Fix plugin update bugs from Bugbot review

- Fix SSE error handler not calling onEvent, leaving UI stuck in updating state
- Fix plugin name prefix matching to avoid corrupting wrong config entries
- Fix EventSource cleanup on component unmount using useRef

dashboard/src/app/extensions/plugins/page.tsx

@@ -1,6 +1,6 @@
 'use client';
 
-import { useState, useMemo, useEffect } from 'react';
+import { useState, useMemo, useEffect, useRef } from 'react';
 import useSWR from 'swr';
 import { toast } from '@/components/toast';
 import { type Plugin, getInstalledPlugins, updatePlugin, type InstalledPluginInfo } from '@/lib/api';
@@ -585,6 +585,16 @@ function InstalledPluginsSection() {
 
   const [updating, setUpdating] = useState<string | null>(null);
   const [updateProgress, setUpdateProgress] = useState<string | null>(null);
+  const cleanupRef = useRef<(() => void) | null>(null);
+
+  // Cleanup EventSource on unmount
+  useEffect(() => {
+    return () => {
+      if (cleanupRef.current) {
+        cleanupRef.current();
+      }
+    };
+  }, []);
 
   const handleUpdate = (packageName: string) => {
     setUpdating(packageName);
@@ -597,16 +607,17 @@ function InstalledPluginsSection() {
         toast.success(event.message);
         setUpdating(null);
         setUpdateProgress(null);
+        cleanupRef.current = null;
         mutate(); // Refresh the list
       } else if (event.event_type === 'error') {
         toast.error(event.message);
         setUpdating(null);
         setUpdateProgress(null);
+        cleanupRef.current = null;
       }
     });
 
-    // Cleanup on unmount
-    return cleanup;
+    cleanupRef.current = cleanup;
   };
 
   if (isLoading) {

dashboard/src/lib/api.ts

@@ -1669,6 +1669,11 @@ export function updatePlugin(
 
   eventSource.onerror = () => {
     eventSource.close();
+    onEvent({
+      event_type: "error",
+      message: "Connection error: failed to connect to server",
+      progress: null,
+    });
   };
 
   return () => eventSource.close();

src/api/system.rs

@@ -1069,7 +1069,8 @@ fn stream_plugin_update(package: String) -> impl Stream<Item = Result<Event, std
                             // Update the plugin spec to @latest
                             for p in plugins.iter_mut() {
                                 if let Some(s) = p.as_str() {
-                                    if s.starts_with(&package) {
+                                    // Match exact package name or package@version to avoid prefix collisions
+                                    if s == package || s.starts_with(&format!("{}@", package)) {
                                         *p = serde_json::json!(format!("{}@latest", package));
                                     }
                                 }