Site 1.2.1: the 3-band waveform with rekordbox's real data on Upcoming

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tools/changelog.json

@@ -1,6 +1,13 @@
 {
   "_about": "The site's changelog, newest first. Versions follow Semantic Versioning (MAJOR.MINOR.PATCH), dates ISO 8601 (DIN EN 28601). make_builder_data.py adds every mod's current version from its module and writes assets/versions.js.",
   "site": [
+    {
+      "version": "1.2.1",
+      "date": "2026-10-20",
+      "changes": [
+        "Upcoming: the 3-band waveform now shows rekordbox's real 3-band data, in the overview too."
+      ]
+    },
     {
       "version": "1.2.0",
       "date": "2026-10-20",