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/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')
+  })()