Fix 8 audit items: remove force-unwraps, improve accessibility and concurrency

- Replace force-unwrap HK types with modern HKQuantityType(_:) initializer
- Replace Calendar.date force-unwraps with guard/let in HealthService, HeaderPercView, MoodStreakActivity, DayViewViewModel, MonthTotalTemplate
- Extract DayViewViewModel.countEntries into testable static method with safe flatMap
- Replace DispatchQueue.main.asyncAfter with Task.sleep in CelebrationAnimations
- Add .minimumScaleFactor(0.5) to SmallRollUpHeaderView for Dynamic Type
- Add VoiceOver accessibility labels to HeaderPercView mood percentages
- Fix @testable import iFeel → Feels in Tests_iOS.swift
- Add 4 unit tests for countEntries (TDD)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Shared/Views/DayView/DayViewViewModel.swift

@@ -20,15 +20,12 @@ class DayViewViewModel: ObservableObject {
     }
 
     private var numberOfEntries: Int {
-        var num = 0
-        grouped.keys.forEach({
-            let year = grouped[$0]
-            let monthKeys = year?.keys
-            monthKeys?.forEach({
-                num += year![$0]!.count
-            })
-        })
-        return num
+        Self.countEntries(in: grouped)
+    }
+
+    /// Count total entries across all year/month groups. Extracted for testability.
+    static func countEntries(in grouped: [Int: [Int: [MoodEntryModel]]]) -> Int {
+        grouped.values.flatMap(\.values).reduce(0) { $0 + $1.count }
     }
 
     init(addMonthStartWeekdayPadding: Bool) {
@@ -90,8 +87,8 @@ class DayViewViewModel: ObservableObject {
         let forDate = entry.forDate
 
         let components = Calendar.current.dateComponents([.day, .month, .year], from: forDate)
-        let month = components.month!
-        let year = components.year!
+        let month = components.month ?? 1
+        let year = components.year ?? Calendar.current.component(.year, from: Date())
 
         let monthName = Random.monthName(fromMonthInt: month)
         let weekday = Random.weekdayName(fromDate: entry.forDate)