feat: implement multi-step mood logging wizard

Adds sleep/energy/positivity/self-worth tracking columns to the database
(schema v2 migration), a new 5-option StepScale widget, per-answer chips
at the top of the screen, a 2×2 activity grid chip, and a full step-by-step
wizard flow: mood → sleep (first entry today only) → energy → positivity →
self-worth → activities → review+save.

lib/core/providers/mood_provider.dart

@@ -24,6 +24,12 @@ final dailyAveragesProvider = FutureProvider.autoDispose
       ref.watch(moodDaoProvider).getDailyAverages(range.start, range.end),
 );
 
+// ── Is this the first entry today? ───────────────────────────────────────────
+
+final isFirstEntryTodayProvider = FutureProvider.autoDispose<bool>((ref) async {
+  return !(await ref.read(moodDaoProvider).hasEntryToday());
+});
+
 // ── Selected day (drives calendar + day detail) ───────────────────────────────
 
 class SelectedDay extends Notifier<DateTime> {
@@ -55,6 +61,10 @@ class MoodEntryNotifier extends Notifier<AsyncValue<void>> {
     List<int> activityIds = const [],
     List<int> tagIds = const [],
     DateTime? timestamp,
+    int? sleepMinutes,
+    int? energyLevel,
+    int? positivityLevel,
+    int? selfWorthLevel,
   }) async {
     state = const AsyncLoading();
     final next = await AsyncValue.guard(() async {
@@ -64,6 +74,10 @@ class MoodEntryNotifier extends Notifier<AsyncValue<void>> {
           moodLevel: moodLevel,
           timestamp: timestamp ?? DateTime.now(),
           note: Value(note),
+          sleepMinutes: Value(sleepMinutes),
+          energyLevel: Value(energyLevel),
+          positivityLevel: Value(positivityLevel),
+          selfWorthLevel: Value(selfWorthLevel),
         ),
         activityIds: activityIds,
         tagIds: tagIds,