nook: decode hex apostrophe entities in release notes

Settings > Changelog and /changelog showed literal ' wherever a
bullet had an apostrophe: embed_release_notes.py escapes appcast
descriptions with Python's html.escape, which prefers the hex form for
apostrophes, and decodeEntities only knew the decimal ' — so the
entity survived into releases.json and was rendered as-is. Add '
(and ') to the replacement table.

Tests: new sectionsFromHtml case pinning html.escape-style output;
fails without the fix, full suite otherwise matches master.

Co-Authored-By: glm-5.3-flash <noreply@z.ai>
NOOK-565

src/routes/api/the-nook/_releases.ts

@@ -35,7 +35,11 @@ const ENTITY_REPLACEMENTS: [RegExp, string][] = [
   [/&lt;/g, "<"],
   [/&gt;/g, ">"],
   [/&quot;/g, '"'],
+  // Python's html.escape, which embed_release_notes.py writes the appcast
+  // with, prefers the hex form for apostrophes (NOOK-565).
+  [/&#x27;/g, "'"],
   [/&#39;/g, "'"],
+  [/&apos;/g, "'"],
   [/&nbsp;/g, " "],
   // Last, so "&amp;lt;" cannot decode twice.
   [/&amp;/g, "&"]