revert: remove fake delegate calls for tab bar minimize

Calling scrollViewWillBeginDragging/DidEndDragging on the delegate
didn't trigger tabBarMinimizeBehavior — iOS 26 likely tracks actual
touch events, not delegate calls. Reverted to avoid side effects.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ios/Platform/Platform/Features/Reader/Views/ScrollViewDriver.swift

@@ -81,10 +81,7 @@ struct ScrollViewDriver: UIViewRepresentable {
             if scrollView == nil {
                 findScrollView(from: view)
             }
-            guard let sv = scrollView else { return }
+            guard scrollView != nil else { return }
-
-            // Signal scroll start — triggers tab bar minimize
-            originalDelegate?.scrollViewWillBeginDragging?(sv)
 
             let link = CADisplayLink(target: self, selector: #selector(tick))
             link.preferredFrameRateRange = CAFrameRateRange(minimum: 30, maximum: 60)
@@ -95,12 +92,6 @@ struct ScrollViewDriver: UIViewRepresentable {
         func stopScrolling() {
             displayLink?.invalidate()
             displayLink = nil
-
-            // Signal scroll end — lets tab bar reappear
-            if let sv = scrollView {
-                originalDelegate?.scrollViewDidEndDragging?(sv, willDecelerate: false)
-                originalDelegate?.scrollViewDidEndDecelerating?(sv)
-            }
         }
 
         @objc private func tick(_ link: CADisplayLink) {