fix: use bunx instead of npx to read Playwright versions under Bun

`getPlaywrightBrowsers()` hardcoded `npx playwright install --dry-run`. A
Bun-only environment has no `npx` on PATH, so `execSync` throws and the catch
reports `Playwright not installed` on a working install. That is a false
negative rather than a visible error, so it reads as a real misconfiguration.

Pick the package runner from the runtime that is actually executing, via
`process.versions.bun`, the same detection already used by `getRuntimeInfo()`.
`bunx playwright install --dry-run` resolves the local
`node_modules/.bin/playwright` and emits output identical to the `npx` form, so
`parsePlaywrightBrowsers()` is unaffected and Node behaviour is unchanged.

This is the only place CodeceptJS shells out to `npx`; every other occurrence
under `lib/` is documentation text. It removes the need to symlink `npx` to
`bun` in Bun images.

Closes #5713

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: Jaromir Obr

lib/command/info.js

@@ -21,9 +21,16 @@ function parsePlaywrightBrowsers(output) {
   return versions.join(', ')
 }
 
+// Bun has its own package runner and a Bun-only install has no `npx` on PATH at all, so the
+// runner has to follow the runtime that is actually executing rather than what PATH happens to hold.
+function getPackageRunner() {
+  if (process.versions.bun) return 'bunx'
+  return 'npx'
+}
+
 async function getPlaywrightBrowsers() {
   try {
-    const info = execSync('npx playwright install --dry-run').toString().trim()
+    const info = execSync(`${getPackageRunner()} playwright install --dry-run`).toString().trim()
     return parsePlaywrightBrowsers(info)
   } catch (err) {
     return 'Playwright not installed'
@@ -85,7 +92,7 @@ export default async function (path) {
   output.print('***************************************')
 }
 
-export { parsePlaywrightBrowsers, getRuntimeInfo }
+export { parsePlaywrightBrowsers, getRuntimeInfo, getPackageRunner }
 
 export const getMachineInfo = async () => {
   const info = {

test/unit/command/info_test.js

@@ -1,5 +1,5 @@
 import { expect } from 'chai'
-import { parsePlaywrightBrowsers, getRuntimeInfo } from '../../../lib/command/info.js'
+import { parsePlaywrightBrowsers, getRuntimeInfo, getPackageRunner } from '../../../lib/command/info.js'
 
 describe('info command', () => {
   describe('getRuntimeInfo', () => {
@@ -42,6 +42,32 @@ describe('info command', () => {
     })
   })
 
+  describe('getPackageRunner', () => {
+    let originalBunVersion
+
+    beforeEach(() => {
+      originalBunVersion = process.versions.bun
+    })
+
+    afterEach(() => {
+      if (originalBunVersion === undefined) {
+        delete process.versions.bun
+      } else {
+        process.versions.bun = originalBunVersion
+      }
+    })
+
+    it('should use bunx when running under Bun', () => {
+      process.versions.bun = '1.4.2'
+      expect(getPackageRunner()).to.equal('bunx')
+    })
+
+    it('should use npx when not running under Bun', () => {
+      delete process.versions.bun
+      expect(getPackageRunner()).to.equal('npx')
+    })
+  })
+
   describe('parsePlaywrightBrowsers', () => {
     describe('old format (Playwright < 1.58)', () => {
       const oldFormatOutput = `browser: chromium version 140.0.7339.186