chore: migrate tests to Rstest

[chenjiahan]

This PR migrates the test runner from @playwright/test to Rstest so the template uses the Rstack testing workflow while retaining Playwright browser automation. It adds @rstest/core and @rstest/playwright, configures module reuse, and updates the existing E2E tests without changing their coverage.

Related Links

• https://rstest.rs/guide/integration/playwright

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📥 Commits

Reviewing files that changed from the base of the PR and between 8add1ab and 29aadd9.

⛔ Files ignored due to path filters (1)

• pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

📒 Files selected for processing (4)

• package.json
• pnpm-workspace.yaml
• rstest.config.ts
• test/basic/index.test.ts

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🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chenjiahan/chore-migrate-to-rstest

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[chatgpt-codex-connector]

Preserve the longer E2E test timeout

With this migration, these Rsbuild E2E tests now inherit Rstest's 5,000 ms default test timeout, whereas Playwright Test previously allowed 30,000 ms per test. In CI or on slower Windows runners, the rsbuild.build()/dev-server startup in test/basic/index.test.ts can legitimately take more than five seconds, causing the migrated suite to time out even though it passed under the old runner; set testTimeout here to preserve the previous budget.

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