feat(editor): show fetching state of name auto complete

composables/masto.ts

@@ -48,6 +48,8 @@ export function getDisplayName(account?: Account, options?: { rich?: boolean })
 }
 
 export function getShortHandle({ acct }: Account) {
+  if (!acct)
+    return ''
   return `@${acct.includes('@') ? acct.split('@')[0] : acct}`
 }
 

composables/tiptap/suggestion.ts

@@ -58,8 +58,12 @@ function createSuggestionRenderer(): SuggestionOptions['render'] {
         })
       },
 
+      onBeforeUpdate(props) {
+        component.updateProps({ ...props, isPending: true })
+      },
+
       onUpdate(props) {
-        component.updateProps(props)
+        component.updateProps({ ...props, isPending: false })
 
         if (!props.clientRect)
           return