Merge main; keep inline panels polling while their host reports them hidden

Main now has #1282, which pauses periodic layer polling in a hidden page
with its own catch-up and listener cleanup, so this PR drops its duplicate
lifecycle.js change and test in favor of main's.

Review fixes:
- data.js passes panelAwareVisibility(document) (new in app/embed.js) as
  the lifecycle's visibility target, so an inline panel whose host reports
  it hidden keeps polling. The HUD's 250 ms readout follows the same
  document.hidden && !isEmbeddedInline() rule as tools.js.
- Tests: embed.test.mjs (layers poll in an inline panel reported hidden,
  pause without the flag) and hudPageVisibility.test.mjs (HUD readout).
  Both use mock timers and clean up in finally.
- changelog.d/1344-inline-panel-visibility.md and a note in
  docs/CURRENT-STATE.md.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/app/data.js

@@ -1,6 +1,7 @@
 import { LayerLifecycle } from '../data/lifecycle.js';
 import { LayerPresentation } from './layerPresentation.js';
 import { createCyberSonarScene } from '../cyberSonarScene.js';
+import { panelAwareVisibility } from './embed.js';
 /** Register the application layer catalog before allowing state restoration. */
 export function createApplicationData({
   scene: { viewer, mapStackController },
@@ -13,16 +14,10 @@ export function createApplicationData({
   // Initialize data layer manager
   const dataManager = new LayerLifecycle(viewer, {
     allowQaRegistration,
+    // A panel's host may report it hidden while it is on screen; its layers
+    // keep polling (see keepPanelRendering in embed.js).
+    visibilityTarget: panelAwareVisibility(document),
     getSourceAvailability: catalog?.getSourceAvailability,
-    // Polled layers skip refreshes while the tab is hidden and catch up
-    // once when it is shown again.
-    pageVisibility: {
-      isHidden: () => document.visibilityState === 'hidden',
-      subscribe(callback) {
-        document.addEventListener('visibilitychange', callback);
-        return () => document.removeEventListener('visibilitychange', callback);
-      },
-    },
   });
   defer(async () => {
     await dataManager.destroyAll();