fix(dashboard): fix network graph collapse by setting explicit min-height and add error visibility

server/src/dashboard.html

@@ -15,7 +15,7 @@
         
         /* Graph Panel */
         .graph-panel { flex: 2; }
-        #network-container { flex: 1; border: 1px solid #bdc3c7; border-radius: 4px; background: #fafafa; }
+        #network-container { flex: 1; min-height: 400px; position: relative; border: 1px solid #bdc3c7; border-radius: 4px; background: #fafafa; }
         
         /* Right Column */
         .right-column { flex: 1; display: flex; flex-direction: column; gap: 20px; }
@@ -119,7 +119,7 @@
                     network = new vis.Network(container, graphData, options);
                 }
             } catch (err) {
-                console.error("Failed to load graph", err);
+                console.error("Failed to load graph", err); document.getElementById("network-container").innerHTML = "<div style=\"color:red;padding:20px;\">Error loading graph: " + err.message + "</div>";
             }
         }
 
@@ -204,3 +204,4 @@
 
 
 
+