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/package.json

@@ -1,7 +1,7 @@
 {
   "name": "mindsift-frontend",
   "private": true,
-  "version": "0.12.2",
+  "version": "0.13.0",
   "license": "Unlicense",
   "type": "module",
   "scripts": {
@@ -37,6 +37,7 @@
     "jsdom": "^25.0.1",
     "postcss": "^8.4.49",
     "tailwindcss": "^3.4.17",
+    "tailwindcss-animate": "1.0.7",
     "typescript": "^5.6.3",
     "typescript-eslint": "8.18.2",
     "vite": "^5.4.11",