fix: record browser startup failures (#4)

tests/viewer.cjs

@@ -4,15 +4,17 @@ const fs=require('node:fs/promises');
 const path=require('node:path');
 const assert=require('node:assert/strict');
 const base=process.env.VIEWER_URL||'http://127.0.0.1:8080';
-const out=path.resolve(__dirname,'../test-results');
+const out=process.env.VIEWER_RESULTS_DIR?path.resolve(process.env.VIEWER_RESULTS_DIR):path.resolve(__dirname,'../test-results');
 
 (async()=>{
  await fs.mkdir(out,{recursive:true});
- const browser=await chromium.launch({headless:true,...(process.env.PLAYWRIGHT_CHANNEL?{channel:process.env.PLAYWRIGHT_CHANNEL}:{})});
- const page=await browser.newPage({viewport:{width:1440,height:1000}});
- const errors=[];page.on('pageerror',e=>errors.push(String(e)));
+ let browser,page;
+ const errors=[];
  let report={status:'failed',url:base};
  try{
+  browser=await chromium.launch({headless:true,...(process.env.PLAYWRIGHT_CHANNEL?{channel:process.env.PLAYWRIGHT_CHANNEL}:{})});
+  page=await browser.newPage({viewport:{width:1440,height:1000}});
+  page.on('pageerror',e=>errors.push(String(e)));
   await page.goto(base,{waitUntil:'networkidle'});
   await page.waitForFunction(()=>document.querySelector('#loading')?.hidden && document.querySelector('#scene'));
   const data=await (await page.request.get(new URL('data/network.json',base).href)).json();
@@ -80,6 +82,9 @@ const out=path.resolve(__dirname,'../test-results');
    checks:['all facility information panels','summary counts','real search/selection clicks','missing-facility explanations',
     'unknown ID','scale reset','plan view','layer toggles','audit dialog','reset','no page errors'],
    browser:browser.version(),limitations:['Information consistency; screenshot review is separate from dimensional geometry verification.']};
- }catch(e){report.error=e.stack;await page.screenshot({path:path.join(out,'failure.png'),fullPage:true}).catch(()=>{});process.exitCode=1;}
- finally{await fs.writeFile(path.join(out,'ui-validation.json'),JSON.stringify(report,null,2));console.log(JSON.stringify(report,null,2));await browser.close();}
+ }catch(e){report.error=e.stack;if(page)await page.screenshot({path:path.join(out,'failure.png'),fullPage:true}).catch(()=>{});process.exitCode=1;}
+ finally{
+  try{await fs.writeFile(path.join(out,'ui-validation.json'),JSON.stringify(report,null,2));console.log(JSON.stringify(report,null,2));}
+  finally{if(browser)await browser.close();}
+ }
 })().catch(e=>{console.error(e);process.exitCode=1;});