Refactor hint.less to integrate tooltip styles and improve organization

- Merged tooltip styling sections into a cohesive structure.
- Added comments for clarity on tooltip components and their functionalities.
- Ensured consistent formatting and indentation throughout the file.
- Preserved original functionality while enhancing readability and maintainability.

packages/artplayer/src/style/hint.less

@@ -1,3 +1,4 @@
+.art-video-player {
     /*! Hint.css - v2.7.0 - 2021-10-01
     * https://kushagra.dev/lab/hint/
     * Copyright (c) 2021 Kushagra Gour */
@@ -810,3 +811,4 @@
     .hint--no-arrow:before {
         display: none;
     }
+}