build(learn): the F-Droid repository keeps the kingfisher as its icon

The repository is all of Halkyon's apps', so its icon stays Halkyon's
emblem (ADR 0031, D3), kept in tool/release/fdroid/ now that the snap's
icon is Learn's graduation cap. Learn's listing keeps the snap's.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

docs/adr/0031-the-apps-icons.md

@@ -42,7 +42,8 @@ through a colour between them (violet or sky) stays bright.
   the palette's (`#273EB2`); violet is no palette colour (between cobalt and strawberry);
   the others are halkyon_ui's palette's.
 - **D3 Learn's icon becomes the graduation cap; the kingfisher stays Halkyon's emblem**,
-  in the logo and the wordmark. Installed Learn apps change their icon once, when the new
+  in the logo and the wordmark, and as the icon of the F-Droid repository, which is all of
+  Halkyon's apps' (the developer's, 28 Oct: `tool/release/fdroid/halkyon.png`). Installed Learn apps change their icon once, when the new
   one is built, as do F-Droid's listing and the snap's.
 - **D4 Meditate's glyph is `circle-dot`** (the developer's, over `flower-2`, recommended,
   `wind`, `sprout`, `leaf` and `flower`): a point to rest the eyes on.

tool/fdroid_repo.sh

@@ -82,8 +82,8 @@ mkdir -p "$working/repo"
 cp -r tool/release/fdroid/. "$working/"
 # fdroid refuses a config.yml others can read.
 chmod 600 "$working/config.yml"
-cp snap/gui/halkyon-learn.png "$working/halkyon.png"
-# The app's own icon in the F-Droid app, the same: fdroid can't find the launcher
+# Learn's own icon in the F-Droid app, the snap's (the repository's is the
+# kingfisher, halkyon.png in tool/release/fdroid/): fdroid can't find the launcher
 # icon in a release APK, whose build shortens the resources' paths (res/9w.png
 # rather than res/mipmap-hdpi/ic_launcher.png; fdroidserver issue 885).
 mkdir -p "$working/metadata/app.halkyon.learn/en-US"

tool/release/fdroid/config.yml

@@ -12,7 +12,9 @@ repo_description: >-
 archive_name: Halkyon (archive)
 archive_description: >-
   Older versions of Halkyon's apps.
-# The snap's icon, which tool/fdroid_repo.sh copies beside this file.
+# The kingfisher, Halkyon's emblem, on a white tile with rounded corners (the snap's
+# icon until Learn's became the graduation cap, ADR 0031, D3): the repository is all
+# of Halkyon's apps', not Learn's.
 repo_icon: halkyon.png
 archive_icon: halkyon.png
 # The newest three versions of each app stay in the repository, older ones move