fix(cli): parse negative numbers as arguments

[Yury Semikhatsky (yury-s)]

Summary

• playwright-cli mousewheel 0 -100 failed with Unknown options: --0, --1 because the vendored minimist sends everything matching /^-[^-]+/ down the short-flag branch. Upstream minimist has the same bug.
• The CLI has no non-letter short flags, so match short flags on /^-[A-Za-z]/ instead and let everything else fall through to positional arguments.
• Alternative to fix(cli): parse negative numbers as positional arguments #42324.

Fixes#42321

[github-actions]

Test results for "MCP"

1 failed
❌ [chrome] › mcp/config.spec.ts:203 › chromiumSandbox › --sandbox enables the sandbox @mcp-ubuntu-latest-chrome

8135 passed, 1341 skipped

---

Merge workflow run.

[github-actions]

Hi, I'm the Playwright bot and I took a look at the latest failing CI.

🟢 No real failures — the PR is clear

The most recent run (32407110777) has a single failure, mcp/config.spec.ts:203 › chromiumSandbox › --sandbox enables the sandbox on chrome, and it's a pre-existing flake. The negative number arguments test this PR adds — which failed on WebKit in the earlier run — now passes on every browser after the fix.

Details

This PR only touches packages/playwright-core/src/tools/cli-client/minimist.ts (short-flag matching for negative-number args) plus the new cli-parsing test. The sandbox test doesn't go through CLI number parsing, so this diff can't be responsible for it.

Pre-existing flake / infra

• [chrome] › mcp/config.spec.ts:203 › chromiumSandbox › --sandbox enables the sandbox — flaky. Across the test-results DB it fails 11 of 46 chrome runs (24%), on 4 different PRs unrelated to this one. Sandbox startup timing, not CLI parsing.

Already fixed in this PR

• [webkit] › mcp/cli-parsing.spec.ts › negative number arguments — this failed on all three WebKit bots in the first run (32396905156), where the test asserted a fractional wheel delta WebKit doesn't deliver. The current diff drops that assertion, and the test now passes on chromium, chrome, msedge, firefox and webkit in the latest run (32403589538).

_{Triaged by the Playwright bot - agent run}