refactor(js): improve robustness of line numbering and TOC anchoring

Author: xihale

assets/js/code-block.js

@@ -23,7 +23,7 @@ document.addEventListener('DOMContentLoaded', () => {
       });
     });
 
-    const codeLines = code.innerHTML.split(/\r?\n/);
+    const codeLines = code.textContent.split(/\r?\n/);
     const hasTrailingEmptyLine = codeLines.length > 0 && codeLines[codeLines.length - 1].trim() === '';
     if (hasTrailingEmptyLine) {
         codeLines.pop();

assets/js/toc.js

@@ -45,9 +45,7 @@ document.addEventListener('DOMContentLoaded', () => {
     if (currentId) {
       tocLinks.forEach(link => {
         link.classList.remove('active');
-        // Decode URI component to handle non-ASCII IDs if any
-        const href = link.getAttribute('href');
-        if (href === `#${currentId}`) {
+        if (link.hash === `#${currentId}`) {
           link.classList.add('active');
         }
       });