Release v1.0.5 - Update release command to clean old zips

- Updated /release command to delete old zip files before creating new ones
- Ensures releases/ folder only contains the latest version

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

projects/chrome/public/manifest.json

@@ -2,7 +2,7 @@
   "manifest_version": 3,
   "name": "Plebeian Signer - Nostr Identity Manager & Signer",
   "description": "Manage and switch between multiple identities while interacting with Nostr apps",
-  "version": "1.0.4",
+  "version": "1.0.5",
   "homepage_url": "https://git.mleku.dev/mleku/plebeian-signer",
   "options_page": "options.html",
   "permissions": [