fix: context menu close, OpenFolder for TypeFile nodes, tab highlight visibility

- FileTreeRow handleShowInFolder now closes the menu (menuOpen = false)
- OpenFolder: TypeFile nodes with empty FsPath fall back to file record path
- Active tab background increased to rgba(99,102,241,0.12), weight 600, border #818cf8

cmd/verstak-gui/bindings_settings.go

@@ -118,9 +118,21 @@ func (a *App) OpenFolder(nodeID string) error {
 	if err != nil {
 		return err
 	}
-	target := filepath.Join(a.vault, n.FsPath)
-	if n.Type == nodes.TypeFile {
+	var target string
+	if n.Type == nodes.TypeFile && n.FsPath == "" {
+		records, _ := a.files.ListByNode(nodeID)
+		if len(records) > 0 {
+			target = filepath.Join(a.vault, records[0].Path)
+		}
+		if target == "" {
+			target = a.vault
+		}
 		target = filepath.Dir(target)
+	} else {
+		target = filepath.Join(a.vault, n.FsPath)
+		if n.Type == nodes.TypeFile {
+			target = filepath.Dir(target)
+		}
 	}
 	if _, err := os.Stat(target); os.IsNotExist(err) {
 		target = a.vault

cmd/verstak-gui/frontend-dist/index.html

@@ -16,8 +16,8 @@
       background: #13131f;
     }
   </style>
-  <script type="module" crossorigin src="/assets/main-43Kzwqa7.js"></script>
-  <link rel="stylesheet" crossorigin href="/assets/main-D6qvckLy.css">
+  <script type="module" crossorigin src="/assets/main-CuGUigdf.js"></script>
+  <link rel="stylesheet" crossorigin href="/assets/main-D-hpY-IS.css">
 </head>
 <body>
   <div id="app"></div>