[Feature]: Ignore persistent connections (like WebSockets) in page.waitForLoadState('networkidle')

[ksn5]

Problem
page.waitForLoadState('networkidle') never resolves if the page opens a WebSocket, SSE, or other persistent request, because those connections stay open forever

Example (current behavior)

await page.waitForLoadState('networkidle'); 
// ❌ Never resolves if a WebSocket is active

Proposed solution
Add an option (or new mode) to ignore persistent connections when waiting for network idle.

// Option 1: flag
await page.waitForLoadState('networkidle', { ignorePersistent: true });

// Option 2: alias
await page.waitForLoadState('networkidle-ignore-persistent');

This would:

• Ignore WebSocket and SSE connections
• Still wait for other requests to finish (XHR, fetch, etc.)
• Avoid hanging forever while keeping the page readiness check reliable