chore: release v5.5.3

- Bump version from 5.5.3-b2 to 5.5.3 in package.json
- Update third-party dependencies:
  * algolia_search: 5.43.0 -> 5.46.0
  * docsearch: 4.3.1 -> 4.3.2
  * fancybox: 6.1.4 -> 6.1.7
  * katex: 0.16.25 -> 0.16.27
  * mermaid: 11.12.1 -> 11.12.2
  * waline: 3.7.1 -> 3.8.0

perf: optimize JavaScript performance
- Add defer attribute to script tags in pjax and prismjs
- Improve DOM content loading timing in pjax
- Optimize utilities with better throttle implementation
- Cache header positions for TOC performance
- Optimize related posts generation with Maps
- Improve archive helpers performance

fix: improve error handling and UI fixes
- Replace process.exit with proper error throwing
- Fix tooltip positioning with boundary checks
- Add btn-effects to readmode exit button
- Fix element height calculation for hidden elements
- Improve image filters in dark mode (brightness .88, contrast .95)

style: code improvements and consistency
- Refactor random cover generation with generator pattern
- Optimize data processing in helpers
- Clean up unused functions and improve code structure
- Fix Chinese translation: 页 -> 頁

source/js/utils.js

@@ -14,37 +14,35 @@
       }
     },
 
-    throttle: function (func, wait, options = {}) {
-      let timeout, context, args
+    throttle: (func, wait, options = {}) => {
+      let timeout, args
       let previous = 0
 
       const later = () => {
         previous = options.leading === false ? 0 : new Date().getTime()
         timeout = null
-        func.apply(context, args)
-        if (!timeout) context = args = null
+        func(...args)
+        if (!timeout) args = null
       }
 
-      const throttled = (...params) => {
+      return (...params) => {
         const now = new Date().getTime()
         if (!previous && options.leading === false) previous = now
         const remaining = wait - (now - previous)
-        context = this
         args = params
+
         if (remaining <= 0 || remaining > wait) {
           if (timeout) {
             clearTimeout(timeout)
             timeout = null
           }
           previous = now
-          func.apply(context, args)
-          if (!timeout) context = args = null
+          func(...args)
+          if (!timeout) args = null
         } else if (!timeout && options.trailing !== false) {
           timeout = setTimeout(later, remaining)
         }
       }
-
-      return throttled
     },
 
     overflowPaddingR: {
@@ -169,17 +167,7 @@
 
     isHidden: ele => ele.offsetHeight === 0 && ele.offsetWidth === 0,
 
-    getEleTop: ele => {
-      let actualTop = ele.offsetTop
-      let current = ele.offsetParent
-
-      while (current !== null) {
-        actualTop += current.offsetTop
-        current = current.offsetParent
-      }
-
-      return actualTop
-    },
+    getEleTop: ele => ele.getBoundingClientRect().top + window.scrollY,
 
     loadLightbox: ele => {
       const service = GLOBAL_CONFIG.lightbox
@@ -190,7 +178,7 @@
       }
 
       if (service === 'fancybox') {
-        Array.from(ele).forEach(i => {
+        ele.forEach(i => {
           if (i.parentNode.tagName !== 'A') {
             const dataSrc = i.dataset.lazySrc || i.src
             const dataCaption = i.title || i.alt || ''