fix: show moved account notice in hover card popup

- Add conditional logic to display moved account notice when account.moved is present
- Include link to new account with proper formatting
- Hide follow/unfollow buttons for moved accounts to prevent confusion
- Add localization key 'account.moved_to_short' for hover card context
- Style moved notice to match existing hover card design patterns

Fixes #35623

app/javascript/mastodon/components/hover_card_account.tsx

@@ -98,6 +98,20 @@ export const HoverCardAccount = forwardRef<
                 />
               )}
             </div>
+          ) : account.moved ? (
+            <div className='hover-card__moved-notice'>
+              <FormattedMessage
+                id='account.moved_to_short'
+                defaultMessage='This account has moved to {acct}'
+                values={{
+                  acct: (
+                    <Link to={`/@${account.moved.acct}`}>
+                      <strong>@{account.moved.acct}</strong>
+                    </Link>
+                  ),
+                }}
+              />
+            </div>
           ) : (
             <>
               <div className='hover-card__text-row'>

app/javascript/mastodon/locales/en.json

@@ -58,6 +58,7 @@
   "account.media": "Media",
   "account.mention": "Mention @{name}",
   "account.moved_to": "{name} has indicated that their new account is now:",
+  "account.moved_to_short": "This account has moved to {acct}",
   "account.mute": "Mute @{name}",
   "account.mute_notifications_short": "Mute notifications",
   "account.mute_short": "Mute",

app/javascript/styles/mastodon/components.scss

@@ -11027,6 +11027,23 @@ noscript {
     font-weight: 500;
   }
 
+  &__moved-notice {
+    text-align: center;
+    font-weight: 500;
+    color: $secondary-text-color;
+
+    a {
+      color: inherit;
+      text-decoration: underline;
+
+      &:hover,
+      &:focus,
+      &:active {
+        text-decoration: none;
+      }
+    }
+  }
+
   .display-name {
     font-size: 15px;
     line-height: 22px;