Add routines module and full goal management

Routines: workout, meditation and must-do routines with timed, rep and
tick steps, sets and rest. A library screen, a builder with templates
and drag-to-reorder steps, and a full-screen player that auto-advances
timed phases, counts backgrounding and logs broken chains as partial.

Goals: a goal editor (deadline, colour, category, default class, archive),
routines linked to goals, and a goal field on tasks and routines. Tasks
added from inside a goal are now actually attached to it via parentId.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KhQh614DMeYoQEH9SoMRUw

frontend/lib/Grounded/see/goal/ConnectGoalDetail.dart

@@ -1,9 +1,13 @@
 import '../../about/external/data/Commitment.dart';
 import '../../about/external/data/Goal.dart';
+import '../../about/external/data/RoutineChain.dart';
 
 abstract class ConnectGoalDetail {
   void onGoalLoaded(Goal goal, List<Commitment> tasks);
 
+  /// The routines that serve this goal.
+  void onRoutinesLoaded(List<RoutineChain> routines);
+
   /// The task is ready to run — hand off to the full-screen runner.
   void onTaskReady(Commitment task);