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.

docs/dev/ui-navigation.md

@@ -684,7 +684,8 @@ three columns of equal width side by side, each its own scroll:
    with them because it is not in their column.
 2. **Sliders** — `GroupStrip` above `AdjustPanel`, exactly as in the column.
    With a group selected this is one screen of sliders; with All it scrolls.
-3. **The mode's panels** — `ComposePanel` and `TransferPanel` in photo mode,
+3. **The mode's panels** — `ComposePanel` in photo mode (copy and paste
+   moved to the top bar, 2026-09-22),
    `SpotPanel` in repair, `MaskPanel` in local. Empty otherwise, which is
    a signal of its own about which mode the view is in (§1.1).