diff --git a/src/components/studio/views/mindmap-view-coverage.test.tsx b/src/components/studio/views/mindmap-view-coverage.test.tsx
new file mode 100644
index 00000000..bfea3f79
--- /dev/null
+++ b/src/components/studio/views/mindmap-view-coverage.test.tsx
@@ -0,0 +1,354 @@
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest'
+import type { ReactNode } from 'react'
+import { render, screen, fireEvent, waitFor, cleanup } from '@testing-library/react'
+
+vi.mock('framer-motion', () => ({
+  motion: {
+    div: ({ children, initial: _i, animate: _a, transition: _t, exit: _e, ...props }: { children?: ReactNode; [key: string]: unknown }) => (
+      <div {...(props as React.HTMLAttributes<HTMLDivElement>)}>{children}</div>
+    ),
+  },
+  AnimatePresence: ({ children }: { children?: ReactNode }) => <>{children}</>,
+}))
+
+vi.mock('lucide-react', () => {
+  const I = ({ className }: { className?: string }) => (
+    <span data-testid="icon" className={className} />
+  )
+  return {
+    BrainCircuit: I,
+    Plus: I,
+    Trash2: I,
+    Edit3: I,
+    Undo2: I,
+    Redo2: I,
+    RefreshCw: I,
+    Download: I,
+    ChevronRight: I,
+    ChevronDown: I,
+    Sliders: I,
+  }
+})
+
+vi.mock('@/lib/studio/use-reduced-motion', () => ({
+  useReducedMotion: () => true,
+}))
+
+vi.mock('@/lib/utils', () => ({
+  cn: (...args: (string | undefined | false | null)[]) => args.filter(Boolean).join(' '),
+}))
+
+vi.mock('../ui/shared-primitives', () => ({
+  Divider: () => <hr data-testid="divider" />,
+}))
+
+vi.mock('sonner', () => ({
+  toast: { success: vi.fn(), error: vi.fn(), info: vi.fn() },
+}))
+
+vi.mock('./export-helpers', () => ({
+  todayStamp: () => '2026-01-01',
+  downloadBlob: vi.fn(),
+}))
+
+const mockSelectEntity = vi.fn()
+const mockSetView = vi.fn()
+const mockCommitEntity = vi.fn()
+const mockDeleteEntity = vi.fn()
+const mockStartEdit = vi.fn()
+const mockUndo = vi.fn()
+const mockRedo = vi.fn()
+
+const childEntity = {
+  id: 'ent-2',
+  name: 'Child Entity',
+  type: 'note' as const,
+  description: 'child',
+  content: '',
+  tags: [],
+  createdAt: new Date().toISOString(),
+  updatedAt: new Date().toISOString(),
+  links: [
+    { targetId: 'ent-3', relation: 'contains' },
+  ],
+}
+
+const grandchildEntity = {
+  id: 'ent-3',
+  name: 'Grandchild Entity',
+  type: 'project' as const,
+  description: 'grandchild',
+  content: '',
+  tags: [],
+  createdAt: new Date().toISOString(),
+  updatedAt: new Date().toISOString(),
+  links: [],
+}
+
+const mockEntities = [
+  {
+    id: 'ent-1',
+    name: 'Root Entity',
+    type: 'concept' as const,
+    description: 'root',
+    content: '',
+    tags: [],
+    createdAt: new Date().toISOString(),
+    updatedAt: new Date().toISOString(),
+    links: [
+      { targetId: 'ent-2', relation: 'contains' },
+    ],
+  },
+  childEntity,
+  grandchildEntity,
+]
+
+let currentEntities = mockEntities
+let currentHistoryIndex = 0
+let currentEntityHistory: unknown[][] = [[]]
+
+vi.mock('@/lib/studio/store', () => ({
+  useStudioStore: (selector: (s: Record<string, unknown>) => unknown) =>
+    selector({
+      entities: currentEntities,
+      selectEntity: mockSelectEntity,
+      setView: mockSetView,
+      commitEntity: mockCommitEntity,
+      deleteEntity: mockDeleteEntity,
+      startEdit: mockStartEdit,
+      undo: mockUndo,
+      redo: mockRedo,
+      entityHistory: currentEntityHistory,
+      historyIndex: currentHistoryIndex,
+    }),
+}))
+
+import { MindMapView } from './mindmap-view'
+import * as exportHelpers from './export-helpers'
+
+describe('MindMapView branch coverage', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+    currentEntities = mockEntities
+    currentHistoryIndex = 0
+    currentEntityHistory = [[]]
+    vi.spyOn(crypto, 'randomUUID').mockReturnValue('new-child-id')
+  })
+
+  afterEach(() => {
+    cleanup()
+    vi.restoreAllMocks()
+  })
+
+  it('shows empty state when no entities', () => {
+    currentEntities = []
+    render(<MindMapView />)
+    expect(screen.getByText(/Add entities with links to build a mind map/)).toBeDefined()
+    expect(screen.getByText('No data')).toBeDefined()
+  })
+
+  it('selects entity and switches to editor on node click', () => {
+    render(<MindMapView />)
+    const node = screen.getByText('Root Entity')
+    fireEvent.click(node)
+    expect(mockSelectEntity).toHaveBeenCalledWith('ent-1')
+    expect(mockSetView).toHaveBeenCalledWith('editor')
+  })
+
+  it('selects entity and switches to editor on Enter key', () => {
+    render(<MindMapView />)
+    const node = screen.getByText('Root Entity')
+    fireEvent.keyDown(node, { key: 'Enter' })
+    expect(mockSelectEntity).toHaveBeenCalledWith('ent-1')
+    expect(mockSetView).toHaveBeenCalledWith('editor')
+  })
+
+  it('selects entity and switches to editor on Space key', () => {
+    render(<MindMapView />)
+    const node = screen.getByText('Root Entity')
+    fireEvent.keyDown(node, { key: ' ' })
+    expect(mockSelectEntity).toHaveBeenCalledWith('ent-1')
+    expect(mockSetView).toHaveBeenCalledWith('editor')
+  })
+
+  it('focuses a node and tracks focusedNodeId', () => {
+    render(<MindMapView />)
+    const node = screen.getByText('Root Entity')
+    fireEvent.focus(node.parentElement as HTMLElement)
+    expect(node.parentElement).toHaveAttribute('tabIndex', '0')
+  })
+
+  it('expands a collapsed node with ArrowRight', async () => {
+    render(<MindMapView />)
+    const node = screen.getByText('Root Entity')
+    fireEvent.keyDown(node, { key: 'ArrowRight' })
+    await waitFor(() => {
+      expect(screen.getByText('Child Entity')).toBeDefined()
+    })
+  })
+
+  it('collapses an expanded node with ArrowLeft', async () => {
+    render(<MindMapView />)
+    const node = screen.getByText('Root Entity')
+    fireEvent.keyDown(node, { key: 'ArrowRight' })
+    await waitFor(() => {
+      expect(screen.getByText('Child Entity')).toBeDefined()
+    })
+    fireEvent.keyDown(node, { key: 'ArrowLeft' })
+    // Child should still be rendered because root is always expanded at level 0
+    expect(screen.getByText('Child Entity')).toBeDefined()
+  })
+
+  it('focuses next node with ArrowDown', async () => {
+    render(<MindMapView />)
+    const node = screen.getByText('Root Entity')
+    const parent = node.closest('[role="treeitem"]') as HTMLElement
+    fireEvent.keyDown(parent, { key: 'ArrowDown' })
+    // ArrowDown calls focus on the next treeitem; we can only verify no throw
+    expect(parent).toBeDefined()
+  })
+
+  it('focuses previous node with ArrowUp', async () => {
+    render(<MindMapView />)
+    const node = screen.getByText('Root Entity')
+    const parent = node.closest('[role="treeitem"]') as HTMLElement
+    fireEvent.keyDown(parent, { key: 'ArrowUp' })
+    expect(parent).toBeDefined()
+  })
+
+  it('jumps to first node with Home', () => {
+    render(<MindMapView />)
+    const node = screen.getByText('Root Entity')
+    const parent = node.closest('[role="treeitem"]') as HTMLElement
+    fireEvent.keyDown(parent, { key: 'Home' })
+    expect(parent).toBeDefined()
+  })
+
+  it('jumps to last node with End', () => {
+    render(<MindMapView />)
+    const node = screen.getByText('Root Entity')
+    const parent = node.closest('[role="treeitem"]') as HTMLElement
+    fireEvent.keyDown(parent, { key: 'End' })
+    expect(parent).toBeDefined()
+  })
+
+  it('adds child when toolbar button is clicked and a node is focused', () => {
+    render(<MindMapView />)
+    fireEvent.focus(screen.getByText('Root Entity').closest('[role="treeitem"]') as HTMLElement)
+    fireEvent.click(screen.getByLabelText('Add child'))
+    expect(mockCommitEntity).toHaveBeenCalledTimes(2)
+  })
+
+  it('starts editing focused node when rename button is clicked', () => {
+    render(<MindMapView />)
+    fireEvent.focus(screen.getByText('Root Entity').closest('[role="treeitem"]') as HTMLElement)
+    fireEvent.click(screen.getByLabelText('Rename'))
+    expect(mockStartEdit).toHaveBeenCalledWith('ent-1')
+  })
+
+  it('deletes focused node when delete button is clicked', () => {
+    render(<MindMapView />)
+    fireEvent.focus(screen.getByText('Root Entity').closest('[role="treeitem"]') as HTMLElement)
+    fireEvent.click(screen.getByLabelText('Delete'))
+    expect(mockDeleteEntity).toHaveBeenCalledWith('ent-1')
+  })
+
+  it('adds child via global Ctrl+Tab keyboard shortcut', () => {
+    render(<MindMapView />)
+    const canvas = screen.getByRole('tree', { name: 'Knowledge mind map' }).parentElement as HTMLElement
+    fireEvent.focus(screen.getByText('Root Entity').closest('[role="treeitem"]') as HTMLElement)
+    fireEvent.keyDown(canvas, { key: 'Tab', ctrlKey: true })
+    expect(mockCommitEntity).toHaveBeenCalledTimes(2)
+  })
+
+  it('starts editing via global F2 keyboard shortcut', () => {
+    render(<MindMapView />)
+    const canvas = screen.getByRole('tree', { name: 'Knowledge mind map' }).parentElement as HTMLElement
+    fireEvent.focus(screen.getByText('Root Entity').closest('[role="treeitem"]') as HTMLElement)
+    fireEvent.keyDown(canvas, { key: 'F2' })
+    expect(mockStartEdit).toHaveBeenCalledWith('ent-1')
+  })
+
+  it('deletes focused node via global Delete keyboard shortcut', () => {
+    render(<MindMapView />)
+    const canvas = screen.getByRole('tree', { name: 'Knowledge mind map' }).parentElement as HTMLElement
+    fireEvent.focus(screen.getByText('Root Entity').closest('[role="treeitem"]') as HTMLElement)
+    fireEvent.keyDown(canvas, { key: 'Delete' })
+    expect(mockDeleteEntity).toHaveBeenCalledWith('ent-1')
+  })
+
+  it('deletes focused node via global Backspace keyboard shortcut', () => {
+    render(<MindMapView />)
+    const canvas = screen.getByRole('tree', { name: 'Knowledge mind map' }).parentElement as HTMLElement
+    fireEvent.focus(screen.getByText('Root Entity').closest('[role="treeitem"]') as HTMLElement)
+    fireEvent.keyDown(canvas, { key: 'Backspace' })
+    expect(mockDeleteEntity).toHaveBeenCalledWith('ent-1')
+  })
+
+  it('changes root entity via selector', () => {
+    render(<MindMapView />)
+    const select = screen.getByLabelText('Root entity')
+    fireEvent.change(select, { target: { value: 'ent-2' } })
+    expect(select).toHaveValue('ent-2')
+  })
+
+  it('changes tree depth via slider', () => {
+    render(<MindMapView />)
+    const slider = screen.getByLabelText('Tree depth')
+    fireEvent.change(slider, { target: { value: '5' } })
+    expect(slider).toHaveValue('5')
+  })
+
+  it('toggles compact mode', () => {
+    render(<MindMapView />)
+    const button = screen.getByText('Compact')
+    fireEvent.click(button)
+    expect(button).toHaveAttribute('aria-pressed', 'true')
+  })
+
+  it('syncs tree when sync button is clicked', () => {
+    render(<MindMapView />)
+    fireEvent.click(screen.getByLabelText('Sync'))
+    expect(screen.getByText('Root: Root Entity')).toBeDefined()
+  })
+
+  it('exports PNG when export button is clicked', () => {
+    const downloadBlobMock = vi.spyOn(exportHelpers, 'downloadBlob').mockImplementation(() => {})
+    render(<MindMapView />)
+    fireEvent.click(screen.getByLabelText('Export PNG'))
+    expect(downloadBlobMock).not.toHaveBeenCalled()
+  })
+
+  it('undoes last action when undo is clicked and history allows', () => {
+    currentHistoryIndex = 1
+    currentEntityHistory = [[], []]
+    render(<MindMapView />)
+    fireEvent.click(screen.getByLabelText('Undo'))
+    expect(mockUndo).toHaveBeenCalled()
+  })
+
+  it('redoes action when redo is clicked and history allows', () => {
+    currentHistoryIndex = 0
+    currentEntityHistory = [[], []]
+    render(<MindMapView />)
+    fireEvent.click(screen.getByLabelText('Redo'))
+    expect(mockRedo).toHaveBeenCalled()
+  })
+
+  it('renders expand/collapse chevron for nodes with children', () => {
+    render(<MindMapView />)
+    expect(screen.getByLabelText('Collapse')).toBeDefined()
+  })
+
+  it('toggles node expansion when chevron is clicked', () => {
+    render(<MindMapView />)
+    // The root is always expanded; the child (level 1) starts collapsed.
+    const expandButton = screen.getByLabelText('Expand')
+    fireEvent.click(expandButton)
+    // After expanding the child, both root and child show Collapse.
+    expect(screen.getAllByLabelText('Collapse').length).toBe(2)
+    fireEvent.click(screen.getAllByLabelText('Collapse')[1])
+    // The child collapses again; the Expand label reappears.
+    expect(screen.getByLabelText('Expand')).toBeDefined()
+  })
+})