feat(core): improve mobile perf (#15317)

#### PR Dependency Tree


* **PR #15317** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
* Virtualized mobile navigation with shell navigation and interactive
swipe menus; coordinated mobile back handling with interactive
phases/state restoration.
* Added shared auth request proxy and message-port based token handling
across mobile and worker flows.
* **Bug Fixes**
  * Hydrated remote worker error stacks for calls and observable errors.
* Improved SQLite FTS/indexer and nbstore optional text handling;
refined docs-search ref parsing and notification loading/retry.
* **Refactor / UX**
* Modal focus-preservation and pointer behavior updates; improved mobile
menu controls and back gesture plugins.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/frontend/component/src/ui/notification/mobile/notification-center.tsx

@@ -14,7 +14,7 @@ export function MobileNotificationCenter() {
       position="top-center"
       style={{
         width: '100%',
-        top: 'calc(env(safe-area-inset-top) + 16px)',
+        top: 'calc(var(--safe-area-inset-top, env(safe-area-inset-top, 0px)) + 16px)',
         pointerEvents: 'auto',
       }}
       theme={resolvedTheme}