chore: release v0.4.0

Bump version from 0.3.2 to 0.4.0\n\nChanges:\n- feat: Add reliable startup toast notifications with delayed execution (#20)\n- chore: Add add-to-project workflow

Author: j4rviscmd

package.json

@@ -1,6 +1,6 @@
 {
   "name": "opencode-agent-modes",
-  "version": "0.3.2",
+  "version": "0.4.0",
   "description": "OpenCode plugin to switch agent modes between performance and economy presets",
   "module": "src/index.ts",
   "main": "dist/index.js",