A picture off the pasteboard becomes a card's file, its hero, or the board's backdrop

⌘V grows an image-data branch, below the app's own clipboard format and refused
outright while a file URL is on the pasteboard: a screenshot or a browser's Copy
Image lands as "Pasted Image.png" in the anchor card's attachments/, through the
very import path Finder file drops and ⇧⌘A take — one bracket, one Finder-style
collision ladder, one set of banners, and the same silence a drop's arrival has.
A card window's ⌘V pastes onto its own card; a focused text field still wins the
selector natively. A file-shaped flavor travels byte for byte, PNG preferred when
several are offered; TIFF and BMP are re-encoded to PNG, being interchange
encodings rather than files anyone wants in a folder.

The hero key gets the setter it was born owing: "Set as Hero" on any image row of
the attachment list, "Remove Hero" on the row that holds it, with menu-bar twins
so the context entry is nobody's only home. It writes as a restyle — one key, one
bracket, one invertible step on the window's own stack — and replaces rather than
refusing, because a card has one hero and the row that has it says Remove instead.

Edit ▸ Paste as Board Background is the same payload's other destination, taking
the existing background.image convention at its word: the picture into the board
folder as "Pasted Background.png", the colour subkey untouched, the generator's
overwrite-our-own-name rule inherited and its echo memo taught to tell the two
producers apart.

Claude-Session: https://claude.ai/code/session_014PtZdPwqZuqEDLc6wZMtEy

Kanban/KanbanApp.swift

@@ -219,6 +219,11 @@ struct KanbanApp: App {
             ShareBoardCommand(appModel: appModel)
             RevealInFinderCommand()
             AddAttachmentCommand()
+            // The attachment row's hero pair, as the menu-bar twins 11-command-nexus.md's
+            // context-menu contract requires ("no function's only home"). Two rows rather than one
+            // that renames itself, for titles-are-API's reason (`SetAsHeroCommand`).
+            SetAsHeroCommand()
+            RemoveHeroCommand()
             AddCommentCommand()
 
             Divider()
@@ -233,12 +238,22 @@ struct KanbanApp: App {
         // (`UndoCommands.swift`).
         UndoRedoCommands()
 
-        // The Edit menu: Find (⌘F), then its card-window stepping twins, placed after the standard
-        // Cut/Copy/Paste/Select All group, which is where macOS puts Find. The clipboard items above
-        // them stay the system's, answered by the board as a responder (`ClipboardCommands.swift`) —
-        // a second item sharing one of those titles is what titles-are-API forbids. Undo and Redo
-        // were the system's too until the latch (the group just above).
+        // The Edit menu: Paste as Board Background, then Find (⌘F) and its card-window stepping
+        // twins, placed after the standard Cut/Copy/Paste/Select All group, which is where macOS puts
+        // Find. The clipboard items above them stay the system's, answered by the board as a
+        // responder (`ClipboardCommands.swift`) — a second item sharing one of those titles is what
+        // titles-are-API forbids. Undo and Redo were the system's too until the latch (the group just
+        // above).
+        //
+        // **Paste as Board Background joined 2026-08-09** with the image-data paste branch: it sits
+        // directly under the system's Paste because it is the one paste this app has that ⌘V could
+        // not carry — a backdrop has no selection to target, so it needs a name rather than a
+        // modifier (`PasteBoardBackgroundCommand`). No default chord, like Welcome's row.
         CommandGroup(after: .pasteboard) {
+            PasteBoardBackgroundCommand(clipboard: appModel.clipboard)
+
+            Divider()
+
             FindCommand()
             FindSteppingCommands()
         }