feat(ui): Terrakotta Nacht replaces Soft, smooth menus and sliding notes on phones

- dark counterpart of Terrakotta; Soft users move to it
- add tailwindcss-animate: the existing animate-in/fade/slide classes now
  run; menus zoom in, sheets slide up, notes slide in on phones
- no animations with reduced motion

chore(release): v0.13.0

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

frontend/src/features/workspace/DocumentEditor.tsx

@@ -941,7 +941,7 @@ export const DocumentEditor: React.FC<DocumentEditorProps> = ({
         {showActionsMenu && (
           <div
             role="menu"
-            className="absolute right-0 top-full mt-1.5 w-60 rounded-card bg-panel border border-border shadow-lg p-1 z-30 text-xs"
+            className="absolute right-0 top-full mt-1.5 w-60 rounded-card bg-panel border border-border shadow-lg p-1 z-30 text-xs origin-top-right animate-in fade-in zoom-in-95 slide-in-from-top-1 duration-150"
           >
             {!inTrash && (
               <button