Add test-runner config to inject __test global for Storybook smoke tests

[Copilot]

Problem

Storybook test-runner failing on 11 stories with ReferenceError: __test is not defined during page.evaluate() in smoke tests. Affected form_extras.stories.tsx (Toggle, ToggleGroup, etc.) and object-grid.stories.tsx (WithActions).

Changes

Created .storybook/test-runner.ts to inject window.__test into Playwright's browser context before each story visit:

declare global {
  interface Window {
    __test?: boolean;
  }
}

const config: TestRunnerConfig = {
  async preVisit(page) {
    await page.evaluate(() => {
      window.__test = true;
    });
  },
};

The test-runner's internal evaluation code expects this global to exist but doesn't provide it by default.

Reference

https://github.com/objectstack-ai/objectui/actions/runs/21475614104/job/61858765955#step:7:1

Original prompt

引用: https://github.com/objectstack-ai/objectui/actions/runs/21475614104/job/61858765955#step:7:1

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Project	Deployment	Review	Updated (UTC)
objectui	Canceled		Jan 29, 2026 11:25am
objectui-components	Ready	Preview, Comment	Jan 29, 2026 11:25am
objectui-crm-app	Error		Jan 29, 2026 11:25am

[Copilot]

Pull request overview

Adds a Storybook test-runner configuration to prevent CI failures caused by an expected (but previously undefined) __test global in the Playwright browser context.

Changes:

• Introduce .storybook/test-runner.ts with a preVisit hook that sets window.__test = true before each story visit
• Add a TypeScript Window interface augmentation for type-safe access to window.__test

[github-actions]

✅ All checks passed!

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