Add autosuggestions for hashtags (#11422)

app/javascript/styles/mastodon/components.scss

@@ -445,7 +445,8 @@
   }
 
   .autosuggest-account,
-  .autosuggest-emoji {
+  .autosuggest-emoji,
+  .autosuggest-hashtag {
     display: flex;
     flex-direction: row;
     align-items: center;
@@ -454,6 +455,14 @@
     font-size: 14px;
   }
 
+  .autosuggest-hashtag {
+    justify-content: space-between;
+
+    strong {
+      font-weight: 500;
+    }
+  }
+
   .autosuggest-account-icon,
   .autosuggest-emoji img {
     display: block;