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/apps/mobile-shared/src/nbstore/optional.spec.ts

@@ -0,0 +1,14 @@
+import { describe, expect, it } from 'vitest';
+
+import { normalizeNativeOptional } from './optional';
+
+describe('normalizeNativeOptional', () => {
+  it.each([
+    ['string', 'summary', 'summary'],
+    ['null', null, null],
+    ['missing key', undefined, null],
+    ['wrong type', 42, 42],
+  ])('normalizes %s', (_, input, expected) => {
+    expect(normalizeNativeOptional(input)).toBe(expected);
+  });
+});

packages/frontend/apps/mobile-shared/src/nbstore/optional.ts

@@ -0,0 +1,3 @@
+export function normalizeNativeOptional<T>(value: T | null | undefined) {
+  return value ?? null;
+}