fix(ext): capitalize Relicario in Firefox manifest, bump to 0.2.0

The Chrome manifest was already updated; the Firefox manifest still
showed lowercase 'relicario' as the extension name and was pinned at
0.1.0.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

extension/manifest.firefox.json

@@ -1,7 +1,7 @@
 {
   "manifest_version": 3,
-  "name": "relicario",
-  "version": "0.1.0",
+  "name": "Relicario",
+  "version": "0.2.0",
   "description": "Two-factor encrypted password manager",
   "icons": {
     "16": "icons/icon-16.png",