Release v2.20.4 (#313)

Patch release rounding up the three issues in the 2.20.4 milestone.

- An event opened from a reminder or a home-screen widget came back on every
  later launch — an error screen once that event had been deleted. Android
  hands back the intent that started the task each time the activity is
  rebuilt, and the event channels acted on it every time instead of once
  (#309).
- "Today" did nothing in the Agenda once you had scrolled ahead: the agenda is
  browsed by scrolling, not by moving its date, so resetting the date alone
  changed nothing. It now scrolls the list back, and the button stays offered
  while the list is scrolled away (#305).
- The self-hosted F-Droid repo filed the app under "Time" instead of
  "Calendar & Agenda" (#294).

Plus the release commit: CHANGELOG section, versionName 2.20.4 / versionCode
22004, and the en-US 22004 changelog. Merging this to main triggers the release
pipeline.

Closes #309
Closes #305
Closes #294

Co-authored-by: Jean-Luc Makiola <business@jeanlucmakiola.de>
Reviewed-on: https://codeberg.org/jlmakiola/calendula/pulls/313

CHANGELOG.md

@@ -5,6 +5,24 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [2.20.4] — 2026-09-20
+
+### Fixed
+- **The app no longer reopens the event you last came in on.** Opening an event
+  from a reminder or a home-screen widget made the app return to that same
+  event on every later launch — and show an error screen once the event had
+  been deleted. Android hands an app the launch it was started with again each
+  time it is rebuilt, and Calendula was acting on it every time instead of
+  once ([#309]).
+- **"Today" works in the agenda again.** Scrolling a few days ahead and tapping
+  today did nothing, because the agenda is browsed by scrolling rather than by
+  moving its date, and the button only moved the date. It now brings the list
+  back to today, and it stays offered while the list is scrolled away — before,
+  it was hidden in exactly the situation it is for ([#305]).
+- **Calendula is filed under "Calendar & Agenda" in the self-hosted repo.**
+  Browsing by category in an F-Droid client set to prefer that repo listed the
+  app under "Time" instead ([#294]).
+
 ## [2.20.3] — 2026-09-12
 
 ### Fixed
@@ -1693,3 +1711,6 @@ automatically, with zero telemetry and no internet permission.
 [#239]: https://codeberg.org/jlmakiola/calendula/issues/239
 [#297]: https://codeberg.org/jlmakiola/calendula/issues/297
 [#298]: https://codeberg.org/jlmakiola/calendula/issues/298
+[#309]: https://codeberg.org/jlmakiola/calendula/issues/309
+[#305]: https://codeberg.org/jlmakiola/calendula/issues/305
+[#294]: https://codeberg.org/jlmakiola/calendula/issues/294