docs(changelog): note curated CalDAV colour picker (#22)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

CHANGELOG.md

@@ -24,6 +24,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   suggestions ([#18], [#20]).
 
 ### Fixed
+- A tidy colour picker on CalDAV calendars. For calendars synced by a CalDAV
+  app (such as DAVx5), the event colour picker showed every colour the account
+  publishes — nearly 150 swatches in alphabetical order, many of them
+  duplicates or near-identical shades. The picker now shows only visually
+  distinct colours, arranged as a rainbow with the grays at the end. Picked
+  colours still sync exactly as before, and calendars with hand-picked
+  palettes (like Google's) are unaffected. Thanks to @ptab for the report
+  ([#22]).
 - Month widget arrows and "today" button work again. On release builds the
   prev/next-month arrows and the jump-to-today control on the month widget did
   nothing when tapped — code shrinking had stripped the tap handlers behind
@@ -768,3 +776,4 @@ automatically, with zero telemetry and no internet permission.
 [#17]: https://codeberg.org/jlmakiola/calendula/issues/17
 [#18]: https://codeberg.org/jlmakiola/calendula/issues/18
 [#20]: https://codeberg.org/jlmakiola/calendula/issues/20
+[#22]: https://codeberg.org/jlmakiola/calendula/issues/22