Forbid jQuery .css and refactor all usage (#29852)

Tested all functionality. There is a [pre-existing
bug](https://github.com/go-gitea/gitea/issues/29853) when moving a
project panels which is not caused by this refactoring.

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

web_src/js/features/colorpicker.js

@@ -1,10 +1,12 @@
-export async function createColorPicker($els) {
-  if (!$els || !$els.length) return;
+import $ from 'jquery';
+
+export async function createColorPicker(els) {
+  if (!els.length) return;
 
   await Promise.all([
     import(/* webpackChunkName: "minicolors" */'@claviska/jquery-minicolors'),
     import(/* webpackChunkName: "minicolors" */'@claviska/jquery-minicolors/jquery.minicolors.css'),
   ]);
 
-  $els.minicolors();
+  return $(els).minicolors();
 }