fix: improve katex support

public/script/external/marked-katex-extension.umd.min.js

@@ -0,0 +1,8 @@
+/**
+ * Minified by jsDelivr using Terser v5.19.2.
+ * Original file: /npm/marked-katex-extension@5.0.1/lib/index.umd.js
+ *
+ * Do NOT use SRI with dynamically generated files! More information: https://www.jsdelivr.com/using-sri-with-dynamic-files
+ */
+!function(e,t){"object"==typeof exports&&"undefined"!=typeof module?module.exports=t(require("katex")):"function"==typeof define&&define.amd?define(["katex"],t):(e="undefined"!=typeof globalThis?globalThis:e||self).markedKatex=t(e.katex)}(this,(function(e){"use strict";const t=/^(\${1,2})(?!\$)((?:\\.|[^\\\n])*?(?:\\.|[^\\\n\$]))\1(?=[\s?!\.,:？！。，：]|$)/,n=/^(\${1,2})\n((?:\\[^]|[^\\])+?)\n\1(?:\n|$)/;function r(t,n){return r=>e.renderToString(r.text,{...t,displayMode:r.displayMode})+(n?"\n":"")}function i(e,n){return{name:"inlineKatex",level:"inline",start(e){let n,r=e;for(;r;){if(n=r.indexOf("$"),-1===n)return;if(0===n||" "===r.charAt(n-1)){if(r.substring(n).match(t))return n}r=r.substring(n+1).replace(/^\$+/,"")}},tokenizer(e,n){const r=e.match(t);if(r)return{type:"inlineKatex",raw:r[0],text:r[2].trim(),displayMode:2===r[1].length}},renderer:n}}function o(e,t){return{name:"blockKatex",level:"block",tokenizer(e,t){const r=e.match(n);if(r)return{type:"blockKatex",raw:r[0],text:r[2].trim(),displayMode:2===r[1].length}},renderer:t}}return function(e={}){return{extensions:[i(e,r(e,!1)),o(e,r(e,!0))]}}}));
+//# sourceMappingURL=/sm/25cb250346ed1262c6185eedae00cfd6f44bba21eb2c1bf521e994aa1d145555.map