fix: skip deleted entries in navigation history

frontend/src/App.svelte

@@ -304,14 +304,19 @@
     try {
       if (snapshot.nodeId) {
         const node = await wailsCall('GetNodeDetail', snapshot.nodeId)
-        if (node) {
-          await selectNode(node)
-          activeTab = snapshot.tab || 'overview'
-          if (activeTab === 'files' && fileItems.length === 0) {
-            await loadFolder(node.id)
-          }
+        if (!node) {
+          return false
         }
+        await selectNode(node)
+        activeTab = snapshot.tab || 'overview'
+        if (activeTab === 'files' && fileItems.length === 0) {
+          await loadFolder(node.id)
+        }
+        return true
       } else if (snapshot.section) {
+        if (!systemViews.some(view => view.id === snapshot.section)) {
+          return false
+        }
         await selectSystemView(snapshot.section)
         if (snapshot.section === 'trash') {
           trashFolderId = snapshot.trashFolderId || ''
@@ -319,7 +324,11 @@
           trashSelectedIds = []
           await refreshTrash()
         }
+        return true
       }
+      return false
+    } catch (e) {
+      return false
     } finally {
       restoringHistory = false
     }
@@ -327,10 +336,11 @@
 
   async function goBack() {
     if (closeTopModalForBack()) return
-    const snapshot = navHistory[navHistory.length - 1]
-    if (!snapshot) return
-    navHistory = navHistory.slice(0, -1)
-    await restoreNavigation(snapshot)
+    while (navHistory.length > 0) {
+      const snapshot = navHistory[navHistory.length - 1]
+      navHistory = navHistory.slice(0, -1)
+      if (await restoreNavigation(snapshot)) return
+    }
   }
 
   function handleMouseNav(e) {