Remove the face carousel — one card presentation

03's resettlement reverses the pathfinder carry-over: the
selection-keyed dual presentation proved undesirable, so a card has one
presentation — selection changes styling, never geometry, and the
masonry never reflows on click. Deleted the carousel view (page dots,
glass underlay, scroll-tick monitor), the QuickLook thumbnail cache
(sole consumer), the pure paging/suppression rules, and the
sole-selected animation key — Motion now keys transactions on the
search query and the drop proposal only. The attachment chip stays as
the face's whole attachment story; viewing media is the card window's
job. No carousel state had leaked beyond the view layer.

Claude-Session: https://claude.ai/code/session_01SR4XGjmBE16ZUYWpfFHXwY

Kanban/Storage/BoardWriter.swift

@@ -1125,8 +1125,8 @@ public enum BoardWriter: Sendable {
     /// disturbs anything inside it, subfolders included.
     ///
     /// The listing itself is `BoardLoader.attachmentNames(in:)`, which is also what fills
-    /// `Card.attachments` for the board window's face indicator and carousel. **One function, so
-    /// the sidebar and the face can never disagree** about a card's attachments or their order.
+    /// `Card.attachments` for the board window's face indicator. **One function, so the sidebar
+    /// and the face can never disagree** about a card's attachments or their order.
     /// What this call adds over that one is the card-folder guard and this API's error
     /// vocabulary — the difference between a surface that *acts* on the files and two that
     /// merely show them.