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/UI/AccessibilityPhrases.swift

@@ -128,6 +128,16 @@ enum AccessibilityPhrases {
     /// the dim is the sighted signal, this is the other one.
     static let cutPending = "cut, pending paste"
 
+    /// **The attachment row that is the card's hero** (05-card-window.md ▸ Attachments; ruled
+    /// 2026-08-09) — carried as the row's *value*, beside its filename label.
+    ///
+    /// The same reasoning `cutPending` states one field over: a sighted user sees the banner on the
+    /// card face and knows which file made it, and without this the sidebar gives a VoiceOver user no
+    /// way to tell one of five images from the other four. It is also what makes the row's own
+    /// context menu legible — "Remove Hero" appearing on exactly one row is otherwise a menu that
+    /// changes for no announced reason.
+    static let heroAttachment = "hero image"
+
     /// A card element's value — the attachment count and the comment count when the card has either
     /// (design ruling 2026-08-09, card e729e30a — the comments chip's face value gains "N comments"
     /// beside the existing attachment wording), the cut-pending phrase when it is staged for paste,