scroll: more consistent scrolling behavior

Scrolling will always anchor the active note to the top of the screen

This is less confusing overall

Changelog-Changed: Clicking on a note will now always scroll it to the top
Signed-off-by: William Casarin <jb55@jb55.com>

damus/Components/EndBlock.swift

@@ -0,0 +1,32 @@
+//
+//  EndBlock.swift
+//  damus
+//
+//  Created by William Casarin on 2022-08-08.
+//
+
+import SwiftUI
+
+struct EndBlock: View {
+    let height: CGFloat
+    
+    init () {
+        self.height = 80.0
+    }
+    
+    init (height: Float) {
+        self.height = CGFloat(height)
+    }
+    
+    var body: some View {
+        Color.white.opacity(0)
+            .id("endblock")
+            .frame(height: height)
+    }
+}
+
+struct EndBlock_Previews: PreviewProvider {
+    static var previews: some View {
+        EndBlock()
+    }
+}