Capability report: PUT /devices/{id}/report, a Capabilities section, offline devices degraded

A device reports its board, screen, camera and ports from its own
credential (16 KB, schema 1, replacing the last report), and the flows
are validated against it again. The node panel turns a reported port's
config schema into a form, a reported screen is a canvas preset and a
touch screen's first report turns Touch friendly on. An offline device
node is degraded: amber on the canvas, a warning on Home, never a fault.

frontend/src/index.css

@@ -76,6 +76,7 @@
   --color-sidebar-border: var(--sidebar-border);
   --color-sidebar-ring: var(--sidebar-ring);
   --color-status-success: var(--status-success);
+  --color-status-warning: var(--status-warning);
   --color-chart-1: var(--chart-1);
   --color-chart-2: var(--chart-2);
   --color-chart-3: var(--chart-3);
@@ -149,6 +150,7 @@
   --sidebar-border: #e4e4e4;
   --sidebar-ring: #4a7189;
   --status-success: #5e8b6d;
+  --status-warning: #b45309;
   --chart-1: #4a7189;
   --chart-2: #e26f00;
   --chart-3: #6f49ca;
@@ -191,6 +193,7 @@
   --sidebar-border: #2a2a2a;
   --sidebar-ring: #7ba3b8;
   --status-success: #87b596;
+  --status-warning: #e8a33d;
   --chart-1: #7ba3b8;
   --chart-2: #d26600;
   --chart-3: #8d71e6;