chore(deps): update dependency vitest to v4

[Copilot]

📝 Summary

Updates vitest from v3.2.4 to v4.0.14 and fixes breaking changes in mock/constructor behavior.

🔍 Description of Changes

Vitest v4 changed how vi.fn().mockImplementation() works with new - function mocks no longer support constructor calls. This broke several test mocks.

Fixes:

• Constructor mocks - Replaced vi.fn().mockImplementation() with actual class definitions for:

  • Notification mock in dynamic-favicon.test.tsx
  • WebSocket mock in waitForWs.test.ts
  • ClipboardItem mock in common.ts

• JSON.rawJSON compatibility - Added fallback in json-parser.ts for Node 20 environments where JSON.rawJSON isn't available (Node 21+ only)

Before (broken in v4):

global.WebSocket = vi.fn().mockImplementation(() => ({
  close: vi.fn(),
  onopen: null,
}));

After:

class MockWebSocket {
  close = vi.fn();
  onopen: (() => void) | null = null;
  constructor(_url: string) { mockInstances.push(this); }
}
global.WebSocket = MockWebSocket as unknown as typeof WebSocket;

📋 Checklist

• I have read the contributor guidelines.
• For large changes, or changes that affect the public API: this change was discussed or approved through an issue, on Discord, or the community discussions (Please provide a link if applicable).
• I have added tests for the changes made.
• I have run the code and verified that it works as expected.

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Project	Deployment	Preview	Comments	Updated (UTC)
marimo-docs	Ready	Preview	Comment	Dec 2, 2025 8:32pm

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• example.com
  • Triggering command: /usr/local/bin/node /usr/local/bin/node --conditions node --conditions development --experimental-import-meta-resolve --require /home/REDACTED/work/marimo/marimo/node_modules/.pnpm/vitest@4.0.15_@opentelemetry+api@1.9.0_@types+node@24.10.1_esbuild@0.25.9_jiti@2.6.1_js_22adc03545082b1ad035e4488b6e1ff3/node_modules/vitest/suppress-warnings.cjs /home/REDACTED/work/marimo/marimo/node_modules/.pnpm/vitest@4.0.15_@opentelemetry+api@1.9.0_@types+node@24.10.1_esbuild@0.25.9_jiti@2.6.1_js_22adc03545082b1ad035e4488b6e1ff3/node_modules/vitest/dist/workers/forks.js (dns block)
• marimo.app
  • Triggering command: /usr/local/bin/node /usr/local/bin/node --conditions node --conditions development --experimental-import-meta-resolve --require /home/REDACTED/work/marimo/marimo/node_modules/.pnpm/vitest@4.0.15_@opentelemetry+api@1.9.0_@types+node@24.10.1_esbuild@0.25.9_jiti@2.6.1_js_22adc03545082b1ad035e4488b6e1ff3/node_modules/vitest/suppress-warnings.cjs /home/REDACTED/work/marimo/marimo/node_modules/.pnpm/vitest@4.0.15_@opentelemetry+api@1.9.0_@types+node@24.10.1_esbuild@0.25.9_jiti@2.6.1_js_22adc03545082b1ad035e4488b6e1ff3/node_modules/vitest/dist/workers/forks.js (dns block)

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