Anchor circle — pull zone floats above ring via overlay, no layout shift

Pull zone is now an .overlay(alignment: .top) offset upward by its own
height, so it appears above the ring without pushing it down. Removed the
ring's offset(y:) so it stays perfectly fixed while pulling.

Co-Authored-By: Kutesir <kutesir@provoc.ug>
Co-Authored-By: Sentry <sentry@provoc.ug>

Features/Backup/BackupView.swift

@@ -644,8 +644,6 @@ struct BackupView: View {
 
     private var circleSection: some View {
         VStack(spacing: 0) {
-            pullZone
-
             ZStack {
                 // Ripple expands outward on backup trigger
                 Circle()
@@ -657,8 +655,6 @@ struct BackupView: View {
 
                 ringHero
             }
-            .offset(y: min(pullProgress * 0.26, 14))
-            .animation(.spring(response: 0.38, dampingFraction: 0.8), value: pullProgress)
             .gesture(pullGesture)
             .padding(.bottom, 4)
 
@@ -670,6 +666,11 @@ struct BackupView: View {
                 .padding(.horizontal, AppTheme.hPad)
                 .padding(.bottom, 20)
         }
+        // Pull zone floats above the ring without affecting its layout position
+        .overlay(alignment: .top) {
+            pullZone
+                .offset(y: -max(0, pullProgress * 0.52))
+        }
     }
 
     private var pullZone: some View {