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/ViewGoalEditor.dart

@@ -0,0 +1,44 @@
+import '../../about/external/initial/GoalRequest.dart';
+import '../../about/external/initial/IdRequest.dart';
+import '../parent/ParentViewModel.dart';
+import 'ConnectGoalEditor.dart';
+
+class ViewGoalEditor extends ParentViewModel {
+  ConnectGoalEditor connection;
+
+  ViewGoalEditor(super.context, this.connection);
+
+  void save(GoalRequest request) async {
+    if (!await hasNetwork(() => save(request))) return;
+
+    showLoading("Saving goal");
+
+    try {
+      await getDataManager().saveGoalEntry(request);
+
+      closeLoading();
+
+      connection.onSaved();
+    } catch (e) {
+      handleError(e, () => save(request), () => dismissError(), "Retry");
+    }
+  }
+
+  /// Archiving hides the goal; its tasks and their history stay exactly as
+  /// they were. Debt already accrued is not forgiven by archiving.
+  void archive(String goalId) async {
+    if (!await hasNetwork(() => archive(goalId))) return;
+
+    showLoading("Archiving");
+
+    try {
+      await getDataManager().archiveGoalEntry(IdRequest(id: goalId));
+
+      closeLoading();
+
+      connection.onArchived();
+    } catch (e) {
+      handleError(e, () => archive(goalId), () => dismissError(), "Retry");
+    }
+  }
+}