Bump extension to 0.1.4

The manifest now declares a minimum Chrome version and requests the
`idle` permission, and the runtime gains the WebSocket heartbeat and
wake-driven reconnect. Publishing that update requires a new version.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/extension/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@browser-skill/extension",
-  "version": "0.1.3",
+  "version": "0.1.4",
   "private": true,
   "type": "module",
   "scripts": {