refactor(snippets): adopt alias/title model and markdown UX

- rename snippet identity from name to alias and add required title fields

- migrate snippet API, forms, cards, and detail views to alias/title semantics

- render markdown descriptions with short card previews and split vendor chunks

client/package.json

@@ -22,7 +22,9 @@
     "react": "^19.1.0",
     "react-dom": "^19.1.0",
     "react-i18next": "^17.0.2",
+    "react-markdown": "^10.1.0",
     "react-router-dom": "^7.14.0",
+    "remark-gfm": "^4.0.1",
     "yaml": "^2.8.3"
   },
   "devDependencies": {