Fix tab double-click rename functionality

MainWindowController.swift

@@ -52,6 +52,8 @@ class MainWindowController: NSWindowController {
     var settingsWindow: SettingsWindowController!
     var zoomedPane: TerminalSession?
     var preZoomSplitView: NSSplitView?
+    var lastTabClickTime: Date?
+    var lastTabClickIndex: Int = -1
     
     convenience init() {
         let window = NSWindow(
@@ -317,11 +319,6 @@ class MainWindowController: NSWindowController {
             tabButton.font = NSFont.systemFont(ofSize: 11)
             tabButton.translatesAutoresizingMaskIntoConstraints = false
             
-            // Add double-click for rename
-            let doubleClickGesture = NSClickGestureRecognizer(target: self, action: #selector(tabDoubleClicked(_:)))
-            doubleClickGesture.numberOfClicksRequired = 2
-            tabButton.addGestureRecognizer(doubleClickGesture)
-            
             // Highlight current tab
             if index == tabManager.currentIndex {
                 tabButton.contentTintColor = .systemBlue
@@ -421,12 +418,27 @@ class MainWindowController: NSWindowController {
     }
     
     @objc func tabClicked(_ sender: NSButton) {
-        switchToTab(index: sender.tag)
+        let index = sender.tag
+        let now = Date()
+        
+        // Check for double-click (within 0.3 seconds)
+        if let lastClick = lastTabClickTime,
+           lastTabClickIndex == index,
+           now.timeIntervalSince(lastClick) < 0.3 {
+            // Double-click detected
+            tabDoubleClicked(sender)
+            lastTabClickTime = nil
+            lastTabClickIndex = -1
+        } else {
+            // Single click
+            lastTabClickTime = now
+            lastTabClickIndex = index
+            switchToTab(index: index)
+        }
     }
     
-    @objc func tabDoubleClicked(_ sender: NSClickGestureRecognizer) {
-        guard let button = sender.view as? NSButton else { return }
-        let index = button.tag
+    @objc func tabDoubleClicked(_ sender: NSButton) {
+        let index = sender.tag
         
         let alert = NSAlert()
         alert.messageText = "Rename Tab"