chore(release): learn-v0.24.0

Build 27.

Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

apps/learn/halkyon_learn_flutter/assets/whats_new/0.24.0.de.txt

@@ -0,0 +1,6 @@
+- Sprachmodus: sprich mit dem Assistenten, hin und her.
+- + im Assistenten öffnet Kamera, Fotos und Dateien und zeigt, was mitgeht.
+- Das Feld des Assistenten reicht über den Bildschirm, seine Knöpfe bleiben, wo sie sind.
+- Ein Lernset wird unter Bearbeiten privat; das Schloss daneben zeigt es nur.
+- Erklärungen warten hinter einem Fragezeichen neben ihrem Titel.
+- Der Schlüssel für die Authenticator-App lässt sich kopieren, Codes haben sechs Ziffern.

apps/learn/halkyon_learn_flutter/assets/whats_new/0.24.0.en.txt

@@ -0,0 +1,6 @@
+- Voice mode: talk with the assistant, spoken back and forth.
+- + in the assistant opens Camera, Photos and Files, and shows what goes along.
+- The assistant's field spans the screen, its buttons stay put as who answers changes.
+- A studyset is made private in Edit; the lock beside it only shows it.
+- Explanations wait behind a question mark beside their title.
+- An authenticator's key can be copied, and its codes have six digits.

apps/learn/halkyon_learn_flutter/pubspec.yaml

@@ -15,7 +15,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 # In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
 # Read more about iOS versioning at
 # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
-version: 0.23.0+26
+version: 0.24.0+27
 
 environment:
   sdk: '^3.13.0'