fix: reconnect SSE immediately on OS wake-from-sleep (#1066)

* fix: reconnect SSE immediately on OS wake-from-sleep

When the desktop app resumes from OS sleep, TCP connections are dead
but timers were paused during sleep so the heartbeat watchdog doesn't
fire until ~30s after wake.

Add Electron powerMonitor.resume → renderer notification → event-pipeline
immediate abort, cutting reconnection delay from ~30s to ~0ms.

Changes:
- electron/main.mjs: import powerMonitor, emit openchamber:system-resume
  to all renderer windows on OS resume
- ui/sync/event-pipeline.ts: listen for openchamber:system-resume, set
  attemptAbortReason and abort the active SSE/WS attempt to trigger
  immediate reconnection with retryDelayMs=0 and lastEventId preservation

* fix: reconnect SSE immediately on OS wake-from-sleep

When the desktop app resumes from OS sleep, TCP connections are dead
but timers were paused during sleep so the heartbeat watchdog doesn't
fire until ~30s after wake.

Add Electron powerMonitor.resume → renderer notification → event-pipeline
immediate abort, cutting reconnection delay from ~30s to ~0ms.

Changes:
- electron/main.mjs: import powerMonitor, emit openchamber:system-resume
  to all renderer windows on OS resume
- ui/sync/event-pipeline.ts: listen for openchamber:system-resume via
  globalThis.window, set attemptAbortReason and abort the active SSE/WS
  attempt to trigger immediate reconnection with retryDelayMs=0 and
  lastEventId preservation
- Test: event-pipeline-resume.test.js verifies abort → reconnect flow

packages/ui/src/sync/event-pipeline.ts

@@ -152,6 +152,8 @@ type AttemptAbortReason =
   | "pipeline_stopped"
   | "ws_heartbeat_timeout"
   | "sse_heartbeat_timeout"
+  | "ws_system_resume"
+  | "sse_system_resume"
   | null
 
 export function createEventPipeline(input: EventPipelineInput) {
@@ -616,16 +618,33 @@ export function createEventPipeline(input: EventPipelineInput) {
     attempt?.abort()
   }
 
+  // OS wake-from-sleep (Electron powerMonitor.resume). The SSE connection
+  // is almost certainly dead after sleep — abort immediately so the
+  // reconnect loop fires on the next tick with retryDelayMs = 0.
+  const onSystemResume = () => {
+    attemptAbortReason = `${activeTransport}_system_resume`
+    attempt?.abort()
+  }
+
   if (typeof document !== "undefined") {
     document.addEventListener("visibilitychange", onVisibility)
     window.addEventListener("pageshow", onPageShow)
   }
 
+  // Use globalThis (not window) for the system-resume listener so that
+  // test environments can replace globalThis.window with a stub.
+  if (typeof globalThis.window !== "undefined") {
+    globalThis.window.addEventListener("openchamber:system-resume", onSystemResume)
+  }
+
   const cleanup = () => {
     if (typeof document !== "undefined") {
       document.removeEventListener("visibilitychange", onVisibility)
       window.removeEventListener("pageshow", onPageShow)
     }
+    if (typeof globalThis.window !== "undefined") {
+      globalThis.window.removeEventListener("openchamber:system-resume", onSystemResume)
+    }
     abort.abort()
     flushAll()
   }