fix: per-item loading animations in instance list

- Replace full-screen loading with per-instance busy state
- Add busy overlay with spinner to instance cards
- Disable action buttons while instance is busy
- Add CSS for visual dimming and overlay positioning

Fixes add-config-profiles: instance UI polish

apps/web/src/components/instance-list.tsx

@@ -43,6 +43,9 @@ export const InstanceList = ({ projectId, repoId, projectName, repoName, toolTyp
   const [profileSelectInstanceId, setProfileSelectInstanceId] = useState<string | null>(null);
   const [selectedProfileForAction, setSelectedProfileForAction] = useState("");
 
+  // Per-instance busy state for actions
+  const [busyInstanceId, setBusyInstanceId] = useState<string | null>(null);
+
   const loadInstances = useCallback(async () => {
     setLoading(true);
     try {
@@ -104,6 +107,7 @@ export const InstanceList = ({ projectId, repoId, projectName, repoName, toolTyp
   }, [projectId]);
 
   const handleStart = async (instanceId: string, configProfileId?: string) => {
+    setBusyInstanceId(instanceId);
     try {
       await startInstance(projectId, repoId, instanceId, configProfileId);
       setProfileSelectInstanceId(null);
@@ -111,20 +115,26 @@ export const InstanceList = ({ projectId, repoId, projectName, repoName, toolTyp
       await loadInstances();
     } catch {
       setError("Failed to start instance");
+    } finally {
+      setBusyInstanceId(null);
     }
   };
 
   const handleStop = async (instanceId: string) => {
+    setBusyInstanceId(instanceId);
     try {
       await stopInstance(projectId, repoId, instanceId);
       setStopConfirmId(null);
       await loadInstances();
     } catch {
       setError("Failed to stop instance");
+    } finally {
+      setBusyInstanceId(null);
     }
   };
 
   const handleRestart = async (instanceId: string, configProfileId?: string) => {
+    setBusyInstanceId(instanceId);
     try {
       await restartInstance(projectId, repoId, instanceId, configProfileId);
       setProfileSelectInstanceId(null);
@@ -132,26 +142,34 @@ export const InstanceList = ({ projectId, repoId, projectName, repoName, toolTyp
       await loadInstances();
     } catch {
       setError("Failed to restart instance");
+    } finally {
+      setBusyInstanceId(null);
     }
   };
 
   const handleDelete = async (instanceId: string) => {
     if (!confirm("Are you sure you want to delete this instance?")) return;
+    setBusyInstanceId(instanceId);
     try {
       await deleteInstance(projectId, repoId, instanceId);
       // Update state immediately instead of reloading
       setInstances(prev => prev.filter(i => i.id !== instanceId));
     } catch {
       setError("Failed to delete instance");
+    } finally {
+      setBusyInstanceId(null);
     }
   };
 
   const handleRecreateTunnel = async (instanceId: string) => {
+    setBusyInstanceId(instanceId);
     try {
       await recreateInstanceTunnel(projectId, repoId, instanceId);
       await loadInstances();
     } catch {
       setError("Failed to recreate tunnel");
+    } finally {
+      setBusyInstanceId(null);
     }
   };
 
@@ -202,7 +220,13 @@ export const InstanceList = ({ projectId, repoId, projectName, repoName, toolTyp
       ) : (
         <div className="instance-grid">
           {instances.map((instance) => (
-            <div key={instance.id} className="instance-card">
+            <div key={instance.id} className={`instance-card ${busyInstanceId === instance.id ? "busy" : ""}`}>
+              {busyInstanceId === instance.id && (
+                <div className="instance-busy-overlay">
+                  <Icon name="loading" size="md" />
+                  <span>Working...</span>
+                </div>
+              )}
               <div className="instance-info">
                 <div className="instance-name">{instance.display_name}</div>
                 <div className="instance-meta">
@@ -244,6 +268,7 @@ export const InstanceList = ({ projectId, repoId, projectName, repoName, toolTyp
                         onClick={() => void handleRecreateTunnel(instance.id)}
                         type="button"
                         title="Recreate tunnel"
+                        disabled={busyInstanceId === instance.id}
                       >
                         <Icon name="refresh" size="sm" />
                         Fix Tunnel
@@ -256,6 +281,7 @@ export const InstanceList = ({ projectId, repoId, projectName, repoName, toolTyp
                     className="secondary-button small"
                     onClick={() => navigate(`/instances/${instance.id}/terminal`)}
                     type="button"
+                    disabled={busyInstanceId === instance.id}
                   >
                     <Icon name="terminal" size="sm" />
                     Terminal
@@ -280,6 +306,7 @@ export const InstanceList = ({ projectId, repoId, projectName, repoName, toolTyp
                           className="primary-button small"
                           onClick={() => void handleStart(instance.id, selectedProfileForAction || undefined)}
                           type="button"
+                          disabled={busyInstanceId === instance.id}
                         >
                           <Icon name="play" size="sm" />
                           Start
@@ -291,6 +318,7 @@ export const InstanceList = ({ projectId, repoId, projectName, repoName, toolTyp
                             setSelectedProfileForAction("");
                           }}
                           type="button"
+                          disabled={busyInstanceId === instance.id}
                         >
                           Cancel
                         </button>
@@ -307,6 +335,7 @@ export const InstanceList = ({ projectId, repoId, projectName, repoName, toolTyp
                           setSelectedProfileForAction(instance.selected_config_profile_id || "");
                         }}
                         type="button"
+                        disabled={busyInstanceId === instance.id}
                       >
                         <Icon name="play" size="sm" />
                         Start
@@ -323,6 +352,7 @@ export const InstanceList = ({ projectId, repoId, projectName, repoName, toolTyp
                           className="ghost-button small danger-text"
                           onClick={() => void handleStop(instance.id)}
                           type="button"
+                          disabled={busyInstanceId === instance.id}
                         >
                           Yes
                         </button>
@@ -330,6 +360,7 @@ export const InstanceList = ({ projectId, repoId, projectName, repoName, toolTyp
                           className="ghost-button small"
                           onClick={() => setStopConfirmId(null)}
                           type="button"
+                          disabled={busyInstanceId === instance.id}
                         >
                           No
                         </button>
@@ -339,6 +370,7 @@ export const InstanceList = ({ projectId, repoId, projectName, repoName, toolTyp
                         className="ghost-button small"
                         onClick={() => setStopConfirmId(instance.id)}
                         type="button"
+                        disabled={busyInstanceId === instance.id}
                       >
                         <Icon name="stop" size="sm" />
                       </button>
@@ -360,6 +392,7 @@ export const InstanceList = ({ projectId, repoId, projectName, repoName, toolTyp
                           className="primary-button small"
                           onClick={() => void handleRestart(instance.id, selectedProfileForAction || undefined)}
                           type="button"
+                          disabled={busyInstanceId === instance.id}
                         >
                           <Icon name="refresh" size="sm" />
                           Restart
@@ -371,6 +404,7 @@ export const InstanceList = ({ projectId, repoId, projectName, repoName, toolTyp
                             setSelectedProfileForAction("");
                           }}
                           type="button"
+                          disabled={busyInstanceId === instance.id}
                         >
                           Cancel
                         </button>
@@ -387,6 +421,7 @@ export const InstanceList = ({ projectId, repoId, projectName, repoName, toolTyp
                           setSelectedProfileForAction(instance.selected_config_profile_id || "");
                         }}
                         type="button"
+                        disabled={busyInstanceId === instance.id}
                       >
                         <Icon name="refresh" size="sm" />
                       </button>
@@ -397,6 +432,7 @@ export const InstanceList = ({ projectId, repoId, projectName, repoName, toolTyp
                   className="ghost-button small danger-text"
                   onClick={() => void handleDelete(instance.id)}
                   type="button"
+                  disabled={busyInstanceId === instance.id}
                 >
                   <Icon name="delete" size="sm" />
                 </button>

apps/web/src/styles.css

@@ -2449,6 +2449,7 @@ a.nav-item,
   background: var(--bg);
   border: 1px solid var(--border);
   border-radius: 10px;
+  position: relative;
 }
 
 .instance-info {
@@ -2481,6 +2482,24 @@ a.nav-item,
   align-items: center;
 }
 
+.instance-card.busy {
+  opacity: 0.7;
+}
+
+.instance-busy-overlay {
+  position: absolute;
+  inset: 0;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  gap: var(--space-2);
+  background: rgba(var(--bg-rgb, 255, 255, 255), 0.8);
+  border-radius: 10px;
+  z-index: 1;
+  font-size: var(--text-sm);
+  color: var(--muted);
+}
+
 /* ============================================
    Terminal Styles
    ============================================ */