Tidy: store never writes an undefined ghost; plant card toggle is the face, not the card

Co-Authored-By: Claude Fable 5 <[email protected]>

web/src/editor/store.ts

@@ -101,7 +101,8 @@ export const useEditorStore = create<EditorState>((set) => ({
   ...TRANSIENT,
   setSel: (sel) => set({ sel }),
   setFocus: (id) => set({ focusId: id }),
-  setArmedKind: (kind) => set({ armedKind: kind, ghost: kind ? undefined : null } as Partial<EditorState>),
+  // Disarming drops the ghost too; arming keeps whatever the cursor last set.
+  setArmedKind: (kind) => set((s) => ({ armedKind: kind, ghost: kind ? s.ghost : null })),
   setArmedPlant: (plant, lotId = null) => set({ armedPlant: plant, armedLotId: plant ? lotId : null }),
   setArmedLotId: (lotId) => set({ armedLotId: lotId }),
   setGhost: (ghost) => set({ ghost }),