Initial commit: Grounded Flutter frontend

A to-do app that doesn't believe you — an enforcement layer rather than a
neutral ledger.

Architecture ported from Autoreceptives/Frontend/Receptive: stacked MVVM with
the mandatory 4-file screen pattern, one ParentViewModel owning the loading /
network / error overlays and the handleError decision tree, one AppDataManager
gateway, dio comms carrying the three identity headers, secure storage with
random-suffixed keys, and a single-chokepoint Navigator. Package root and Dart
package name are both Grounded; org is nya.

The enforcement engine, one unit per formula in utils/:

- DebtEngine      w(class) x severity(d) x decay(t), sublinear severity so old
                  misses cannot swamp the score; abandonment 2x with 30-day
                  decay immunity; late complete retains 30%
- StandingEngine  Good -> Warned -> Grounded -> Lockdown, derived not set;
                  Grounded replaces home with the overdue queue
- CapacityEngine  blocks over-scheduling against p50 of historically completed
                  minutes, with a learned per-category estimation multiplier
- IntegrityEngine session integrity, weekly volume, plyometric contact ceiling
                  and enforced recovery gaps
- ExcuseAnalyser  on-device excuse clustering plus the confrontation copy
- GuardrailEngine distress detection and rationed amnesty
- ToneEngine      all enforcement copy, so the tone cap lives in one place

CommitmentEvent is append-only and is the source of truth rather than the
status field, which is what makes honest history and excuse analysis possible.

Goals contain commitments via parentId, and a task can be run from a
full-screen runner that derives elapsed time from wall-clock so screen-off
cannot lose time. Backgrounding pauses the clock and is counted. The runner is
mirrored into an ongoing notification, with alarm-class full-screen intents
reserved for non-negotiables.

Design language, fonts, icon and native splash are in place; Mason bricks are
retargeted to this project and verified end-to-end.

flutter analyze lib/ reports no errors.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Mfu2gQLSFN21YRBcU2NrTt

frontend/lib/Grounded/utils/CommonUtils.dart

@@ -0,0 +1,188 @@
+import 'package:flutter/material.dart';
+import 'package:intl/intl.dart';
+
+import '../about/external/data/Commitment.dart';
+import '../about/internal/application/CommitmentClass.dart';
+import '../about/internal/application/Standing.dart';
+import 'Colors.dart';
+
+/// Formatting and small shared derivations. Anything a screen would otherwise
+/// inline twice belongs here.
+
+/// "Mon 06:00–08:00" — the window, which is the whole point.
+String formatWindow(Commitment commitment) {
+  if (commitment.dueStart == null || commitment.dueEnd == null) {
+    return "No window set";
+  }
+
+  final DateFormat day = DateFormat('EEE');
+  final DateFormat time = DateFormat('HH:mm');
+
+  final String startDay = day.format(commitment.dueStart!);
+  final String startTime = time.format(commitment.dueStart!);
+  final String endTime = time.format(commitment.dueEnd!);
+
+  final bool sameDay = commitment.dueStart!.day == commitment.dueEnd!.day &&
+      commitment.dueStart!.month == commitment.dueEnd!.month;
+
+  if (sameDay) {
+    return "$startDay $startTime–$endTime";
+  }
+
+  return "$startDay $startTime – ${day.format(commitment.dueEnd!)} $endTime";
+}
+
+String formatDate(DateTime? value) {
+  if (value == null) {
+    return "";
+  }
+  return DateFormat('d MMM yyyy').format(value);
+}
+
+String formatDateTime(DateTime? value) {
+  if (value == null) {
+    return "";
+  }
+  return DateFormat('d MMM, HH:mm').format(value);
+}
+
+/// "3h 20m" from raw minutes.
+String formatMinutes(num minutes) {
+  final int total = minutes.round();
+  if (total < 60) {
+    return "${total}m";
+  }
+  final int hours = total ~/ 60;
+  final int remainder = total % 60;
+  if (remainder == 0) {
+    return "${hours}h";
+  }
+  return "${hours}h ${remainder}m";
+}
+
+/// "12:04" from raw seconds — for the proof timer and rest clocks.
+String formatClock(int seconds) {
+  final int safe = seconds < 0 ? 0 : seconds;
+  final int minutes = safe ~/ 60;
+  final int remainder = safe % 60;
+  return "${minutes.toString().padLeft(2, '0')}:${remainder.toString().padLeft(2, '0')}";
+}
+
+/// Debt is shown to one decimal — precise enough to move visibly when you
+/// clear something, coarse enough not to look like a lie.
+String formatDebt(double debt) {
+  return debt.toStringAsFixed(1);
+}
+
+/// "2 days overdue", "Due in 40m", "Window closes in 3h".
+String overdueLabel(Commitment commitment) {
+  if (commitment.dueEnd == null) {
+    return "";
+  }
+
+  final Duration difference = DateTime.now().difference(commitment.dueEnd!);
+
+  if (difference.isNegative) {
+    final Duration remaining = difference.abs();
+    if (remaining.inHours < 1) {
+      return "Closes in ${remaining.inMinutes}m";
+    }
+    if (remaining.inDays < 1) {
+      return "Closes in ${remaining.inHours}h";
+    }
+    return "Closes in ${remaining.inDays}d";
+  }
+
+  if (difference.inHours < 1) {
+    return "${difference.inMinutes}m overdue";
+  }
+  if (difference.inDays < 1) {
+    return "${difference.inHours}h overdue";
+  }
+  if (difference.inDays == 1) {
+    return "1 day overdue";
+  }
+  return "${difference.inDays} days overdue";
+}
+
+Color standingColor(Standing standing) {
+  switch (standing) {
+    case Standing.Good:
+      return colorStandingGood;
+    case Standing.Warned:
+      return colorStandingWarned;
+    case Standing.Grounded:
+      return colorStandingGrounded;
+    case Standing.Lockdown:
+      return colorStandingLockdown;
+  }
+}
+
+Color standingBackground(Standing standing) {
+  switch (standing) {
+    case Standing.Good:
+      return colorStandingGoodBg;
+    case Standing.Warned:
+      return colorStandingWarnedBg;
+    case Standing.Grounded:
+      return colorStandingGroundedBg;
+    case Standing.Lockdown:
+      return colorStandingLockdownBg;
+  }
+}
+
+Color classColor(CommitmentClass value) {
+  switch (value) {
+    case CommitmentClass.NonNegotiable:
+      return colorClassNonNegotiable;
+    case CommitmentClass.Standard:
+      return colorClassStandard;
+    case CommitmentClass.Elective:
+      return colorClassElective;
+  }
+}
+
+Color classBackground(CommitmentClass value) {
+  switch (value) {
+    case CommitmentClass.NonNegotiable:
+      return colorClassNonNegotiableBg;
+    case CommitmentClass.Standard:
+      return colorClassStandardBg;
+    case CommitmentClass.Elective:
+      return colorClassElectiveBg;
+  }
+}
+
+/// The weekday name for a 1..7 index.
+String weekdayName(int weekday) {
+  const List<String> names = <String>[
+    "Monday",
+    "Tuesday",
+    "Wednesday",
+    "Thursday",
+    "Friday",
+    "Saturday",
+    "Sunday",
+  ];
+  if (weekday < 1 || weekday > 7) {
+    return "";
+  }
+  return names[weekday - 1];
+}
+
+/// "7pm" for an hour-of-day index.
+String hourLabel(int hour) {
+  if (hour < 0) {
+    return "";
+  }
+  if (hour == 0) {
+    return "midnight";
+  }
+  if (hour < 12) {
+    return "${hour}am";
+  }
+  if (hour == 12) {
+    return "noon";
+  }
+  return "${hour - 12}pm";
+}