Add alt text support and rework image layout (#503)

* Add alt text support and rework image layout

* Add additional BottomSheet implementation to account for nested Composer modal

* Use mobile gallery layout on mobile web

* Missing key

* Fix lint

* Move altimage modal into the standard modal system

* Fix overflow wrapping of images

* Fixes to the alt-image modal

* Remove unnecessary switch

* Restore old imagelayoutgrid code

---------

Co-authored-by: Paul Frazee <pfrazee@gmail.com>

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

@@ -14,6 +14,7 @@ import * as ReportAccountModal from './ReportAccount'
 import * as DeleteAccountModal from './DeleteAccount'
 import * as RepostModal from './Repost'
 import * as CropImageModal from './crop-image/CropImage.web'
+import * as AltTextImageModal from './AltImage'
 import * as ChangeHandleModal from './ChangeHandle'
 import * as WaitlistModal from './Waitlist'
 import * as InviteCodesModal from './InviteCodes'
@@ -78,6 +79,8 @@ function Modal({modal}: {modal: ModalIface}) {
     element = <InviteCodesModal.Component />
   } else if (modal.name === 'content-filtering-settings') {
     element = <ContentFilteringSettingsModal.Component />
+  } else if (modal.name === 'alt-text-image') {
+    element = <AltTextImageModal.Component {...modal} />
   } else {
     return null
   }