chore(ci): probe Windows runner for Copilot setup

[JReinhold]

This PR temporarily switches the Copilot setup workflow to windows-latest so cloud Copilot runs can validate Windows-compatible CI commands.\n\nFollow-up expected in this same PR:\n- update to run on ubuntu + windows via matrix\n- keep non-test jobs ubuntu-only\n- if needed, guard Playwright install flags by OS\n- restore back to ubuntu-latest before merge\n

[JReinhold]

@copilot Please implement the CI follow-up in this PR:\n\n1. Update so only the job uses a strategy matrix for and .\n2. Keep all non-test jobs Ubuntu-only.\n3. Make any required OS-specific adjustments for Playwright setup so Windows test runs pass.\n4. Revert back to in your final commit.\n5. Keep changes minimal and focused on CI YAML only.\n\nPlease run/validate via GitHub Actions and iterate until green.

[Copilot]

@JReinhold I've opened a new pull request, #184, to work on those changes. Once the pull request is ready, I'll request review from you.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 4eec4f7

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[pkg-pr-new]

npm i https://pkg.pr.new/storybookjs/mcp/@storybook/addon-mcp@183

npm i https://pkg.pr.new/storybookjs/mcp/@storybook/mcp@183

commit: 4eec4f7

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
438	1	437	0

View the full list of 1 ❄️ flaky test(s)

apps/internal-storybook/tests/check-deps.e2e.test.ts > Storybook Dependencies > should be using latest versions from registry

Flake rate in main: 35.71% (Passed 45 times, Failed 25 times)

Stack Traces | 5.37s run time

Error: Storybook dependencies are outdated. Update the catalog in pnpm-workspace.yaml:

  sed -i '' 's/10\.3\.0-alpha\.15/10.3.0-alpha.16/g' pnpm-workspace.yaml && pnpm install

Outdated packages:
  - @storybook/addon-docs: 10.3.0-alpha.15 → 10.3.0-alpha.16
  - @storybook/react-vite: 10.3.0-alpha.15 → 10.3.0-alpha.16
  - storybook: 10.3.0-alpha.15 → 10.3.0-alpha.16
 ❯ tests/check-deps.e2e.test.ts:42:10

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[codecov]

Bundle Report

Changes will decrease total bundle size by 47.98kB (-100.0%) ⬇️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
@storybook/mcp-esm	(removed)	-42.92kB (-100.0%) ⬇️
@storybook/addon-mcp-esm	(removed)	-5.05kB (-100.0%) ⬇️