Restore circuit drag placement

docs/circuit-list-editor-interactions.md

@@ -83,6 +83,10 @@ Intent is separated by drag source type:
 - device row drag:
   - drop to existing circuit -> move row(s) into that circuit
   - drop to placeholder -> create new target circuit and move row(s)
+  - drop on the upper or lower edge of a circuit row -> create a new target
+    circuit directly before or after that circuit and move the row(s)
+  - the center of a circuit row remains the explicit target for adding the
+    row(s) to that existing circuit
   - crossing a section boundary requires explicit confirmation
   - phase type, category, linked project device and local row values remain unchanged
   - target creation, row assignments and reserve-state updates use one SQLite transaction
@@ -107,6 +111,8 @@ Cross-section device moves show confirmation-required feedback before drop. The
 
 - New groups are created manually in one of the three supported categories and
   receive the highest existing category group number plus one.
+- Group headings always show the stored editable display name; category labels
+  do not overwrite names of the default first groups.
 - Group reorder buttons move only relative to category peers and never change a
   group number or BMK.
 - `Gruppen-BMK neu nummerieren` is an explicit confirmed category-wide action.