feat: add wordcount helpers, waline lightbox, and extensive bug fixes

- wordcount/min2read/totalcount built-in helpers (replaces hexo-wordcount)
- cloudTags random sort support
- waline lightbox via MutationObserver
- subtitle: seq guard prevents stale API response race
- newest-comments: escapeHtml XSS fix, unified fetchAndRender with cache fallback
- katex: try/catch asset load, encrypt re-render
- chartjs: destroy charts on pjax, fix theme property check
- mathjax: DOMContentLoaded instead of load
- mermaid: clean stale error elements
- medium-zoom: single instance, detach on pjax
- getScrollPercent: WeakMap cache with resize invalidation
- overflowPaddingR: avoid stale DOM refs
- readmode: dedupe button, pjax cleanup
- hexo-blog-decrypt: null-guard translateFn and encryptFn
- tw_cn: expand skipped translate tags
- localStorage: try/catch setItem
- cdn.js: fix [lib|dist]* character class regex bug
- findArchivesTitle: support custom archive_dir
- shuoshuoFN: guard moment.tz when timezone empty
- umami: no-store cache, error handling, path param
- artalk: vote config option
- bump version 5.7.1.260810

layout/includes/third-party/math/chartjs.pug

@@ -22,7 +22,7 @@ script.
         const value = obj[key]
         // If the property is an object and has theme-specific options, apply them
         if (typeof value === 'object' && value !== null) {
-          if (value[theme]) {
+          if (theme in value) {
             obj[key] = value[theme] // Apply the value for the current theme
           } else {
             // Recursively process child objects
@@ -32,6 +32,11 @@ script.
       })
     }
 
+    const destroyChart = canvas => {
+      const chart = canvas && window.Chart && Chart.getChart(canvas)
+      if (chart) chart.destroy()
+    }
+
     const runChartJS = ele => {
       window.loadChartJS = true
 
@@ -41,9 +46,10 @@ script.
         const width = item.getAttribute('data-width')
         const existingCanvas = document.getElementById(chartID)
 
-        // If a canvas already exists, remove it to avoid rendering duplicates
+        // If a canvas already exists, destroy its chart and remove it to avoid rendering duplicates
         if (existingCanvas) {
-            existingCanvas.parentNode.remove()
+          destroyChart(existingCanvas)
+          existingCanvas.parentNode.remove()
         }
 
         const chartDefinition = chartSrc.textContent
@@ -83,6 +89,11 @@ script.
       window.loadChartJS ? runChartJS(chartJSEle) : btf.getScript('!{url_for(theme.asset.chartjs)}').then(() => runChartJS(chartJSEle))
     }
 
+    // Destroy all charts before navigating away to avoid leaks
+    btf.addGlobalFn('pjaxSendOnce', () => {
+      document.querySelectorAll('.chartjs-wrap canvas').forEach(destroyChart)
+    }, 'chartjs')
+
     // Listen for theme change events
     btf.addGlobalFn('themeChange', loadChartJS, 'chartjs')
     btf.addGlobalFn('encrypt', loadChartJS, 'chartjs')