf der Hauptebene.')).toBeNull();
+  });
+
+  it('renders pinned docs, folders, and root docs without headings', async () => {
+    const docs: Document[] = [
+      makeDoc({
+        id: 'doc_pin_root',
+        title: 'Wichtige Pinned Notiz',
+        icon: '⭐',
+        isPinned: true,
+      }),
+      makeDoc({
+        id: 'doc_root',
+        title: 'Normale Root Notiz',
+        icon: '📝',
+      }),
+      makeDoc({
+        id: 'doc_in_folder',
+        title: 'Projekt Plan',
+        icon: '📄',
+        folderPath: 'Projekte',
+      }),
+    ];
+
+    vi.mocked(api.getDocuments).mockResolvedValue(docs);
+    vi.mocked(api.getFolders).mockResolvedValue(['Projekte']);
+
+    render(<WorkspaceView onStatsChange={vi.fn()} />);
+
+    await waitFor(() => {
+      expect(screen.getByText('Wichtige Pinned Notiz')).toBeTruthy();
+      expect(screen.getByText('Normale Root Notiz')).toBeTruthy();
+      expect(screen.getByText('Projekte')).toBeTruthy();
+    });
+
+    // Ensure no old headings are rendered
+    expect(screen.queryByText('Angeheftet')).toBeNull();
+    expect(screen.queryByText('Ordner')).toBeNull();
+    expect(screen.queryByText('Notizen (Hauptebene)')).toBeNull();
+    expect(screen.queryByText('Keine Notizen auf der Hauptebene.')).toBeNull();
+
+    // The pinned root doc appears only once
+    const pinnedMatches = screen.getAllByText('Wichtige Pinned Notiz');
+    expect(pinnedMatches.length).toBe(1);
+
+    // Pinned container has separator when items follow
+    const pinnedItem = screen.getByText('Wichtige Pinned Notiz').closest('div[draggable="true"]');
+    const pinnedContainer = pinnedItem?.parentElement;
+    expect(pinnedContainer?.className).toContain('border-b border-border pb-1.5 mb-1.5');
+  });
+
+  it('does not render separator under pinned notes when nothing follows', async () => {
+    const docs: Document[] = [
+      makeDoc({
+        id: 'doc_pin_only',
+        title: 'Einzige Notiz Pinned',
+        icon: '⭐',
+        isPinned: true,
+      }),
+    ];
+
+    vi.mocked(api.getDocuments).mockResolvedValue(docs);
+    vi.mocked(api.getFolders).mockResolvedValue([]);
+
+    render(<WorkspaceView onStatsChange={vi.fn()} />);
+
+    await waitFor(() => {
+      expect(screen.getByText('Einzige Notiz Pinned')).toBeTruthy();
+    });
+
+    const pinnedItem = screen.getByText('Einzige Notiz Pinned').closest('div[draggable="true"]');
+    const pinnedContainer = pinnedItem?.parentElement;
+    expect(pinnedContainer?.className).not.toContain('border-b');
+  });
+
+  it('keeps pinned note in folder visible in its folder', async () => {
+    const docs: Document[] = [
+      makeDoc({
+        id: 'doc_pin_in_folder',
+        title: 'Pinned im Ordner',
+        icon: '📌',
+        folderPath: 'Team',
+        isPinned: true,
+      }),
+    ];
+
+    vi.mocked(api.getDocuments).mockResolvedValue(docs);
+    vi.mocked(api.getFolders).mockResolvedValue(['Team']);
+
+    render(<WorkspaceView onStatsChange={vi.fn()} />);
+
+    await waitFor(() => {
+      // In pinned list
+      expect(screen.getByText('Pinned im Ordner')).toBeTruthy();
+      // Folder exists
+      expect(screen.getByText('Team')).toBeTruthy();
+    });
+  });
+});