chore: use vitest 😼

[gabrielmfern]

Replaces jest with vitest, and uses vitest-fetch-mock instead of jest-fetch-mock

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Summary by cubic

Switch the test suite from Jest to Vitest for faster runs and simpler setup. Replaces jest-fetch-mock with vitest-fetch-mock and updates configs and scripts.

• Refactors

  • Added vitest.config.ts (globals, node env, clear/restore mocks, setupFiles) and src/test/setup.ts to enable fetch mocks via vitest.
  • Removed jest.config.ts and jest.setup.ts; cleaned specs to drop enableFetchMocks and use the global fetchMock; set tsconfig types to vitest/globals.

• Dependencies

  • Removed jest, jest-fetch-mock, and @types/jest; added vitest and vitest-fetch-mock.
  • Updated scripts: test uses "vitest run" and watch uses "vitest".

[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@​3.2.4
	@​types/​node@​18.19.86 ⏵ 20.19.11	+1		+1
	vitest-fetch-mock@​0.4.5

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[cubic-dev-ai]

No issues found across 14 files