fix(network-topology): harden with edge-case fixes, logging, and test coverage (#583)

* fix(network-topology): harden with edge-case fixes, logging, and test coverage

Fixes stale data on node switch (topology now refreshes when active node changes),
adds manual refresh button to toolbar, and guards against containers with empty
Names arrays by falling back to a 12-char short ID. Adds operational and diagnostic
logging around topology fetches, and introduces 25 unit tests covering happy paths,
system network filtering, stack resolution, container deduplication, edge cases,
and error handling.

* docs: refresh screenshots

backend/src/services/DockerController.ts

@@ -438,6 +438,8 @@ class DockerController {
     knownStackNames: string[],
     includeSystem: boolean,
   ): Promise<TopologyNetwork[]> {
+    const debug = isDebugEnabled();
+    const t0 = debug ? Date.now() : 0;
     const knownSet = new Set(knownStackNames);
 
     const [rawNetworks, rawContainers, projectToStack] = await Promise.all([
@@ -505,7 +507,7 @@ class DockerController {
 
         topology.containers.push({
           id: c.Id,
-          name: (c.Names?.[0] ?? '').replace(/^\//, ''),
+          name: (c.Names?.[0] ?? '').replace(/^\//, '') || (c.Id ?? '').substring(0, 12),
           ip: netInfo.IPAddress ?? '',
           state: c.State ?? 'unknown',
           image: c.Image ?? '',
@@ -514,7 +516,20 @@ class DockerController {
       }
     }
 
-    return Array.from(networkMap.values());
+    const result = Array.from(networkMap.values());
+
+    if (debug) {
+      const totalContainers = result.reduce((sum, n) => sum + n.containers.length, 0);
+      console.debug('[Resources:debug] Topology built', {
+        ms: Date.now() - t0,
+        networks: result.length,
+        containers: totalContainers,
+        systemFiltered: !includeSystem,
+        stacksKnown: knownStackNames.length,
+      });
+    }
+
+    return result;
   }
 
   /** Resolves a Docker Compose project label to a known Sencho stack name, or null. */