Минимизированный call-бар: UIKit additionalSafeAreaInsets для сдвига навбара, Telegram-style градиент и UI-рефакторинг

Rosetta/DesignSystem/Components/CallBarSafeAreaBridge.swift

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+import SwiftUI
+
+// MARK: - Call Bar Safe Area Bridge
+
+/// UIKit bridge that pushes NavigationStack's nav bar down by setting
+/// `additionalSafeAreaInsets.top` on every UINavigationController in the window.
+///
+/// `UIViewController.navigationController` walks UP the parent chain — but the
+/// bridge VC is a SIBLING of NavigationStack's UINavigationController, not a child.
+/// So we walk DOWN from the window's root VC to find all navigation controllers.
+struct CallBarSafeAreaBridge: UIViewRepresentable {
+    let topInset: CGFloat
+
+    func makeUIView(context: Context) -> CallBarInsetView {
+        let view = CallBarInsetView()
+        view.isHidden = true
+        view.isUserInteractionEnabled = false
+        return view
+    }
+
+    func updateUIView(_ view: CallBarInsetView, context: Context) {
+        view.topInset = topInset
+        view.applyInset()
+    }
+}
+
+/// Invisible UIView that finds all UINavigationControllers in the window
+/// and sets `additionalSafeAreaInsets.top` on each.
+final class CallBarInsetView: UIView {
+    var topInset: CGFloat = 0
+    private var lastAppliedInset: CGFloat = -1
+
+    override func didMoveToWindow() {
+        super.didMoveToWindow()
+        lastAppliedInset = -1 // Force re-apply
+        applyInset()
+    }
+
+    func applyInset() {
+        guard topInset != lastAppliedInset else { return }
+        guard let window, let rootVC = window.rootViewController else { return }
+        Self.apply(inset: topInset, in: rootVC)
+        lastAppliedInset = topInset
+    }
+
+    /// Recursively walk child view controllers (NOT presentedViewController)
+    /// and set additionalSafeAreaInsets.top on every UINavigationController.
+    private static func apply(inset: CGFloat, in vc: UIViewController) {
+        if let nav = vc as? UINavigationController,
+           nav.additionalSafeAreaInsets.top != inset {
+            nav.additionalSafeAreaInsets.top = inset
+        }
+        for child in vc.children {
+            apply(inset: inset, in: child)
+        }
+    }
+}
+
+extension View {
+    /// Push NavigationStack's nav bar down by `inset` points.
+    /// Uses UIKit `additionalSafeAreaInsets` — the only reliable mechanism.
+    func callBarSafeAreaInset(_ inset: CGFloat) -> some View {
+        background(
+            CallBarSafeAreaBridge(topInset: inset)
+                .frame(width: 0, height: 0)
+                .allowsHitTesting(false)
+        )
+    }
+}