gitea: default repo setting; editor: asset picker with thumbnail grid

Gitea plugin: default_repo field per account (stored in DB, pre-fills
create issue form but stays editable). Editor toolbar: asset picker
flyout with 4-column thumbnail grid and live search filter. Clicking
a tile inserts the matching markdown.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

electron/package.json

@@ -1,6 +1,6 @@
 {
   "name": "hyprcrd",
-  "version": "1.1.0",
+  "version": "1.2.0",
   "description": "hyprcrd — self-hosted card manager",
   "main": "main.js",
   "scripts": {