chore: bump version to 0.0.1 to match CHANGELOG

package.json was still at the copier-template default 0.1.0
while CHANGELOG and DEVELOPER.md document 0.0.1. pyproject.toml
sources the version from package.json via hatch-nodejs-version, so
no edit needed there.

Co-Authored-By: Claude <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
     "name": "snapshot",
-    "version": "0.1.0",
+    "version": "0.0.1",
     "description": "A JupyterLab extension.",
     "keywords": [
         "jupyter",