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

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

src/view/com/composer/Composer.tsx

@@ -142,7 +142,7 @@ export const ComposePost = observer(function ComposePost({
         await apilib.post(store, {
           rawText: rt.text,
           replyTo: replyTo?.uri,
-          images: gallery.paths,
+          images: gallery.images,
           quote: quote,
           extLink: extLink,
           onStateChange: setProcessingState,