style: update various code copy button and toc styles

- Removed the old copy-action SVG icon and replaced it with a new copy-button SVG icon.
- Added a new copy-success SVG icon for visual feedback on copy actions.
- Updated Waline component comments for clarity and improved code readability.
- Enhanced BackButton component with fallback navigation to homepage.
- Improved CodeCopyButton component by refining icon handling and timeout management.
- Adjusted GithubCard component's intersection observer root margin for better visibility.
- Updated GsapAnimation component variable names for consistency and clarity.
- Removed unnecessary styles from PhotoSwipe component.
- Modified TOC component styles for better spacing and layout.
- Updated multiple theme guide markdown files to correct image hosting URL comments.
- Cleaned up extend.css by removing commented-out styles and organizing code.
- Added PhotoSwipe background color and KaTeX overflow fixes to global.css.
- Enhanced markdown.css with video styling for better responsiveness.
- Improved transition.css comments for better understanding of GSAP animation states.

src/components/Comments/Waline.astro

@@ -10,8 +10,7 @@ const { waline: { serverURL = '', emoji = [], search = false, imageUploader = fa
   class="mt-16"
 ></div>
 
-<!-- >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> -->
-
+<!-- Waline Script >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> -->
 <script
   is:inline
   define:vars={{
@@ -37,8 +36,7 @@ function initWaline() {
   init({
     el: '#waline',
     serverURL,
-    // Share comments on posts in different languages
-    path: window.location.pathname.replace(/^\/([a-z]{2}(-[a-z]{2})?)\//, '/'),
+    path: window.location.pathname.replace(/^\/([a-z]{2}(-[a-z]{2})?)\//, '/'), // Share comments on posts in different languages
     lang: currentWalineLang,
     emoji,
     dark: 'html.dark',