Increase SSID scan retry delay to 2 seconds (#670)

When improv post-install gets 0 networks, the retry mechanism now waits
2 seconds between retries instead of 1 second, giving devices more time
to complete their network scan.

Co-authored-by: Claude Opus 4.5 <[email protected]>

Author: balloob

src/install-dialog.ts

@@ -791,7 +791,7 @@ export class EwtInstallDialog extends LitElement {
     // We will retry a few times if we don't get any results
     if (ssids.length === 0 && tries < 3) {
       console.log("SCHEDULE RETRY", tries);
-      setTimeout(() => this._updateSsids(tries + 1), 1000);
+      setTimeout(() => this._updateSsids(tries + 1), 2000);
       return;
     }