feat: update Glance to v0.8.3

- Updated image version from latest to v0.8.3
- Deployed and verified successful upgrade
- New features available: theme picker, authentication, to-do widget

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

roles/docker/templates/glance-compose.yml.j2

@@ -1,6 +1,6 @@
 services:
   glance:
-    image: glanceapp/glance
+    image: glanceapp/glance:v0.8.3
     volumes:
       - ./config:/app/config
       - /etc/timezone:/etc/timezone:ro