Move copy, paste and presets into the develop top bar

They sat in the develop column under a "SETTINGS" heading, which read as
application settings, and went away with the panel toggle and in the
mask and spot modes. The strip is where undo already is for the same
reason: these act on the whole edit, not on any one panel.

The paste button still names what it would apply. The TransferPanel
component is gone; the Transfer global and its Rust wiring are
unchanged.

ui/dr-ui/src/gesture_book.rs

@@ -67,15 +67,15 @@ pub const GESTURES: &[Gesture] = &[
     Gesture {
         title: "Copy the settings from this photograph",
         section: "Develop",
-        touch: "Press Copy in the Settings panel",
-        pointer: "Press Copy in the Settings panel",
+        touch: "Press Copy in the top bar",
+        pointer: "Press Copy in the top bar",
         keys: "Ctrl+C",
     },
     Gesture {
         title: "Paste the settings onto this photograph",
         section: "Develop",
-        touch: "Press Paste in the Settings panel",
-        pointer: "Press Paste in the Settings panel",
+        touch: "Press Paste in the top bar",
+        pointer: "Press Paste in the top bar",
         keys: "Ctrl+V",
     },
     Gesture {