test(studio): add test to prevent per-cell context menu regression

Asserts that only a single ContextMenu instance is mounted regardless of
row count. This guards against the previous bug where each cell had its
own Radix ContextMenu, causing thousands of document-level keydown
listeners and freezing the browser.

apps/studio/tests/components/SQLEditor/Results.test.tsx

@@ -0,0 +1,64 @@
+import { screen } from '@testing-library/react'
+import Results from 'components/interfaces/SQLEditor/UtilityPanel/Results'
+import { customRender as render } from 'tests/lib/custom-render'
+import { expect, test, vi } from 'vitest'
+
+// Track how many times ContextMenu is mounted to detect per-cell instances
+let contextMenuMountCount = 0
+
+vi.mock('ui', async () => {
+  const actual = await vi.importActual<typeof import('ui')>('ui')
+  return {
+    ...actual,
+    ContextMenu_Shadcn_: (props: any) => {
+      contextMenuMountCount++
+      return <actual.ContextMenu_Shadcn_ {...props} />
+    },
+  }
+})
+
+vi.mock('react-data-grid', () => ({
+  default: ({ columns, rows }: any) => (
+    <div role="table">
+      <div role="row">
+        {columns.map((col: any, colIdx: number) => (
+          <div key={colIdx} role="columnheader">
+            {col.renderHeaderCell ? col.renderHeaderCell({}) : col.name}
+          </div>
+        ))}
+      </div>
+      {rows.map((row: any, rowIdx: number) => (
+        <div key={rowIdx} role="row">
+          {columns.map((col: any, colIdx: number) => (
+            <div key={colIdx} role="cell">
+              {col.renderCell?.({ row, rowIdx, isCellSelected: false })}
+            </div>
+          ))}
+        </div>
+      ))}
+    </div>
+  ),
+}))
+
+function generateRows(count: number) {
+  return Array.from({ length: count }, (_, i) => ({
+    id: i,
+    name: `row-${i}`,
+  }))
+}
+
+test('renders a single context menu regardless of row count', () => {
+  contextMenuMountCount = 0
+  const rows = generateRows(100)
+  render(<Results rows={rows} />)
+
+  // There should be exactly 1 ContextMenu instance (shared), not 1 per cell.
+  // Previously each cell rendered its own ContextMenu, causing thousands of
+  // document-level event listeners and freezing the browser on keystrokes.
+  expect(contextMenuMountCount).toBe(1)
+})
+
+test('shows empty state when no rows provided', () => {
+  render(<Results rows={[]} />)
+  expect(screen.getByText('Success. No rows returned')).toBeTruthy()
+})