fix(e2e): pin @playwright/test to 1.61.1 to match nixpkgs browsers

[jinglemansweep]

Summary

Pin @playwright/test to exact 1.61.1 to match the browser binaries provided by nixpkgs, and disable future Renovate updates for this package.

Problem

Renovate PR #340 bumped @playwright/test from 1.61.1 to 1.62.0 (the caret ^1.61.1 allowed the minor bump). On this NixOS system, Playwright browser binaries are managed by nixpkgs (playwright.browsers), which provides Playwright 1.61.1 with browser revision 1228. Playwright 1.62.0 expects revision 1234, which doesn't exist in the Nix store path (PLAYWRIGHT_BROWSERS_PATH), causing:

Error: browserType.launch: Executable doesn't exist at
/nix/store/.../chromium_headless_shell-1234/chrome-headless-shell-linux64/chrome-headless-shell

Changes

• package.json: "@playwright/test": "^1.61.1" -> "1.61.1" (exact pin, no caret)
• package-lock.json: downgraded @playwright/test, playwright, playwright-core from 1.62.0 to 1.61.1
• renovate.json: added packageRules entry to disable updates for @playwright/test

Verification

• npx playwright test --list — 41 tests collected, browser binary found
• npx tsc --noEmit — clean
• npx tsc -p e2e/tsconfig.json --noEmit — clean
• pre-commit — all green

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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