Use vitest browser

[darthmaim]

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[Copilot]

Pull request overview

This PR migrates the testing infrastructure from jsdom-based testing with @testing-library/react to Vitest's browser mode using Playwright and vitest-browser-react. This enables running tests in a real browser environment instead of a simulated DOM.

• Removes @testing-library/react, @testing-library/dom, and jsdom dependencies
• Adds @vitest/browser-playwright, vitest-browser-react, and Playwright for browser-based testing
• Updates test files to use async/await pattern required by browser-based testing
• Adds browser environment setup including process.env polyfill for Next.js internals

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
pnpm-lock.yaml	Updates dependencies: removes testing-library packages and jsdom, adds vitest browser packages and playwright; marks jsdom dependencies as optional
apps/web/vitest.config.mts	Replaces jsdom environment with browser mode configuration using Playwright provider
apps/web/package.json	Updates devDependencies to remove testing-library packages and add vitest browser packages
apps/web/lib/use-stable-array.test.ts	Converts tests to async/await, updates import from @testing-library/react to vitest-browser-react, adds non-null assertions for renderHook parameters
apps/web/lib/next.mock.ts	Adds browser environment polyfills for server-only mock and process.env for Next.js internals
apps/web/components/Time/countdown.test.tsx	Converts tests to async/await, updates import to vitest-browser-react, adds test case numbering for better identification
apps/web/components/Time/snapshots/countdown.test.tsx.snap	Updates snapshots with new test names, different CSS class hashes, and removes trailing commas from fragments

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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