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/JournalView.tsx

@@ -187,7 +187,7 @@ export const JournalView: React.FC<JournalViewProps> = ({
       </div>
 
       {showCalendar && (
-        <div className="lg:hidden shrink-0 px-4 py-3 border-b border-border bg-sidebar">
+        <div className="lg:hidden shrink-0 px-4 py-3 border-b border-border bg-sidebar animate-in fade-in slide-in-from-top-2 duration-200">
           <JournalCalendar
             activeDate={activeDate}
             entryDates={entryDates}