Revert Grafana iframe embedding attempt

Iframe approach didn't work well:
- Homepage iframe widget only supports height, not width constraints
- Some panels fail to load even with anonymous auth
- Reverted to authenticated-only Grafana access

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

argocd/manifests/grafana/values.yaml

@@ -26,16 +26,8 @@ grafana.ini:
   server:
     root_url: https://grafana.tail8d86e.ts.net
   security:
-    # Allow embedding panels in iframes (for Homepage dashboard)
-    allow_embedding: true
-    # Required for iframe session cookies
-    cookie_samesite: lax
-  auth.anonymous:
-    # WARNING: All dashboards readable without login
-    # Security relies on Tailscale ACLs - only tailnet members can reach Grafana
-    # Required for iframe embeds with template variables and non-Prometheus datasources
-    enabled: true
-    org_role: Viewer
+    # Embedding disabled - iframe approach didn't work well for Homepage
+    allow_embedding: false
   analytics:
     check_for_updates: false
     reporting_enabled: false

argocd/manifests/homepage/values.yaml

@@ -73,24 +73,6 @@ config:
                   format:
                     type: bytes
 
-    # Metrics group - Grafana panel embeds
-    - Metrics:
-        - Tesla Battery:
-            widget:
-              type: iframe
-              src: https://grafana.ops.eblu.me/d-solo/WopVO_mgz/tesla-charge-level?orgId=1&from=now-2d&to=now&timezone=browser&var-car_id=1&var-base_url=https://tesla.ops.eblu.me&var-bucket_width=7200&panelId=2&theme=dark
-              classes: h-96 w-72
-        - Outside Temp:
-            widget:
-              type: iframe
-              src: https://grafana.ops.eblu.me/d-solo/kOuP_Fggz/tesla-overview?orgId=1&from=now-24h&to=now&timezone=browser&var-car_id=All&var-length_unit=mi&var-temp_unit=F&var-preferred_range=rated&var-base_url=https://tesla.ops.eblu.me&refresh=30s&panelId=8&theme=dark
-              classes: h-40 w-48
-        - Inside Temp:
-            widget:
-              type: iframe
-              src: https://grafana.ops.eblu.me/d-solo/kOuP_Fggz/tesla-overview?orgId=1&from=now-24h&to=now&timezone=browser&var-car_id=All&var-length_unit=mi&var-temp_unit=F&var-preferred_range=rated&var-base_url=https://tesla.ops.eblu.me&refresh=30s&panelId=9&theme=dark
-              classes: h-40 w-48
-
   # External bookmarks
   bookmarks:
     - Admin:
@@ -124,8 +106,6 @@ config:
     layout:
       Host Services:
         style: column
-      Metrics:
-        style: row
       Apps:
         style: column
       Observability: