feat(train): a person's workouts opened with them (ADR 0030, D14, D15)

TrainPerson now opens the person's own sync database in their folder,
halkyon_app's SyncService behind AppCompatibility (the module's basics'
minimumAppBuild against the build package_info_plus reads), their key
and their workouts, and closes them in that order, the key last. As in
Learn, a person's data waits for the one before to close, since signing
in again opens the same database. The pubspec's dependencies are sorted
again (clock had gone before flutter).

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/train/halkyon_train_flutter/pubspec.yaml

@@ -13,10 +13,10 @@ environment:
 resolution: workspace
 
 dependencies:
-  flutter:
-    sdk: flutter
   clock: ^1.1.3
   equatable: ^3.0.0
+  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
@@ -38,6 +38,7 @@ dependencies:
   intl: ^0.20.3
   lucide_icons_flutter: ^3.1.20
   material_ui: ^1.5.0
+  package_info_plus: ^10.2.2
   path: ^1.9.1
   path_provider: ^2.1.6
   serverpod_auth_idp_flutter: 4.0.4