Fix search results not appearing (broken regex in template literal)

The highlight regex used \] and \/ inside a template literal which
dropped the backslashes in output, causing a JS SyntaxError that
silently killed the entire search script. Replaced with a simple
alphanumeric strip which avoids the escaping issue entirely.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: taylorarndt

html/search.html

@@ -140,7 +140,7 @@ <h1>Search</h1>
             // Highlight matching words in snippet
             words.forEach(function (w) {
               if (!w) return;
-              var escaped = w.replace(/[-[]/{}()*+?.\^$|]/g, '');
+              var escaped = w.replace(/[^a-zA-Z0-9]/g, '');
               if (!escaped) return;
               var re = new RegExp('(' + escaped + ')', 'gi');
               snippet = snippet.replace(re, '<mark>$1</mark>');

scripts/build-html.js

@@ -802,7 +802,7 @@ function buildSearchPage(outputDir) {
             // Highlight matching words in snippet
             words.forEach(function (w) {
               if (!w) return;
-              var escaped = w.replace(/[-[\]/{}()*+?.\\^$|]/g, '');
+              var escaped = w.replace(/[^a-zA-Z0-9]/g, '');
               if (!escaped) return;
               var re = new RegExp('(' + escaped + ')', 'gi');
               snippet = snippet.replace(re, '<mark>$1</mark>');