todomvc-test: fix dotenv dependency and verbosity

[TerrorJack]

This patch adds missing dotenv dependency to todomvc-test, and sets quiet: true when loading dotenv config, otherwise dotenv spams the terminal with emojis and tips that completely destroys the list reporter.

[github-actions]

Test results for "tests 1"

4 flaky

⚠️ [chromium-page] › page/page-request-continue.spec.ts:754 › propagate headers cross origin redirect after interception `@ubuntu-22.04-chromium-tip-of-tree`
⚠️ [firefox-library] › library/inspector/cli-codegen-1.spec.ts:1082 › cli codegen › should not throw csp directive violation errors `@firefox-ubuntu-22.04-node20`
⚠️ [firefox-page] › page/page-wait-for-function.spec.ts:104 › should work with strict CSP policy `@firefox-ubuntu-22.04-node20`
⚠️ [playwright-test] › runner.spec.ts:124 › should ignore subprocess creation error because of SIGINT `@macos-latest-node20`

34669 passed, 695 skipped

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Merge workflow run.

[github-actions]

Test results for "MCP"

10 failed
❌ [webkit] › mcp/snapshot-mode.spec.ts:58 › should respect --snapshot-mode=incremental @mcp-windows-latest
❌ [chrome] › mcp/cli.spec.ts:274 › save as › screenshot --full-page @mcp-macos-15
❌ [chromium] › mcp/cli.spec.ts:169 › core › dialog-accept @mcp-macos-15
❌ [chromium] › mcp/cli.spec.ts:274 › save as › screenshot --full-page @mcp-macos-15
❌ [chromium] › mcp/cli.spec.ts:349 › devtools › tracing-start-stop @mcp-macos-15
❌ [chromium] › mcp/launch.spec.ts:21 › test reopen browser @mcp-macos-15
❌ [firefox] › mcp/cli.spec.ts:274 › save as › screenshot --full-page @mcp-macos-15
❌ [firefox] › mcp/cli.spec.ts:349 › devtools › tracing-start-stop @mcp-macos-15
❌ [webkit] › mcp/cli.spec.ts:274 › save as › screenshot --full-page @mcp-macos-15
❌ [webkit] › mcp/snapshot-mode.spec.ts:58 › should respect --snapshot-mode=incremental @mcp-macos-15

3104 passed, 305 skipped

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Merge workflow run.