Switch tests from Jest to Vitest

[zpao]

• Replace Jest with Vitest and jsdom.
• Add Vitest config and setup; update test imports and scripts.
• Remove unused jest-dom and use the Vitest ESLint plugin for tests.
• Regenerate snapshots in Vitest format.

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	vitest@​5.0.3
	jsdom@​26.1.0 ⏵ 30.1.2	+3		+1	-2	+31
	@​vitest/​eslint-plugin@​1.6.27

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[Copilot]

Copilot review overview

🟡 Changes recommended

The obsolete jest.config.js remains and references the removed ts-jest dependency.

Review effort: Balanced
Findings: 1

Open (1)

• Remove obsolete jest.config.js referencing removed ts-jest · New

What changed in this PR

Migrates the test suite from Jest to Vitest with jsdom.

Changes:

• Adds Vitest configuration and cleanup setup.
• Updates test imports, dependencies, scripts, and ESLint integration.
• Regenerates snapshots in Vitest format.

File	Description
vitest.setup.ts	Registers post-test DOM cleanup.
vitest.config.ts	Configures Vitest with jsdom.
src/​__test__/​index.test.tsx	Replaces Jest imports with Vitest.
src/​__test__/​__snapshots__/​index.test.tsx.snap	Converts snapshots to Vitest format.
package.json	Replaces Jest tooling and test script.
eslint.config.mjs	Replaces the Jest ESLint plugin with Vitest’s plugin.

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