feat(pose_3d): workspace check client-side (ghost verde/rosso) + SHOULDER da URDF

web/pose_3d.css

@@ -105,6 +105,15 @@
 #tab-pose-3d .p3-status.ok { color: #3ecf8e; }
 #tab-pose-3d .p3-status.error { color: #e74c3c; }
 
+#tab-pose-3d .p3-feasibility {
+  font-size: 12px;
+  margin-bottom: 6px;
+  font-family: monospace;
+  min-height: 1em;
+}
+#tab-pose-3d .p3-feasibility.ok { color: #3ecf8e; }
+#tab-pose-3d .p3-feasibility.error { color: #e74c3c; }
+
 #tab-pose-3d button {
   background: #2a3038;
   border: 1px solid #3a4048;