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/shell/index.tsx

@@ -54,7 +54,6 @@ const ShellInner = observer(() => {
           </Drawer>
         </ErrorBoundary>
       </View>
-      <ModalsContainer />
       <Lightbox />
       <Composer
         active={store.shell.isComposerActive}
@@ -64,6 +63,7 @@ const ShellInner = observer(() => {
         onPost={store.shell.composerOpts?.onPost}
         quote={store.shell.composerOpts?.quote}
       />
+      <ModalsContainer />
     </>
   )
 })