Release v0.2.1

Bump version to 0.2.1 and publish signed installer + updated latest.json to
Gitea. Installed 0.2.0 clients will see the update banner.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

package.json

@@ -1,7 +1,7 @@
 {
   "name": "exbyte-depot",
   "private": true,
-  "version": "0.2.0",
+  "version": "0.2.1",
   "type": "module",
   "scripts": {
     "dev": "vite",