fix(editor): restore TWEET extension data when editing an echo

The edit-mode populate switch in TheEditor.vue handled MUSIC/VIDEO/
GITHUBPROJ/WEBSITE/LOCATION but was missing a TWEET case, so tweetToAdd
(url/username/statusId) was never restored. On submit, handleTweetExtension
re-parsed an empty url, failed, and dropped the extension — making a
tweet-only echo fail the empty check with "echo cannot be empty".

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: lin-snow

web/src/views/home/modules/TheEditor.vue

@@ -47,6 +47,7 @@ const {
   extensionToAdd,
   websiteToAdd,
   locationToAdd,
+  tweetToAdd,
   tagToAdd,
   currentExtensionType,
 } = storeToRefs(editorStore)
@@ -123,6 +124,16 @@ const fillEditorFromEchoToUpdate = () => {
             : ''
         break
       }
+      case ExtensionType.TWEET: {
+        const payload = echoToUpdate.value.extension.payload
+        tweetToAdd.value = {
+          url: payload.url || '',
+          username: payload.username || '',
+          statusId: payload.statusId || '',
+        }
+        extensionToAdd.value.extension = payload.url || ''
+        break
+      }
     }
   }