feat: update version to 1.3.1, enhance GanttChart and MetricsPanel, and add ThreadMetricsChart

package.json

@@ -1,6 +1,6 @@
 {
   "name": "pss",
-  "version": "1.3.0",
+  "version": "1.3.1",
   "description": "Process Scheduler Simulator — an interactive educational tool that runs entirely in the browser",
   "main": "index.js",
   "scripts": {