Truncate gif alt text to 2000 symbols (#11488)

src/view/com/composer/GifAltText.tsx

@@ -10,6 +10,7 @@ import {
   type EmbedPlayerParams,
   parseEmbedPlayerFromUrl,
 } from '#/lib/strings/embed-player'
+import {enforceLen} from '#/lib/strings/helpers'
 import {useResolveGifQuery} from '#/state/queries/resolve-link'
 import {AltTextCounterWrapper} from '#/view/com/composer/AltTextCounterWrapper'
 import {atoms as a, useTheme} from '#/alf'
@@ -111,7 +112,7 @@ export function GifAltTextDialogLoaded({
       <Dialog.Outer
         control={control}
         onClose={() => {
-          onSubmit(altTextDraft)
+          onSubmit(enforceLen(altTextDraft, MAX_ALT_TEXT, true))
         }}
         nativeOptions={{fullHeight: true}}>
         <Dialog.Handle />