v1.1 polish: accessibility, error logging, localization, and code quality sweep

- Wrap 30+ production print() statements in #if DEBUG guards across 18 files
- Add VoiceOver labels, hints, and traits to Watch app, Live Activities, widgets
- Add .accessibilityAddTraits(.isButton) to 15+ onTapGesture views
- Add text alternatives for color-only indicators (progress dots, mood circles)
- Localize raw string literals in NoteEditorView, EntryDetailView, widgets
- Replace 25+ silent try? with do/catch + AppLogger error logging
- Replace hardcoded font sizes with semantic Dynamic Type fonts
- Fix FIXME in IconPickerView (log icon change errors)
- Extract magic animation delays to named constants across 8 files
- Add widget empty state "Log your first mood!" messaging
- Hide decorative images from VoiceOver, add labels to ColorPickers
- Remove stale TODO in Color+Codable (alpha change deferred for migration)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Shared/Views/CelebrationAnimations.swift

@@ -305,6 +305,12 @@ struct FlipRevealAnimation: View {
 struct ShatterReformAnimation: View {
     let mood: Mood
 
+    private enum AnimationConstants {
+        static let shatterPhaseDuration: TimeInterval = 0.6
+        static let checkmarkAppearDelay: TimeInterval = 1.1
+        static let fadeOutDelay: TimeInterval = 1.8
+    }
+
     @State private var shardOffsets: [CGSize] = []
     @State private var shardRotations: [Double] = []
     @State private var shardOpacities: [Double] = []
@@ -354,7 +360,7 @@ struct ShatterReformAnimation: View {
 
             // Phase 2: Converge to center and fade
             Task { @MainActor in
-                try? await Task.sleep(for: .seconds(0.6))
+                try? await Task.sleep(for: .seconds(AnimationConstants.shatterPhaseDuration))
                 phase = .reform
                 withAnimation(.easeInOut(duration: 0.5)) {
                     for i in 0..<shardCount {
@@ -367,7 +373,7 @@ struct ShatterReformAnimation: View {
 
             // Phase 3: Show checkmark
             Task { @MainActor in
-                try? await Task.sleep(for: .seconds(1.1))
+                try? await Task.sleep(for: .seconds(AnimationConstants.checkmarkAppearDelay))
                 withAnimation(.spring(response: 0.3, dampingFraction: 0.6)) {
                     checkmarkOpacity = 1
                 }
@@ -375,7 +381,7 @@ struct ShatterReformAnimation: View {
 
             // Phase 4: Fade out
             Task { @MainActor in
-                try? await Task.sleep(for: .seconds(1.8))
+                try? await Task.sleep(for: .seconds(AnimationConstants.fadeOutDelay))
                 withAnimation(.easeOut(duration: 0.3)) {
                     checkmarkOpacity = 0
                 }