Materialize the trash — store, undo, and the container universe

Phase 2 swaps every consumer: Liveness and its ancestor walk are gone,
replaced by ItemContainer — a UUID set plus the container side it
lives on, presence the whole test, one selection boundary instead of
the old liveness law. Deletion stages by place: board cards move to
the trash at a store-minted head rank, trash-side delete is permanent
behind its confirmation, Delete Immediately skips the trash from
anywhere, lane delete captures the subtree and removes the folder.
Restore has no method at all — moveCards resolves members in either
container, so drag-out and cut-paste are the ordinary moves 13 calls
them, registering ordinary Move steps. The delete inverse moves the
card back to its captured lane and rank; redo replays the captured
trash rank, a value the gesture actually wrote; lane undo recreates
the subtree byte-faithfully in session. Purges register nothing —
where 13's trash section contradicts its own Rules on that, Rules
wins, filed for ruling. Staleness collapsed to present-or-absent: a
container is a path, so a foreign restore fails the delete step's
expectation structurally. Legacy tombstones migrate on the loose-file
tail hook, cards oldest-first so minting above top reproduces the
retired newest-first column, lanes returning live, one folded loss
row naming both directions. Put Back, restoreByDrag,
receiveRestoredCards, TrashEntry, and the kind machinery are deleted;
the trash column renders the container correctly with its full face
rework left to phase 3.

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

Kanban/LiveStore/StyleModel.swift

@@ -154,7 +154,7 @@ public struct StyleEditorSession: Sendable, Equatable {
         case .board:
             return self
         case let .items(ids):
-            let live = ItemReferenceSet(ids: ids, liveness: .live).resolved(against: snapshot).ids
+            let live = ItemReferenceSet(ids: ids, container: .board).resolved(against: snapshot).ids
             guard !live.isEmpty else { return nil }
             return live == ids ? self : StyleEditorSession(target: .items(live))
         }
@@ -170,9 +170,9 @@ public struct StyleEditorSession: Sendable, Equatable {
     /// the popover lands on the first thing the user's eye would find.
     public func presentationAnchor(in snapshot: BoardModel) -> ItemID? {
         guard case let .items(ids) = target else { return nil }
-        for lane in snapshot.lanes where !lane.isDeleted {
+        for lane in snapshot.lanes {
             if ids.contains(lane.id) { return lane.id }
-            if let card = lane.cards.first(where: { !$0.isDeleted && ids.contains($0.id) }) { return card.id }
+            if let card = lane.cards.first(where: { ids.contains($0.id) }) { return card.id }
         }
         return nil
     }