The card window's ⌘V drops its picture branch — the attachments header now offers one instead

Raw image data on a card window's ⌘V was a keyboard shortcut with no visible
trigger; the sidebar's Attachments header now grows a quiet control — beside
the existing add affordance, present only while the pasteboard holds a
picture this card could take — that pastes it through the exact seam the
retired branch used (ClipboardStore.pasteImage(intoCard:in:), the board's
"Paste Image into Card" row's own call). The file-URL branch stays on ⌘V; a
Finder copy is still unambiguous. CardBodyTextView's paste-yield mechanism
needed no change at all — it forwards by capability, not by picture-specific
logic, so a screenshot ⌘V with the body editor focused is now a genuine
no-op there, served by the new control instead.

The pasteboard's re-read gains a fourth checkpoint — a window becoming key —
alongside menu-tracking, ⌘-down and app activation: a persistent visible
control has to read true continuously while its window is frontmost, not
only at the instant a menu or chord probes it.

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

Kanban/UI/Board/CardFaceView.swift

@@ -766,8 +766,9 @@ struct CardFaceView: View, Equatable {
     /// card I right-clicked, regardless of the live selection") turns out to be what was wanted.
     ///
     /// **Paste Image into Card is genuinely per-card** — "into card" is the row's own wording, and it
-    /// is `ClipboardStore.pasteImage(intoCard:in:)`, the *same* method the card window's own ⌘V
-    /// already calls for its attachment branch. It always targets **this** card, never the widened
+    /// is `ClipboardStore.pasteImage(intoCard:in:)`, the *same* method the card window's own
+    /// attachments-header affordance calls for its picture (the ⌘V image branch it once rode retired
+    /// 2026-08-09 for that visible control). It always targets **this** card, never the widened
     /// selection: like Open, Rename and Style's anchor, "single-card by nature" — the existing
     /// precedent this SCOPE asks new rows to follow for such rows. "… more tbd" is left as the SCOPE
     /// asks: one row today, the submenu built to grow.