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/about/internal/application/RoutineKind.dart

@@ -0,0 +1,44 @@
+/// What a routine is for. The kind decides the runner's stage — a barbell
+/// clock for work, a breathing circle for stillness, a checklist for the
+/// things that simply have to get done.
+enum RoutineKind {
+  /// Sets, reps and rest. Timed work auto-advances into rest.
+  Workout,
+
+  /// Long timed holds with a breathing cue. No reps, rarely any rest.
+  Meditation,
+
+  /// An ordered list of tasks that have to be done, in order, every time.
+  MustDo,
+}
+
+String kindLabel(RoutineKind value) {
+  switch (value) {
+    case RoutineKind.Workout:
+      return "Workout";
+    case RoutineKind.Meditation:
+      return "Meditation";
+    case RoutineKind.MustDo:
+      return "Must-do";
+  }
+}
+
+String kindDescription(RoutineKind value) {
+  switch (value) {
+    case RoutineKind.Workout:
+      return "Sets, reps and timed rest.";
+    case RoutineKind.Meditation:
+      return "Timed sits with a breathing cue.";
+    case RoutineKind.MustDo:
+      return "Tasks, in order, every time.";
+  }
+}
+
+RoutineKind getRoutineKind(String? name) {
+  for (RoutineKind value in RoutineKind.values) {
+    if (value.name == name) {
+      return value;
+    }
+  }
+  return RoutineKind.Workout;
+}