Configure UI to be in compatibility mode

This temporarily addresses iOS 26 UI issues by setting a UI
configuration called "compatibility mode" until we implement full iOS 26
support.

See https://developer.apple.com/documentation/BundleResources/Information-Property-List/UIDesignRequiresCompatibility

Furthermore, it addresses one remaining UI issue with the timeline top
padding by altering the padding calculation for iOS 26 targets.

Changelog-None
Closes: https://github.com/damus-io/damus/issues/3283
Signed-off-by: Daniel D’Aquino <daniel@daquino.me>

damus/Features/Timeline/Views/TimelineView.swift

@@ -50,6 +50,15 @@ struct TimelineView<Content: View>: View {
         MainContent
     }
     
+    var topPadding: CGFloat {
+        if #available(iOS 26.0, *) {
+            headerHeight
+        }
+        else {
+            headerHeight - getSafeAreaTop()
+        }
+    }
+    
     var MainContent: some View {
         ScrollViewReader { scroller in
             ScrollView {
@@ -65,7 +74,7 @@ struct TimelineView<Content: View>: View {
                     .redacted(reason: loading ? .placeholder : [])
                     .shimmer(loading)
                     .disabled(loading)
-                    .padding(.top, headerHeight - getSafeAreaTop())
+                    .padding(.top, topPadding)
                     .offsetY { previous, current in
                         if previous > current{
                             if direction != .up && current < 0 {

damus/Info.plist

@@ -2,6 +2,8 @@
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
 <dict>
+	<key>UIDesignRequiresCompatibility</key>
+	<true/>
 	<key>NSUserActivityTypes</key>
 	<array>
 		<string>INSendMessageIntent</string>