fix: recursive data nesting guard + VM destroy in uninstall wizard

- Cleaned 242MB of recursive data/data/data/ nesting
- Added nesting-guard.js: auto-detects and removes recursive duplicates at startup
- Wired VM sandbox cleanup into uninstall wizard (calls vmDestroy before regular uninstall)
- Container stats, health data, and VM disk all cleaned on uninstall

dashcaddy-installer/src/renderer/wizard.js

@@ -56,6 +56,12 @@ const state = {
     tailscaleIP: '',
     detected: false
   },
+  // Auto-updater state
+  update: {
+    available: false,
+    downloaded: false,
+    version: null
+  },
   installation: {
     status: 'pending', // pending, running, complete, error
     progress: 0,
@@ -229,6 +235,20 @@ function setupEventListeners() {
     state.installation.error = data.error || 'VM provisioning failed';
     render();
   });
+
+  // Auto-updater listeners
+  window.electronAPI.onUpdateAvailable((data) => {
+    state.update.available = true;
+    state.update.downloaded = false;
+    state.update.version = (data && data.version) ? data.version : null;
+    render();
+  });
+
+  window.electronAPI.onUpdateDownloaded((data) => {
+    state.update.downloaded = true;
+    state.update.version = (data && data.version) ? data.version : state.update.version;
+    render();
+  });
 }
 
 // Navigation
@@ -1313,6 +1333,26 @@ async function startUninstallation() {
   render();
 
   try {
+    // Destroy VM sandbox first (if it exists)
+    if (window.electronAPI.vmDestroy && state.uninstall.config?.vmInfo) {
+      state.uninstall.currentTask = 'Destroying virtual disk sandbox...';
+      render();
+      try {
+        const vmResult = await window.electronAPI.vmDestroy({
+          installPath: state.uninstall.installPath,
+          vmInfo: state.uninstall.config.vmInfo,
+          exportDataPath: state.uninstall.preserveSettings ? null : null
+        });
+        if (vmResult.success) {
+          state.uninstall.completedTasks.push({ step: 'VM sandbox removed', detail: vmResult.message || 'Virtual disk deleted' });
+          render();
+        }
+      } catch (vmErr) {
+        console.warn('VM destroy failed (non-fatal):', vmErr.message);
+        // Continue with regular uninstall even if VM destroy fails
+      }
+    }
+
     await window.electronAPI.runUninstallation({
       installPath: state.uninstall.installPath,
       preserveSettings: state.uninstall.preserveSettings,