fix: resolve tsdown + react-dom compatibility (#55)

tsdown 0.22 requires `unrun` as a dependency. react-dom needs to match
react 19.2.6.

Fixes CI failures caused by recent Dependabot merges.

Author: jpr5

package.json

@@ -63,9 +63,10 @@
     "@vscode/vsce": "^3.0.0",
     "jsdom": "^26.0.0",
     "react": "^19.2.6",
-    "react-dom": "^19.0.0",
+    "react-dom": "^19.2.6",
     "tsdown": "^0.22.0",
     "typescript": "~5.8.2",
+    "unrun": "^0.3.0",
     "vitest": "^3.1.1"
   },
   "contributes": {