feat(web-ui): pause dashboard polling, sockets, and chart updates when the tab is hidden

ts_web/readme.md

@@ -111,7 +111,7 @@ ts_web/
 
 ### State Management
 
-The app uses `@push.rocks/smartstate` with multiple state parts:
+The app uses `@push.rocks/smartstate` v2.3+ with multiple state parts, scheduled actions with `autoPause: 'visibility'`, and batched updates:
 
 | State Part | Mode | Description |
 |-----------|------|-------------|
@@ -125,6 +125,16 @@ The app uses `@push.rocks/smartstate` with multiple state parts:
 | `certificateStatePart` | Soft | Certificate list, summary, loading state |
 | `remoteIngressStatePart` | Soft | Edge list, statuses, new edge secret |
 
+### Tab Visibility Optimization
+
+The dashboard automatically pauses all background activity when the browser tab is hidden and resumes when visible:
+
+- **Auto-refresh polling** uses `createScheduledAction` with `autoPause: 'visibility'` — stops HTTP requests while the tab is sleeping
+- **In-flight guard** prevents concurrent refresh requests from piling up
+- **WebSocket connection** disconnects when hidden and reconnects when visible, preventing log entry accumulation
+- **Network traffic timer** pauses chart updates when the tab is backgrounded
+- **Log entry batching** — incoming WebSocket log pushes are buffered and flushed once per animation frame to avoid per-entry re-renders
+
 ### Actions
 
 ```typescript