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/ui/develop.slint

@@ -8,6 +8,8 @@
 // front of it.
 
 import { Theme } from "theme.slint";
+import { Develop } from "session.slint";
+import { Transfer } from "adjust.slint";
 import { Button, PanelHeading, Label, Value, Caption, Panel } from "widgets.slint";
 
 // Status strip — surfaces the GPU backend and adapter, which matters during
@@ -160,6 +162,42 @@ export component StatusBar inherits Rectangle {
             clicked => { root.redo(); }
         }
 
+        // TRACES: FR-DEV-6
+        // Copy and paste, in the strip beside undo for the reason undo is
+        // here: they act on the whole edit, not on any one panel, and the
+        // column can be put away. They sat in the column under a "SETTINGS"
+        // heading, which read as application settings and hid them behind a
+        // scroll and behind the panel toggle.
+        //
+        // The paste button names what would be pasted — "3 adjustments", and
+        // whether the crop is staying behind — because "Paste" alone asks the
+        // user to remember what they copied.
+        Button {
+            text: "Copy";
+            enabled: Develop.enabled;
+            y: (parent.height - self.height) / 2;
+            clicked => { Transfer.copy(); }
+        }
+
+        // Enabled on `armed` rather than on a non-empty summary, so pasting a
+        // neutral copy — which clears this image — stays available.
+        Button {
+            text: !Transfer.armed ? "Paste"
+                : "Paste " + Transfer.summary
+                    + (Transfer.framing-withheld ? ", no crop" : "");
+            enabled: Develop.enabled && Transfer.armed;
+            y: (parent.height - self.height) / 2;
+            clicked => { Transfer.paste(); }
+        }
+
+        // The saved half: this edit, kept under a name.
+        Button {
+            text: "Presets…";
+            enabled: Develop.enabled;
+            y: (parent.height - self.height) / 2;
+            clicked => { Transfer.open-presets(); }
+        }
+
         // Show or hide the develop column. On a tablet the panel is 280px of a
         // screen that is mostly photograph, and the whole point of opening an
         // image is to look at it — so being able to put the instruments away