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')

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

@@ -1,16 +1,21 @@
-script.
-  (async () => {
-    const showKatex = () => {
-      document.querySelectorAll('#article-container .katex').forEach(el => el.classList.add('katex-show'))
-    }
-
-    if (!window.katex_js_css) {
-      window.katex_js_css = true
-      await btf.getCSS('!{url_for(theme.asset.katex)}')
-      if (!{theme.math.katex.copy_tex}) {
-        await btf.getScript('!{url_for(theme.asset.katex_copytex)}')
-      }
-    }
-
-    showKatex()
-  })()
+script.
+  (async () => {
+    const showKatex = () => {
+      document.querySelectorAll('#article-container .katex').forEach(el => el.classList.add('katex-show'))
+    }
+
+    if (!window.katex_js_css) {
+      window.katex_js_css = true
+      try {
+        await btf.getCSS('!{url_for(theme.asset.katex)}')
+        if (!{theme.math.katex.copy_tex}) {
+          await btf.getScript('!{url_for(theme.asset.katex_copytex)}')
+        }
+      } catch (e) {
+        console.error('[katex] failed to load assets, showing formulas anyway:', e)
+      }
+    }
+
+    showKatex()
+    btf.addGlobalFn('encrypt', showKatex, 'katex')
+  })()

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

@@ -77,5 +77,7 @@ script.
     }
 
     btf.addGlobalFn('encrypt', loadMathjax, 'mathjax')
-    window.pjax ? loadMathjax() : window.addEventListener('load', loadMathjax)
+    if (window.pjax) loadMathjax()
+    else if (document.readyState === 'loading') document.addEventListener('DOMContentLoaded', loadMathjax)
+    else loadMathjax()
   })()

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

@@ -282,12 +282,14 @@ script.
       const theme = document.documentElement.getAttribute('data-theme') === 'dark' ? '!{theme.mermaid.theme.dark}' : '!{theme.mermaid.theme.light}'
       ele.forEach((item, index) => {
         const mermaidSrc = item.firstElementChild
-        // Clean up event listeners before removing old SVG
+        // Clean up event listeners and stale content before re-rendering
         if (item.__mermaidAbortController) {
           item.__mermaidAbortController.abort()
         }
         const oldSvg = item.querySelector('svg')
         if (oldSvg) oldSvg.remove()
+        const oldError = item.querySelector('.mermaid-error')
+        if (oldError) oldError.remove()
         let config = {}
         try {
           config = mermaidSrc.dataset.config ? JSON.parse(mermaidSrc.dataset.config) : {}