fix: SSE keepalive via plugin-kit 0.1.4 (v0.3.1)

Live-verified against a running host: status frames (including a syncing
transition) now stream through the plugin UI server. The previous keepalive
outlived Bun's default idle timeout, so an idle feed was closed before its
first ping.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

plugin/package.json

@@ -1,6 +1,6 @@
 {
 	"name": "@punktfunk/plugin-rom-manager",
-	"version": "0.3.0",
+	"version": "0.3.1",
 	"private": false,
 	"type": "module",
 	"description": "Punktfunk plugin: scans ROM directories, maps them to emulators, and reconciles them into the host game library as a provider — with a console-hosted web UI. The reference plugin built on @punktfunk/plugin-kit.",
@@ -42,7 +42,7 @@
 	},
 	"dependencies": {
 		"@punktfunk/host": "^0.1.2",
-		"@punktfunk/plugin-kit": "^0.1.3",
+		"@punktfunk/plugin-kit": "^0.1.4",
 		"effect": "^4.0.0-beta.99"
 	},
 	"devDependencies": {