chore(client)!: some MessageMedia fixes

breaking: `WebPage#type`: `web_page` -> `webpage` for consistency

packages/client/src/methods/messages/send-copy.ts

@@ -65,7 +65,7 @@ export async function sendCopy(
         throw new MtArgumentError("Service messages can't be copied")
     }
 
-    if (msg.media && msg.media.type !== 'web_page' && msg.media.type !== 'invoice') {
+    if (msg.media && msg.media.type !== 'webpage' && msg.media.type !== 'invoice') {
         let caption: InputText | undefined = params.caption
 
         if (!caption) {

packages/client/src/types/media/photo.ts

@@ -9,7 +9,7 @@ import { Thumbnail } from './thumbnail.js'
  * A photo
  */
 export class Photo extends FileLocation {
-    readonly type: 'photo'
+    readonly type = 'photo' as const
 
     /** Biggest available photo width */
     readonly width: number

packages/client/src/types/media/web-page.ts

@@ -17,7 +17,7 @@ import { Photo } from './photo.js'
  * of my own observations and experiments.
  */
 export class WebPage {
-    readonly type = 'web_page' as const
+    readonly type = 'webpage' as const
 
     constructor(readonly raw: tl.RawWebPage) {}