feat(todo): the app on halkyon_app, with its own icon

Todo's app is halkyon_app's instance and session gates with Todo's
frame ("Todo" under "Halkyon", its icon, its own sentences) and an
instance check accepting only `todo`; TodoDependencies on an instance,
an empty TodoPerson per person, nothing kept or synced yet. A person
sees an empty home and their account: whose it is on which instance,
switching account, signing out and deleting it (each asking first where
it deletes), and About with the source of what the instance runs and
the licence list. Texts in British English and German. App ID
app.halkyon.todo on every platform, GitHub's callback scheme registered
on Android, no web build.

Its icon is Lucide's list-checks (lucide-static 1.50.0) in the brand's
blues on white: tool/app_icons.py draws its strokes with Pillow and
writes every platform's launcher icon; Lucide's ISC notice joins the
licence list.

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

apps/todo/halkyon_todo_flutter/pubspec.yaml

@@ -1,21 +1,10 @@
 name: halkyon_todo_flutter
-description: A new Flutter project with Serverpod.
+description: Halkyon Todo, the app.
+publish_to: none
 
-# The following line prevents the package from being accidentally published to
-# pub.dev using `pub publish`. This is preferred for private packages.
-publish_to: 'none' # Remove this line if you wish to publish to pub.dev
-
-# The following defines the version and build number for your application.
-# A version number is three numbers separated by dots, like 1.2.43
-# followed by an optional build number separated by a +.
-# Both the version and the builder number may be overridden in flutter
-# build by specifying --build-name and --build-number, respectively.
-# In Android, build-name is used as versionName while build-number used as versionCode.
-# Read more about Android versioning at https://developer.android.com/studio/publish/versioning
-# 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: 1.0.0+1
+# <version>+<build>: the build rises with every release, and the instance asks apps below
+# its minimum build to update (halkyon_base's instance basics).
+version: 0.1.0+1
 
 environment:
   sdk: '^3.13.0'
@@ -24,64 +13,68 @@ environment:
 resolution: workspace
 
 dependencies:
-  # The following adds the Cupertino Icons font to your application.
-  # Use with the CupertinoIcons class for iOS style icons.
-  cupertino_icons: ^1.0.5
   flutter:
     sdk: flutter
+  flutter_bloc: ^9.1.1
+  # What every Halkyon app is built around (a shared package): the instances a
+  # device keeps accounts on, signing in through halkyon_base, each person's
+  # dependencies opened and closed, with texts of its own.
+  halkyon_app:
+    path: ../../../packages/halkyon_app
   halkyon_todo_client:
     path: ../halkyon_todo_client
+  # Halkyon's look, shared by its apps (a shared package): the theme, the bundled
+  # Noto Sans and the widgets every screen is built of.
+  halkyon_ui:
+    path: ../../../packages/halkyon_ui
+  # gen-l10n's output imports it.
+  intl: ^0.20.3
+  lucide_icons_flutter: ^3.1.20
+  material_ui: ^1.5.0
+  path: ^1.9.1
+  path_provider: ^2.1.6
   serverpod_auth_idp_flutter: 4.0.4
   serverpod_flutter: 4.0.4
 
 dev_dependencies:
-  # Used for agents to drive the app through the Dart MCP
   flutter_driver:
     sdk: flutter
-  flutter_lints: '>=3.0.0 <7.0.0'
+  # Writes the app's icons for every platform from assets/icon/halkyon_todo_icon.png,
+  # run through ../tool/app_icons.py (see the flutter_launcher_icons section below).
+  flutter_launcher_icons: ^0.14.4
   flutter_test:
     sdk: flutter
 
-# For information on the generic Dart part of this file, see the
-# following page: https://dart.dev/tools/pub/pubspec
-
-# The following section is specific to Flutter.
 flutter:
+  # Generates AppLocalizations from lib/l10n (see l10n.yaml).
+  generate: true
 
-  # The following line ensures that the Material Icons font is
-  # included with your application, so that you can use the icons in
-  # the material Icons class.
-  uses-material-design: true
-
-  # To add assets to your application, add an assets section, like this:
-  # assets:
-  #   - images/a_dot_burr.jpeg
-  #   - images/a_dot_ham.jpeg
-
-  # An image asset can refer to one or more resolution-specific "variants", see
-  # https://flutter.dev/assets-and-images/#resolution-aware.
-
-  # For details regarding adding assets from package dependencies, see
-  # https://flutter.dev/assets-and-images/#from-packages
   assets:
+    # The instance the build names, unless --dart-define=SERVER_URL=… does
+    # (serverpod_flutter's getServerUrl).
     - assets/config.json
+    # The app's icon, Lucide's list-checks in the brand's blues, and Lucide's
+    # licence for the licence list (../tool/app_icons.py writes both).
+    - assets/icon/halkyon_todo_icon.png
+    - assets/icon/LICENSE-lucide.txt
 
-  # To add custom fonts to your application, add a fonts section here,
-  # in this "flutter" section. Each entry in this list should have a
-  # "family" key with the font family name, and a "fonts" key with a
-  # list giving the asset and other descriptors for the font. For
-  # example:
-  # fonts:
-  #   - family: Schyler
-  #     fonts:
-  #       - asset: fonts/Schyler-Regular.ttf
-  #       - asset: fonts/Schyler-Italic.ttf
-  #         style: italic
-  #   - family: Trajan Pro
-  #     fonts:
-  #       - asset: fonts/TrajanPro.ttf
-  #       - asset: fonts/TrajanPro_Bold.ttf
-  #         weight: 700
-  #
-  # For details regarding fonts from package dependencies,
-  # see https://flutter.dev/custom-fonts/#from-packages
+# The app's icons, written by ../tool/app_icons.py: it prepares the rounded images in
+# build/icons/ first, then runs `dart run flutter_launcher_icons`, as Learn's does.
+# Android: the adaptive icon, on white, for the launcher to cut to its shape, and the
+# square one older Androids show. iOS: without its alpha channel, on white. macOS and
+# Windows: the rounded tile.
+flutter_launcher_icons:
+  image_path: "assets/icon/halkyon_todo_icon.png"
+  android: true
+  adaptive_icon_background: "#ffffff"
+  adaptive_icon_foreground: "assets/icon/halkyon_todo_icon.png"
+  ios: true
+  remove_alpha_ios: true
+  background_color_ios: "#ffffff"
+  macos:
+    generate: true
+    image_path: "build/icons/macos.png"
+  windows:
+    generate: true
+    image_path: "build/icons/rounded.png"
+    icon_size: 256