Revamp edit image alt text dialog (#5461)

* revamp alt dialog

* readd the limit check

don't trim with enforceLen, it ruins copy-pasting long text and it's overall annoying behavior

* Update src/view/com/composer/photos/ImageAltTextDialog.tsx

Co-authored-by: surfdude29 <149612116+surfdude29@users.noreply.github.com>

---------

Co-authored-by: surfdude29 <149612116+surfdude29@users.noreply.github.com>

src/state/modals/index.tsx

@@ -3,7 +3,6 @@ import {Image as RNImage} from 'react-native-image-crop-picker'
 import {AppBskyActorDefs, AppBskyGraphDefs} from '@atproto/api'
 
 import {useNonReactiveCallback} from '#/lib/hooks/useNonReactiveCallback'
-import {ComposerImage} from '../gallery'
 
 export interface EditProfileModal {
   name: 'edit-profile'
@@ -43,12 +42,6 @@ export interface CropImageModal {
   onSelect: (img?: RNImage) => void
 }
 
-export interface AltTextImageModal {
-  name: 'alt-text-image'
-  image: ComposerImage
-  onChange: (next: ComposerImage) => void
-}
-
 export interface DeleteAccountModal {
   name: 'delete-account'
 }
@@ -131,7 +124,6 @@ export type Modal =
   | ListAddRemoveUsersModal
 
   // Posts
-  | AltTextImageModal
   | CropImageModal
   | SelfLabelModal