fix(batch1): safe fixes — saveOffsets ordering, pid atomic, error handlers, go mutex, frontend cleanup

plugin/webapp/src/index.tsx

@@ -61,6 +61,13 @@ class LiveStatusPlugin {
 
       window.__livestatus_updates[data.post_id] = update;
 
+      // Evict completed sessions from the update cache after 60s to prevent unbounded growth
+      if (data.status === 'done' || data.status === 'error' || data.status === 'interrupted') {
+        setTimeout(() => {
+          delete window.__livestatus_updates[data.post_id];
+        }, 60000);
+      }
+
       // Notify post-specific listeners
       const listeners = window.__livestatus_listeners[data.post_id];
       if (listeners) {
@@ -82,7 +89,16 @@ class LiveStatusPlugin {
   }
 
   uninitialize(): void {
-    // Cleanup handled by Mattermost plugin framework
+    // Clear global listener and update stores to prevent accumulation across reloads
+    window.__livestatus_listeners = {};
+    window.__livestatus_updates = {};
+
+    // Unregister the custom post type component if it was registered
+    if (this.postTypeComponentId) {
+      // registry is not available here — Mattermost framework cleans up on deactivate.
+      // Clearing postTypeComponentId prevents stale references.
+      this.postTypeComponentId = null;
+    }
   }
 }