Merge pull request 'fix: decode HTML entities in wikilinks before re-escaping' (#11) from dev into main

marked encodes " to " in text nodes, causing linkifyWikilinks to
double-escape it (& → &) so the visible link text showed "
instead of the actual character.

Decode marked's entities on the matched title/label before running
escapeHtmlAttr so the output is correct in both the href attribute
and the visible link text.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/utils/tags.ts

@@ -5,6 +5,17 @@ function escapeHtmlAttr(s: string): string {
   return s.replace(/&/g, "&amp;").replace(/"/g, "&quot;").replace(/</g, "&lt;").replace(/>/g, "&gt;");
 }
 
+// Decode HTML entities that marked introduces before we re-escape for our own output.
+// Order matters: &amp; must be last to avoid double-decoding.
+function decodeHtmlEntities(s: string): string {
+  return s
+    .replace(/&quot;/g, '"')
+    .replace(/&#39;/g, "'")
+    .replace(/&lt;/g, "<")
+    .replace(/&gt;/g, ">")
+    .replace(/&amp;/g, "&");
+}
+
 export function extractTags(body: string): string[] {
   const cleaned = body.replace(CODE_FENCE_RE, "");
   const tags = new Set<string>();
@@ -39,8 +50,8 @@ export function linkifyWikilinks(html: string): string {
     .map((part, i) => {
       if (i % 2 === 1) return part;
       return part.replace(WIKILINK_RE, (_full, title: string, display?: string) => {
-        const trimmed = title.trim();
+        const trimmed = decodeHtmlEntities(title.trim());
-        const label = display || trimmed;
+        const label = display ? decodeHtmlEntities(display) : trimmed;
         const encoded = encodeURIComponent(trimmed);
         return `<a class="wikilink" data-title="${escapeHtmlAttr(trimmed)}" href="/notes/by-title?title=${encoded}">${escapeHtmlAttr(label)}</a>`;
       });