fix(ios): the strip above the page carries the page colour on releases that lay the web view out below the status bar

On iOS 27.0.x the web view started below the status bar, and the strip above it showed the view controller's black instead of the screen background. The colour behind the web view now follows the theme the UI reports through StatusBar.setStyle (the top colour of --m-scr), so the strip reads as part of the page on every release. TestFlight feedback, 5.1.3.

client/ios/App/App/TrekBridgeViewController.swift

@@ -55,6 +55,36 @@ class TrekBridgeViewController: CAPBridgeViewController {
         // A long press on a link would lift a preview of the page it points to,
         // which no native list does; the press means "drag" or nothing here.
         webView?.allowsLinkPreview = false
+        paintBehindWebView()
+    }
+
+    // MARK: - What shows where the web view does not reach
+
+    /// The UI reports its theme through StatusBar.setStyle (native/nativeApp.ts),
+    /// which lands here; the colour behind the web view follows it.
+    override func setNeedsStatusBarAppearanceUpdate() {
+        super.setNeedsStatusBarAppearanceUpdate()
+        paintBehindWebView()
+    }
+
+    /// Some iOS releases (27.0.x) lay the web view out below the status bar
+    /// instead of under it, and the strip above the page then showed this
+    /// view's black. It now carries the top colour of the screen background
+    /// (mobile.css --m-scr), so the strip reads as part of the page on every
+    /// release, and the rubber band at the ends shows the same colour.
+    private func paintBehindWebView() {
+        let dark: Bool
+        switch preferredStatusBarStyle {
+        case .lightContent: dark = true
+        case .darkContent: dark = false
+        default: dark = traitCollection.userInterfaceStyle == .dark
+        }
+        let color = dark
+            ? UIColor(red: 0x17 / 255, green: 0x17 / 255, blue: 0x1C / 255, alpha: 1)
+            : UIColor(red: 0xFB / 255, green: 0xFA / 255, blue: 0xF7 / 255, alpha: 1)
+        view.backgroundColor = color
+        webView?.scrollView.backgroundColor = color
+        webView?.underPageBackgroundColor = color
     }
 
     // MARK: - A proxy's sign-in page