feat(input-rich-text) : ajout d'un éditeur de texte riche basé sur TipTap v3

Composant MalioInputRichText aligné sur le thème Malio :
- TipTap v3.22.5 + StarterKit + Placeholder + tiptap-markdown 0.9.0
- Toolbar : gras, italique, barré, H2/H3, listes, citation, code, lien, undo/redo
- États error / success / hint, props disabled / readonly / editable
- Sortie configurable markdown (défaut) ou HTML via outputFormat
- Couleurs m-primary / m-danger / m-success / m-muted, icônes mdi:*
- Tests (12), playground page, story Histoire, MAJ CHANGELOG + COMPONENTS

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

package.json

@@ -42,7 +42,12 @@
   "dependencies": {
     "@nuxt/icon": "^2.2.1",
     "@nuxtjs/tailwindcss": "^6.14.0",
+    "@tiptap/extension-placeholder": "^3.22.5",
+    "@tiptap/pm": "^3.22.5",
+    "@tiptap/starter-kit": "^3.22.5",
+    "@tiptap/vue-3": "^3.22.5",
     "maska": "^3.2.0",
-    "tailwind-merge": "^3.3.1"
+    "tailwind-merge": "^3.3.1",
+    "tiptap-markdown": "^0.9.0"
   }
 }