chore(deps): drop stub @types/dompurify

dompurify ships its own types since v3.x — the @types package is an
empty stub. Removes it from both root and packages/ui devDependencies.

Credit to @av1155 who identified this in #726.

For provenance purposes, this commit was AI assisted.

Author: av1155

bun.lock

@@ -47,7 +47,6 @@
     "sonner": "^2.0.7"
   },
   "devDependencies": {
-    "@types/dompurify": "^3.2.0",
     "@types/node": "^25.5.2",
     "@types/turndown": "^5.0.6",
     "bun-types": "^1.3.11"

package.json

@@ -36,8 +36,7 @@
   },
   "devDependencies": {
     "@types/bun": "^1.2.0",
-    "@types/dompurify": "^3.0.5",
-    "@types/react": "^19.2.0",
+"@types/react": "^19.2.0",
     "@types/react-dom": "^19.2.0",
     "typescript": "~5.8.2"
   },