feat: add DailyStatusRepository for managing and persisting state

- Also add model for DailyStatus

lib/data_storage/daily_status_repository.dart

@@ -0,0 +1,51 @@
+import 'models/daily_entry_model.dart';
+
+class DailyStatusRepository {
+  DailyEntry? currentDay;
+
+  DailyStatusRepository();
+
+  void logFeelingMigrainy(bool status) {
+    if (currentDay == null) {
+      currentDay = DailyEntry(
+        date: getCurrentDate(),
+        feelingMigrainy: status,
+        tookZomig: false,
+        hadMigraine: false,
+        tookPainMeds: false);
+    } else {
+      currentDay = DailyEntry(
+        date: getCurrentDate(),
+        feelingMigrainy: status,
+        tookZomig: currentDay!.tookZomig,
+        hadMigraine: currentDay!.hadMigraine,
+        tookPainMeds: currentDay!.tookPainMeds
+      );
+    }
+  }
+
+  void logTookZomig(bool status) {
+    if (currentDay == null) {
+      currentDay = DailyEntry(
+          date: getCurrentDate(),
+          feelingMigrainy: false,
+          tookZomig: status,
+          hadMigraine: false,
+          tookPainMeds: false);
+    } else {
+      currentDay = DailyEntry(
+          date: getCurrentDate(),
+          feelingMigrainy: currentDay!.tookZomig,
+          tookZomig: status,
+          hadMigraine: currentDay!.hadMigraine,
+          tookPainMeds: currentDay!.tookPainMeds
+      );
+    }
+  }
+
+  DateTime getCurrentDate() {
+    DateTime now = DateTime.now();
+    DateTime date = DateTime(now.year, now.month, now.day);
+    return date;
+  }
+}

lib/data_storage/models/daily_entry_model.dart

@@ -0,0 +1,15 @@
+
+class DailyEntry {
+  final DateTime date;
+  final bool feelingMigrainy;
+  final bool tookZomig;
+  final bool hadMigraine;
+  final bool tookPainMeds;
+
+  const DailyEntry({
+    required this.date,
+    required this.feelingMigrainy,
+    required this.tookZomig,
+    required this.hadMigraine,
+    required this.tookPainMeds});
+}