[APP-1356] Policy update dialog (#8782)

* Add blocking announcement dialog feature

* WIP custom dialog

* Rework dialog and add native FocusScope

* Lock scroll on web, fix backdrop

* Add web FocusScope

* Create custom Outlet for these announcements

* Clean up FocusScope native impl

* Comments

* Some styling fixes

* Handle screen reader specifically

* Clean up state, remove Portal edits

* Reorg, rename

* Add syncing, tests

* Revert dialog updates

* Revert formatting

* Delete unused file

* Format

* Add FullWindowOverlay

* remove mmkv storage in debug btn

* Add debug code

* fix taps passing through on iOS

* Reorg

* Reorg, rename everything

* Complete policy update after signup

* Add logger

* Move context around, unmount portals on native

* Move a11y prop into FocusScope

* Remove useMemo

* Update dates

* Move debug to dev settings

* Unmount web portals until policy update completed

* UPdate dates

---------

Co-authored-by: Samuel Newman <mozzius@protonmail.com>

src/view/shell/createNativeStackNavigatorWithAuth.tsx

@@ -40,6 +40,7 @@ import {Onboarding} from '#/screens/Onboarding'
 import {SignupQueued} from '#/screens/SignupQueued'
 import {Takendown} from '#/screens/Takendown'
 import {atoms as a, useLayoutBreakpoints} from '#/alf'
+import {PolicyUpdateOverlay} from '#/components/PolicyUpdateOverlay'
 import {BottomBarWeb} from './bottom-bar/BottomBarWeb'
 import {DesktopLeftNav} from './desktop/LeftNav'
 import {DesktopRightNav} from './desktop/RightNav'
@@ -167,6 +168,9 @@ function NativeStackNavigator({
           {!isMobile && <DesktopRightNav routeName={activeRoute.name} />}
         </>
       )}
+
+      {/* Only shown after logged in and onboaring etc are complete */}
+      {hasSession && <PolicyUpdateOverlay />}
     </NavigationContent>
   )
 }