Add gif support to web (#6433)

* add gif support to web

* rm set dimensions

* rm effect from preview

* rm log

* rm use of {cause: error}

* fix lint

src/view/com/composer/state/video.ts

@@ -36,12 +36,6 @@ export type VideoAction =
       signal: AbortSignal
     }
   | {type: 'update_progress'; progress: number; signal: AbortSignal}
-  | {
-      type: 'update_dimensions'
-      width: number
-      height: number
-      signal: AbortSignal
-    }
   | {
       type: 'update_alt_text'
       altText: string
@@ -185,13 +179,6 @@ export function videoReducer(
         progress: action.progress,
       }
     }
-  } else if (action.type === 'update_dimensions') {
-    if (state.asset) {
-      return {
-        ...state,
-        asset: {...state.asset, width: action.width, height: action.height},
-      }
-    }
   } else if (action.type === 'update_alt_text') {
     return {
       ...state,