Supply the offline canonical drawer context in memory proof

The first browser attempt captured useWebSocket outside its required provider. Supply only the disconnected synthetic alert transport used by the canonical drawer; retain the failure and keep production presentation and acceptance assertions unchanged.

Change-source: pulse-maintainer

frontend-modern/browser-tests/guest-memory-agent-stale.tsx

@@ -3,7 +3,7 @@
 import { createSignal, Show } from 'solid-js';
 import { render } from 'solid-js/web';
 import { Router, Route } from '@solidjs/router';
-import { DarkModeContext } from '../src/contexts/appRuntime';
+import { DarkModeContext, WebSocketContext, type WebSocketStore } from '../src/contexts/appRuntime';
 import { useWorkloads } from '../src/hooks/useWorkloads';
 import { mergeCanonicalResourceDeltaSnapshot } from '../src/utils/resourceStateAdapters';
 import { GuestRow } from '../src/components/Workloads/GuestRow';
@@ -51,6 +51,7 @@ const initial: Resource = {
 // Only the transport is synthetic; the canonical merger, mapper and mounted
 // presentation use production code. No websocket connection is attempted.
 window.__pulseWsStore = {
+  activeAlerts: {},
   state: { resources: [], activeAlerts: [], recentlyResolved: [] },
   connected: () => false,
   initialDataReceived: () => true,
@@ -197,7 +198,9 @@ render(
           <DarkModeContext.Provider
             value={() => document.documentElement.classList.contains('dark')}
           >
-            <Fixture />
+            <WebSocketContext.Provider value={window.__pulseWsStore as unknown as WebSocketStore}>
+              <Fixture />
+            </WebSocketContext.Provider>
           </DarkModeContext.Provider>
         )}
       />