fix(admin-invites): unify button height/size, fit-content width for create button

app/templates/admin_invites.html

@@ -37,7 +37,7 @@
             <input type="datetime-local" name="expires_at" class="aif-input">
         </div>
         <div class="aif-row">
-            <button type="submit" class="btn btn-primary">创建</button>
+            <button type="submit" class="btn btn-primary" style="width:fit-content">创建</button>
         </div>
     </form>
 </div>