fix(B04): prevent image URI flash across initial render and detail remounts

scripts/verify-b04-image-native.cjs

@@ -0,0 +1,30 @@
+/** Optional, isolated own-component Electron frame probe; never launches the user's app.
+ * Build first: node scripts/test-image-lifecycle.mjs --build-only
+ * Then: electron scripts/verify-b04-image-native.cjs <output-directory>
+ * Requires a permitted graphical environment. Never pass --no-sandbox. */
+const {app,BrowserWindow,session}=require('electron')
+const fs=require('node:fs'),path=require('node:path'),os=require('node:os')
+const fixture=path.resolve(process.argv[2]||'')
+if(!process.argv[2]||!fs.existsSync(path.join(fixture,'index.html')))throw Error('Supply build-only fixture directory')
+const profile=fs.mkdtempSync(path.join(os.tmpdir(),'ycode-b04-native-'))
+app.setPath('userData',profile)
+let timer,win,finished=false
+function finish(error,report){
+ if(finished)return;finished=true;clearTimeout(timer)
+ const result={result:error?'FAIL':'PASS',error:error?String(error):undefined,report,limits:'Synthetic own-component Electron fixture, not the installed application or original reference UI.'}
+ fs.writeFileSync(path.join(fixture,'native-report.json'),JSON.stringify(result,null,2))
+ console.log(JSON.stringify({result:result.result,error:result.error,output:path.join(fixture,'native-report.json')}))
+ if(win&&!win.isDestroyed())win.destroy()
+ app.exit(error?1:0)
+}
+app.whenReady().then(async()=>{
+ session.defaultSession.webRequest.onBeforeRequest((details,callback)=>callback({cancel:!['file:','data:','blob:','devtools:'].some(p=>details.url.startsWith(p))}))
+ win=new BrowserWindow({width:1000,height:800,show:true,webPreferences:{nodeIntegration:false,contextIsolation:true,sandbox:true}})
+ win.webContents.on('render-process-gone',(_,details)=>finish(Error('Renderer gone: '+details.reason)))
+ timer=setTimeout(()=>finish(Error('Bounded native probe timed out after 20s')),20000)
+ await win.loadFile(path.join(fixture,'index.html'))
+ const report=await win.webContents.executeJavaScript(`new Promise((resolve,reject)=>{const check=()=>{if(window.__b04Error)return reject(Error(window.__b04Error));if(window.__b04Report)return resolve(window.__b04Report);setTimeout(check,25)};check()})`)
+ if(!report.samples.some(s=>s.height>0))throw Error('No nonzero native layout measured')
+ if(report.samples.some(s=>s.textLength>1000||s.height>2000))throw Error('Unexpected address-sized text/height spike')
+ finish(null,report)
+}).catch(error=>finish(error))