Improve titlebar site identity: prefer page title, hide URL while loading

- Prefer document title over host; treat URL-like title strings as
  provisional and ignore them until a real title is available.
- While webView.isLoading with no usable title, show "Loading…"
  instead of hostname or URL; observe isLoading to refresh when done.
- Initial center label uses launcher title or "Browser" (not host).
- Remove duplicate window title override in didFinish.

Made-with: Cursor

google_apps/InAppBrowserWindow.swift

@@ -120,6 +120,10 @@ final class InAppBrowserWindowController: NSWindowController, NSWindowDelegate {
     private var siteNameLabel: NSTextField!
     private var siteIconView: NSImageView!
     private var currentSiteIconURLKey: String?
+    /// Keeps the center title in sync when `document.title` changes after load (e.g. SPAs).
+    private var titleObservation: NSKeyValueObservation?
+    /// Refreshes site identity when loading starts/stops.
+    private var loadingObservation: NSKeyValueObservation?
     private var isPinnedOnTop = false
     private var isGestureModeEnabled = true
 
@@ -314,12 +318,18 @@ final class InAppBrowserWindowController: NSWindowController, NSWindowDelegate {
         webView.uiDelegate = self
         webView.navigationDelegate = self
         webView.allowsBackForwardNavigationGestures = true
+        titleObservation = webView.observe(\.title, options: [.new]) { [weak self] _, _ in
+            self?.updateSiteNameFromWebView()
+        }
+        loadingObservation = webView.observe(\.isLoading, options: [.new]) { [weak self] _, _ in
+            self?.updateSiteNameFromWebView()
+        }
         isGestureModeEnabled = true
 
         // Initialize toolbar state.
         setToggledStyle(pinButton, isOn: isPinnedOnTop)
         setToggledStyle(handButton, isOn: isGestureModeEnabled)
-        siteNameLabel.stringValue = windowTitle ?? (initialURL.host ?? "Browser")
+        siteNameLabel.stringValue = windowTitle ?? "Browser"
         updateToolbarState()
     }
 
@@ -531,10 +541,36 @@ final class InAppBrowserWindowController: NSWindowController, NSWindowDelegate {
         window?.performClose(nil)
     }
 
+    /// WKWebView often reports the requested URL as `title` until the real document title is available.
+    private func isLikelyURLString(_ raw: String) -> Bool {
+        let t = raw.trimmingCharacters(in: .whitespacesAndNewlines)
+        if t.isEmpty { return false }
+        if t.hasPrefix("http://") || t.hasPrefix("https://") { return true }
+        if t.contains("://") { return true }
+        if let u = URL(string: t), u.scheme != nil, u.host != nil { return true }
+        return false
+    }
+
     private func updateSiteNameFromWebView() {
+        let loading = webView.isLoading
         let host = webView.url?.host?.trimmingCharacters(in: .whitespacesAndNewlines)
-        let pageTitle = webView.title?.trimmingCharacters(in: .whitespacesAndNewlines)
-        let preferred = (host?.isEmpty == false) ? host! : ((pageTitle?.isEmpty == false) ? pageTitle! : "Browser")
+        let rawTitle = webView.title?.trimmingCharacters(in: .whitespacesAndNewlines)
+        let pageTitle: String? = {
+            guard let rawTitle, !rawTitle.isEmpty else { return nil }
+            return isLikelyURLString(rawTitle) ? nil : rawTitle
+        }()
+
+        // Prefer document title; never show hostname or URL-like strings while a load is in progress.
+        let preferred: String
+        if let pageTitle {
+            preferred = pageTitle
+        } else if loading {
+            preferred = "Loading…"
+        } else if let host, !host.isEmpty {
+            preferred = host
+        } else {
+            preferred = "Browser"
+        }
 
         siteNameLabel.stringValue = preferred
         window?.title = preferred
@@ -602,10 +638,6 @@ extension InAppBrowserWindowController: WKNavigationDelegate {
     }
 
     func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
-        if let host = webView.url?.host, !host.isEmpty {
-            window?.title = host
-        }
-
         updateToolbarState()
     }