feat(mcp): add browser_emulate_media tool and --color-scheme option

[Lars Kiesow (lkiesow)]

Lets agents check a UI in both light and dark mode. The tool wraps page.emulateMedia, so reduced motion, forced colors, contrast and the print media type are covered as well. Omitted parameters keep their current emulation state.

--color-scheme (and PLAYWRIGHT_MCP_COLOR_SCHEME) maps to contextOptions.colorScheme so a whole session can start in dark mode.

Fixes#42243

[Lars Kiesow (lkiesow)]

Sorry, in the contributor.md, I missed the

Approval Required: Only proceed with a PR once the issue has been officially assigned to you or approved for community contribution.

Closing this for now, but happy to provide the patch again

[Pavel Feldman (pavelfeldman)]

Your patch looks good, please feel free to reopen it as is. I'd probably have playwright-cli set- in the CLI instead of passing camelCase options though.

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[Yury Semikhatsky (yury-s)]

let's use kebob case to be consistent with other options

[github-actions]

Test results for "MCP"

6 failed
❌ [chrome] › mcp/config.spec.ts:203 › chromiumSandbox › --sandbox enables the sandbox @mcp-ubuntu-latest-chrome
❌ [firefox] › mcp/annotate.spec.ts:349 › should annotate when context has no fixed viewport @mcp-windows-latest-firefox
❌ [firefox] › mcp/cli-devtools.spec.ts:115 › per-part commands extract individual parts @mcp-windows-latest-firefox
❌ [firefox] › mcp/cli-save-as.spec.ts:26 › screenshot @mcp-windows-latest-firefox
❌ [firefox] › mcp/cli-save-as.spec.ts:56 › screenshot --filename infers webp from extension @mcp-windows-latest-firefox
❌ [webkit] › mcp/annotate.spec.ts:269 › should start dashboard and annotate when no dashboard is running @mcp-windows-latest-webkit

8171 passed, 1391 skipped

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Merge workflow run.