fix(ui,auth): fix login overlay styles, PWA service worker scope, favicon, and update user config to kopri

docker-compose.yml

@@ -12,6 +12,6 @@ services:
       - PORT=8002
       - DEBUG=False
       - SECRET_KEY=study-qpid-pro-secret-key-change-in-prod
-      - ADMIN_USERNAME=admin
-      - ADMIN_PASSWORD=adminpass
+      - ADMIN_USERNAME=kopri
+      - ADMIN_PASSWORD=kopri2026pass
       - DB_PATH=/app/data/notes.db