fix(ai): prevent race condition in login modal initialization (agent)

Removes a premature call to `initializeLoginModalController` in `ApplicationBootstrap` which was attempting to initialize the login modal before the DOM was fully hydrated, causing a "modal container not found" warning during startup. The modal is already correctly initialized later in `js/index.js` after markup loading completes.

js/ui/applicationBootstrap.js

@@ -395,8 +395,6 @@ export default class ApplicationBootstrap {
     app.loginModalController = null;
     app.currentUserNpub = null;
 
-    app.initializeLoginModalController({ logIfMissing: true });
-
     app.profileButton = doc?.getElementById("profileButton") || null;
     app.profileAvatar = doc?.getElementById("profileAvatar") || null;