fix(org-chart): improve auto connector contrast and test portability

examples/org-chart/verify-p3.mjs

@@ -1,3 +1,4 @@
+import { loadPlaywright, launchChromium } from '../../scripts/orgchart-browser-runtime.mjs';
 import http from 'node:http';
 import path from 'node:path';
 import { readFile, mkdir, writeFile } from 'node:fs/promises';
@@ -13,8 +14,7 @@ const fixturePath = path.join(root, 'examples/org-chart/data-p1.json');
 const fixtureBytes = await readFile(fixturePath);
 const fixtureHash = createHash('sha256').update(fixtureBytes).digest('hex');
 const fixture = JSON.parse(fixtureBytes.toString('utf8'));
-const playwrightPath = process.env.ORGCHART_PLAYWRIGHT_MODULE ?? 'C:\\Users\\user\\.cache\\codex-runtimes\\codex-primary-runtime\\dependencies\\node\\node_modules\\playwright\\index.mjs';
-const { chromium } = await import(pathToFileURL(playwrightPath).href);
+await loadPlaywright();
 const viewports = [{ width: 1920, height: 1080 }, { width: 1440, height: 900 }, { width: 1280, height: 800 }, { width: 768, height: 1024 }, { width: 390, height: 844 }];
 const results = [], measurements = [], interactions = [], errors = [], screenshots = [], servers = [];
 const check = (condition, name, detail) => results.push({ name, status: condition ? 'PASS' : 'FAIL', ...(detail === undefined ? {} : { detail }) });
@@ -333,7 +333,7 @@ try {
   // The user identified the live 6041 Storybook; never silently verify a stale
   // storybook-static build from P2 instead of that requested running server.
   const storybookOrigin = process.env.ORGCHART_STORYBOOK_URL?.replace(/\/$/, '') ?? 'http://127.0.0.1:6041';
-  browser = await chromium.launch({ executablePath: process.env.ORGCHART_CHROME ?? 'C:\\Program Files\\Google\\Chrome\\Application\\chrome.exe', headless: true });
+  browser = await launchChromium({ headless: true });
   const context = await browser.newContext({ deviceScaleFactor: 1, reducedMotion: 'reduce' });
   const routes = [
     { label: 'html', transport: 'html', url: `${htmlOrigin}/p1.html?mode=readOnly` },