feat: Replace note content textarea with Tiptap rich text editor supporting markdown and slash commands.

k-notes-frontend/package.json

@@ -39,6 +39,12 @@
     "@radix-ui/react-tooltip": "^1.2.8",
     "@tailwindcss/vite": "^4.1.18",
     "@tanstack/react-query": "^5.90.12",
+    "@tiptap/extension-placeholder": "^3.14.0",
+    "@tiptap/extension-task-item": "^3.14.0",
+    "@tiptap/extension-task-list": "^3.14.0",
+    "@tiptap/react": "^3.14.0",
+    "@tiptap/starter-kit": "^3.14.0",
+    "@tiptap/suggestion": "^3.14.0",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
     "cmdk": "^1.1.1",
@@ -59,11 +65,14 @@
     "sonner": "^2.0.7",
     "tailwind-merge": "^3.4.0",
     "tailwindcss": "^4.1.18",
+    "tippy.js": "^6.3.7",
+    "tiptap-markdown": "^0.9.0",
     "vaul": "^1.1.2",
     "zod": "^4.2.1"
   },
   "devDependencies": {
     "@eslint/js": "^9.39.1",
+    "@tailwindcss/typography": "^0.5.19",
     "@tanstack/eslint-plugin-query": "^5.91.2",
     "@types/node": "^25.0.3",
     "@types/react": "^19.2.5",
@@ -74,6 +83,7 @@
     "eslint-plugin-react-hooks": "^7.0.1",
     "eslint-plugin-react-refresh": "^0.4.24",
     "globals": "^16.5.0",
+    "remark-gfm": "^4.0.1",
     "tw-animate-css": "^1.4.0",
     "typescript": "~5.9.3",
     "typescript-eslint": "^8.46.4",