Add PremiumGate utility for generic freemium settings gating

- Add PremiumGate enum with get/canSet helpers for premium-gated settings
- Supports entirely premium settings (returns default for free users)
- Supports partial premium (only specific values require premium)
- Preserves stored values so re-subscribing restores previous choices

Sources/Bedrock/Premium/PremiumGate.swift

@@ -0,0 +1,108 @@
+//
+//  PremiumGate.swift
+//  Bedrock
+//
+//  Utility for premium-gating settings values in freemium apps.
+//  Provides a consistent pattern for handling premium vs free user access.
+//
+
+import Foundation
+
+/// Utility enum for premium-gating settings values.
+///
+/// Use this to create consistent premium/free behavior across your app's settings.
+/// Values are preserved in storage but defaults are returned for non-premium users,
+/// so users don't lose their settings if they unsubscribe and later re-subscribe.
+///
+/// ## Usage
+///
+/// For boolean settings that are entirely premium:
+/// ```swift
+/// var isSkinSmoothingEnabled: Bool {
+///     get { PremiumGate.get(cloudSync.data.isSkinSmoothingEnabled, default: false, isPremium: isPremiumUnlocked) }
+///     set { guard PremiumGate.canSet(isPremium: isPremiumUnlocked) else { return }
+///           updateSettings { $0.isSkinSmoothingEnabled = newValue }
+///     }
+/// }
+/// ```
+///
+/// For settings where only some values are premium:
+/// ```swift
+/// var selectedTimer: TimerOption {
+///     get {
+///         let stored = TimerOption(rawValue: cloudSync.data.selectedTimerRaw) ?? .three
+///         return PremiumGate.get(stored, default: .three, premiumValues: [.five, .ten], isPremium: isPremiumUnlocked)
+///     }
+///     set {
+///         guard PremiumGate.canSet(newValue, premiumValues: [.five, .ten], isPremium: isPremiumUnlocked) else { return }
+///         updateSettings { $0.selectedTimerRaw = newValue.rawValue }
+///     }
+/// }
+/// ```
+public enum PremiumGate {
+    
+    // MARK: - Getters
+    
+    /// Returns the stored value if premium, otherwise returns the default.
+    ///
+    /// Use for settings that are entirely premium-only (e.g., skin smoothing, mirror flip).
+    /// - Parameters:
+    ///   - stored: The value stored in settings
+    ///   - defaultValue: The value to return for non-premium users
+    ///   - isPremium: Whether the user has premium access
+    /// - Returns: The stored value if premium, otherwise the default
+    public static func get<T>(
+        _ stored: T,
+        default defaultValue: T,
+        isPremium: Bool
+    ) -> T {
+        isPremium ? stored : defaultValue
+    }
+    
+    /// Returns the stored value if premium or if it's not a premium value, otherwise returns the default.
+    ///
+    /// Use for settings where only some values are premium (e.g., timer options, quality levels).
+    /// - Parameters:
+    ///   - stored: The value stored in settings
+    ///   - defaultValue: The value to return for non-premium users when they have a premium value stored
+    ///   - premiumValues: The set of values that require premium access
+    ///   - isPremium: Whether the user has premium access
+    /// - Returns: The stored value if premium or not a premium value, otherwise the default
+    public static func get<T: Hashable>(
+        _ stored: T,
+        default defaultValue: T,
+        premiumValues: Set<T>,
+        isPremium: Bool
+    ) -> T {
+        if !isPremium && premiumValues.contains(stored) {
+            return defaultValue
+        }
+        return stored
+    }
+    
+    // MARK: - Setters
+    
+    /// Checks if setting any value should be allowed (for entirely premium settings).
+    ///
+    /// - Parameter isPremium: Whether the user has premium access
+    /// - Returns: True if the user can modify this setting
+    public static func canSet(isPremium: Bool) -> Bool {
+        isPremium
+    }
+    
+    /// Checks if setting a specific value should be allowed.
+    ///
+    /// Use for settings where only some values are premium.
+    /// - Parameters:
+    ///   - value: The value the user wants to set
+    ///   - premiumValues: The set of values that require premium access
+    ///   - isPremium: Whether the user has premium access
+    /// - Returns: True if the user can set this specific value
+    public static func canSet<T: Hashable>(
+        _ value: T,
+        premiumValues: Set<T>,
+        isPremium: Bool
+    ) -> Bool {
+        isPremium || !premiumValues.contains(value)
+    }
+}

Sources/Bedrock/Resources/Localizable.xcstrings

@@ -1 +1,10 @@
-{"sourceLanguage":"en","strings":{},"version":"1.0"}
+{
+  "sourceLanguage" : "en",
+  "strings" : {
+    "%lld%%" : {
+      "comment" : "A text label showing the current volume percentage. The argument is the volume as a percentage (0.0 to 1.0).",
+      "isCommentAutoGenerated" : true
+    }
+  },
+  "version" : "1.1"
+}