feat(insights): first isights impemetation

test/fixtures/doubles/insights_doubles.dart

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+import 'dart:convert';
+import 'dart:io';
+
+import 'package:eatvio_app/features/insights/models/insights_payload_model.dart';
+import 'package:eatvio_app/features/insights/models/insights_period.dart';
+import 'package:eatvio_app/features/insights/repositories/insights_repository.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+InsightsPayloadModel loadInsightsPayloadFixture([String name = 'insights_payload.json']) {
+  final json = jsonDecode(File('test/fixtures/insights/$name').readAsStringSync()) as Map<String, dynamic>;
+  return InsightsPayloadModel.fromJson(json);
+}
+
+/// Подмена [InsightsRepository] для виджет-тестов: без сети, с журналом вызовов.
+class FakeInsightsRepository extends Fake implements InsightsRepository {
+  FakeInsightsRepository({InsightsPayloadModel? payload, this.error, this.heightCm = 176}) : payload = payload ?? loadInsightsPayloadFixture();
+
+  InsightsPayloadModel payload;
+
+  /// Если задан — выбрасывается из [getInsights] (например, [InsightsForbidden]).
+  Object? error;
+  int? heightCm;
+
+  final List<({String? slug, BodyPeriod period})> insightsRequests = [];
+  final List<double> addedWeights = [];
+  final List<({int chest, int waist, int hip})> addedCircumferences = [];
+
+  @override
+  Future<int?> getHeightCm({String? slug}) async => heightCm;
+
+  @override
+  Future<InsightsPayloadModel> getInsights({String? slug, required BodyPeriod bodyPeriod, int? heightCm}) async {
+    insightsRequests.add((slug: slug, period: bodyPeriod));
+    final failure = error;
+    if (failure != null) {
+      throw failure;
+    }
+    return payload;
+  }
+
+  @override
+  Future<void> addWeight({required double weight}) async {
+    addedWeights.add(weight);
+  }
+
+  @override
+  Future<void> addCircumference({
+    required int chestCircumference,
+    required int waistCircumference,
+    required int hipCircumference,
+  }) async {
+    addedCircumferences.add((chest: chestCircumference, waist: waistCircumference, hip: hipCircumference));
+  }
+}

test/fixtures/insights/insights_payload.json

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+{
+  "weight": {
+    "labels": ["01.11", "05.11", "09.11"],
+    "values": [74.5, 73.9, 73.2],
+    "last": 73.2,
+    "delta": -1.3,
+    "headline": "73.2",
+    "unit": "кг",
+    "deltaText": "Снизили на 1.3 кг за период"
+  },
+  "bmi": {
+    "labels": [],
+    "values": [],
+    "last": null,
+    "delta": null,
+    "headline": "—",
+    "category": null,
+    "deltaText": "Укажите рост, чтобы посчитать ИМТ.",
+    "hint": ""
+  },
+  "measure": {
+    "labels": ["01.11", "09.11"],
+    "waist": [82, 80.5],
+    "chest": [96, 96],
+    "hips": [101, 100],
+    "headline": "81",
+    "deltaText": "Талия меньше на 1.5 см за период"
+  },
+  "daily": {
+    "labels": ["03.11", "04.11", "05.11"],
+    "kcal": [1850, 2010, 1930],
+    "proteins": [92, 101, 96],
+    "fats": [60, 66, 63],
+    "carbs": [210, 222, 215],
+    "average": 1930,
+    "percent": 98,
+    "headline": "1930",
+    "deltaText": "98% от нормы"
+  },
+  "intra": {
+    "bars": [
+      {"x": 8.5, "p": 120, "f": 90, "c": 240},
+      {"x": 13, "p": 160, "f": 130, "c": 300}
+    ],
+    "satiety": [{"x": 8.5, "y": 3}, {"x": 13, "y": 4}],
+    "mood": [{"x": 8.5, "y": 4}],
+    "wake": 7.5,
+    "sleep": 23,
+    "wakeLabel": "07:30",
+    "sleepLabel": "23:00",
+    "wakeText": "Подъём в 07:30",
+    "sleepText": "Отход ко сну в 23:00",
+    "date": "2026-11-09",
+    "maxDate": "2026-11-09",
+    "dateLabel": "Сегодня",
+    "isToday": true
+  }
+}

test/fixtures/insights/insights_payload_minimal.json

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+{
+  "weight": {"labels": [], "values": [], "last": null, "delta": null, "headline": "—", "unit": "кг", "deltaText": "Недостаточно данных"},
+  "bmi": {"labels": [], "values": [], "headline": "—", "deltaText": "Укажите рост, чтобы посчитать ИМТ.", "hint": "Укажите рост, чтобы посчитать ИМТ."},
+  "measure": {"labels": [], "waist": [], "chest": [], "hips": [], "headline": "—", "deltaText": "Недостаточно данных"},
+  "daily": {"labels": [], "kcal": [], "proteins": [], "fats": [], "carbs": [], "average": null, "percent": null, "headline": "—", "deltaText": ""},
+  "intra": {"bars": [], "satiety": [], "mood": [], "wake": null, "sleep": null, "date": "2026-11-09", "maxDate": "2026-11-09", "dateLabel": "Сегодня", "isToday": true}
+}