sync pulsenode config.yml: brand icons, drop stale accent override

Mirrors the pulsenode app repo's updated config.yml (v0.3.0): removes
the leftover --pn-accent: #38bdf8 override that was masking the new
neon-green default, and adds icon: entries for every service that has
a brand match in lib/brand-icons.ts.

pulsenode/config/config.yml

@@ -3,8 +3,6 @@ settings:
 
 theme:
   mode: dark
-  variables:
-    --pn-accent: "#38bdf8"
 
 # Manual widgets below always take precedence over an auto-discovered one for
 # the same container - this is on as a safety net for anything added to
@@ -21,6 +19,7 @@ groups:
       - type: docker
         name: Traefik
         containerName: traefik
+        icon: traefik
         interval: 10s
         # No href: the dashboard is disabled (--api.dashboard=false).
         # Swap for a `traefik` widget (router/entrypoint/middleware view)
@@ -29,6 +28,7 @@ groups:
       - type: docker
         name: Coolify
         containerName: coolify
+        icon: coolify
         href: https://${TRAEFIK_HOST_COOLIFY}
         interval: 10s
 
@@ -37,12 +37,14 @@ groups:
       - type: docker
         name: Gitea
         containerName: gitea
+        icon: gitea
         href: https://${TRAEFIK_HOST_GITEA}
         interval: 10s
 
       - type: docker
         name: Gitea Runner
         containerName: gitea_runner
+        icon: gitea
         showStats: true
         interval: 15s
 
@@ -57,35 +59,41 @@ groups:
       - type: docker
         name: Immich
         containerName: immich
+        icon: immich
         href: https://${TRAEFIK_HOST_IMMICH}
         interval: 10s
 
       - type: docker
         name: Immich ML
         containerName: immich_ml
+        icon: immich
         interval: 15s
 
       - type: docker
         name: n8n
         containerName: n8n
+        icon: n8n
         href: https://${TRAEFIK_HOST_N8N}
         interval: 10s
 
       - type: docker
         name: Passbolt
         containerName: passbolt
+        icon: passbolt
         href: https://${TRAEFIK_HOST_PASSBOLT}
         interval: 10s
 
       - type: docker
         name: Umami
         containerName: umami
+        icon: umami
         href: https://${TRAEFIK_HOST_UMAMI}
         interval: 10s
 
       - type: docker
         name: Headscale
         containerName: headscale
+        icon: headscale
         href: https://${TRAEFIK_HOST_HEADSCALE}
         interval: 10s