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/StepMode.dart

@@ -0,0 +1,31 @@
+/// How a single routine step is satisfied.
+enum StepMode {
+  /// A clock runs down and the step advances on its own.
+  Timed,
+
+  /// A rep target per set; the set ends when you say it does.
+  Reps,
+
+  /// A task. Ticked, not timed — the clock still records how long it took.
+  Check,
+}
+
+String stepModeLabel(StepMode value) {
+  switch (value) {
+    case StepMode.Timed:
+      return "Timed";
+    case StepMode.Reps:
+      return "Reps";
+    case StepMode.Check:
+      return "Tick";
+  }
+}
+
+StepMode getStepMode(String? name) {
+  for (StepMode value in StepMode.values) {
+    if (value.name == name) {
+      return value;
+    }
+  }
+  return StepMode.Timed;
+}