Redesign Day view with switchable voting layouts and modern styling

- Add 4 voting layout styles: horizontal, cards, radial, stacked
- Add color-filled backgrounds to mood entries (tinted by mood color)
- Add sticky month headers with blur material effect
- Add voting layout picker to Customize tab
- Add haptic feedback on mood selection
- Improve typography and spacing throughout

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Shared/Models/UserDefaultsStore.swift

@@ -7,6 +7,22 @@
 
 import Foundation
 
+enum VotingLayoutStyle: Int, CaseIterable {
+    case horizontal = 0   // Current: 5 buttons in a row
+    case cards = 1        // Larger tappable cards with labels
+    case radial = 2       // Semi-circle/wheel arrangement
+    case stacked = 3      // Full-width vertical list
+
+    var displayName: String {
+        switch self {
+        case .horizontal: return "Horizontal"
+        case .cards: return "Cards"
+        case .radial: return "Radial"
+        case .stacked: return "Stacked"
+        }
+    }
+}
+
 class UserDefaultsStore {
     enum Keys: String {
         case savedOnboardingData
@@ -28,6 +44,7 @@ class UserDefaultsStore {
         case firstLaunchDate
         case hasActiveSubscription
         case lastVotedDate
+        case votingLayoutStyle
 
         case contentViewCurrentSelectedHeaderViewBackDays
         case contentViewHeaderTag