chore(deps): move implementation-detail deps from peer to regular

Tiptap, date-fns, react-day-picker, clsx, tailwind-merge, and
class-variance-authority are pure implementation details of MarkdownEditor,
Calendar, and the cn() utility. None of them leak into the public API or
the dist/*.d.ts type surface, so consumers do not need to install or
version-pin them.

Move them to regular dependencies so they install transitively. Keep
react, react-dom, @base-ui/react, radix-ui, and lucide-react as peer
dependencies — these have a Singleton constraint (React) or are used via
shared React Context (TooltipProvider via radix) where a version mismatch
would silently break consumers.

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

Author: hendrikebbers

package.json

@@ -39,24 +39,26 @@
     "typecheck": "tsc --noEmit",
     "prepublishOnly": "pnpm run build"
   },
-  "peerDependencies": {
-    "react": "^19.0.0",
-    "react-dom": "^19.0.0",
-    "@base-ui/react": "^1.3.0",
-    "radix-ui": "^1.4.0",
-    "lucide-react": "^0.500.0",
+  "dependencies": {
     "class-variance-authority": "^0.7.0",
     "clsx": "^2.1.0",
     "tailwind-merge": "^3.0.0",
-    "react-day-picker": "^9.14.0",
     "date-fns": "^4.1.0",
+    "react-day-picker": "^9.14.0",
     "@tiptap/core": "^3.22.0",
     "@tiptap/react": "^3.22.0",
     "@tiptap/starter-kit": "^3.22.0",
     "@tiptap/extension-link": "^3.22.0",
     "@tiptap/extension-placeholder": "^3.22.0",
     "tiptap-markdown": "^0.9.0"
   },
+  "peerDependencies": {
+    "react": "^19.0.0",
+    "react-dom": "^19.0.0",
+    "@base-ui/react": "^1.3.0",
+    "radix-ui": "^1.4.0",
+    "lucide-react": "^0.500.0"
+  },
   "devDependencies": {
     "@types/react": "^19.0.0",
     "@types/react-dom": "^19.0.0",
@@ -74,17 +76,6 @@
     "react-dom": "^19.0.0",
     "@base-ui/react": "^1.3.0",
     "radix-ui": "^1.4.0",
-    "lucide-react": "^0.500.0",
-    "class-variance-authority": "^0.7.0",
-    "clsx": "^2.1.0",
-    "tailwind-merge": "^3.0.0",
-    "react-day-picker": "^9.14.0",
-    "date-fns": "^4.1.0",
-    "@tiptap/core": "^3.22.0",
-    "@tiptap/react": "^3.22.0",
-    "@tiptap/starter-kit": "^3.22.0",
-    "@tiptap/extension-link": "^3.22.0",
-    "@tiptap/extension-placeholder": "^3.22.0",
-    "tiptap-markdown": "^0.9.0"
+    "lucide-react": "^0.500.0"
   }
 }