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/BoardLoader.swift

@@ -26,11 +26,10 @@ import os
 ///
 /// **The one read inside a card folder** is `attachmentNames(in:)`: a single flat listing of
 /// `attachments/`, feeding `Card.attachments`. It is a *names* read and nothing more — it never
-/// opens a file, never descends, never warns, and degrades to `[]` on any failure. Two board-
-/// window surfaces need it before a card window exists (the face's paperclip indicator and the
-/// sole-selected card's carousel — 03-board-ui.md § Card face), and the snapshot is where they
-/// read from. Everything else about a card folder's contents remains outside this loader's
-/// business.
+/// opens a file, never descends, never warns, and degrades to `[]` on any failure. The board
+/// window's face needs it before a card window exists (the quiet paperclip indicator —
+/// 03-board-ui.md § Card face), and the snapshot is where it reads from. Everything else about a
+/// card folder's contents remains outside this loader's business.
 ///
 /// Symlinks: a lane/card candidate that is itself a symlink is treated as a stray and never
 /// followed, whether it points to a file or a directory — this loader does not resolve
@@ -195,8 +194,8 @@ public enum BoardLoader: Sendable {
     /// stance the level walk takes).
     ///
     /// **Finder order** (`localizedStandardCompare`), so `"shot 2.png"` sorts before
-    /// `"shot 10.png"`: the order has to be stable across loads for the face carousel's pages and
-    /// its dots, and where it is already the sidebar's order it may as well be the same one.
+    /// `"shot 10.png"`: the order has to be stable across loads, and where it is already the
+    /// sidebar's order it may as well be the same one.
     ///
     /// Failure is silent: an unlistable directory yields `[]`. Fail-fast is reserved for
     /// structure (01-storage-format.md § Malformed input), and this field decorates a card — a