Composer - replace threadgate modal with alf dialog (#4329)

* replace threadgate modal with alf dialog

* add accessibility to selectable

* add aria

* hide spinner once fetched

* add `hasOpenDialogs` value to context

* remove state

* Rm loading state

* Update the threadgate dialog button theming

* Factor out the threadgate editor and add editing to post views

* Mark messages for localization

* Use colors from mute dialog

* Remove unnecessary effect

* Reset state on dialog dismiss

* Clearer CTA

* Fix bugs

* Scope keyboard fix

* Rm getAreDialogsActive (no longer needed)

---------

Co-authored-by: Dan Abramov <dan.abramov@gmail.com>
Co-authored-by: Paul Frazee <pfrazee@gmail.com>

src/view/com/modals/Modal.web.tsx

@@ -23,7 +23,6 @@ import * as PostLanguagesSettingsModal from './lang-settings/PostLanguagesSettin
 import * as LinkWarningModal from './LinkWarning'
 import * as ListAddUserModal from './ListAddRemoveUsers'
 import * as SelfLabelModal from './SelfLabel'
-import * as ThreadgateModal from './Threadgate'
 import * as UserAddRemoveLists from './UserAddRemoveLists'
 import * as VerifyEmailModal from './VerifyEmail'
 
@@ -84,8 +83,6 @@ function Modal({modal}: {modal: ModalIface}) {
     element = <DeleteAccountModal.Component />
   } else if (modal.name === 'self-label') {
     element = <SelfLabelModal.Component {...modal} />
-  } else if (modal.name === 'threadgate') {
-    element = <ThreadgateModal.Component {...modal} />
   } else if (modal.name === 'change-handle') {
     element = <ChangeHandleModal.Component {...modal} />
   } else if (modal.name === 'invite-codes') {