feat(keyboard): add clipboard history and undo pastes

Ship optional keyboard clipboard history with settings, suggestion strip, and paste-permission guidance; let undo roll back clipboard inserts; bump build to 64.

OSGKeyboardShared/Services/SettingsDeepLink.swift

@@ -0,0 +1,34 @@
+// SettingsDeepLink.swift
+// OSGKeyboard · Shared
+//
+// One-shot deep-link target for the host Settings stack (keyboard → app).
+
+import Foundation
+
+public enum SettingsDeepLink: String, Sendable {
+    case clipboard
+
+    private static let pendingKey = "settings.pendingDeepLink"
+
+    public static func setPending(_ link: SettingsDeepLink?) {
+        guard let defaults = AppGroup.defaultsIfAvailable else { return }
+        if let link {
+            defaults.set(link.rawValue, forKey: pendingKey)
+        } else {
+            defaults.removeObject(forKey: pendingKey)
+        }
+        defaults.synchronize()
+    }
+
+    public static func consumePending() -> SettingsDeepLink? {
+        guard let defaults = AppGroup.defaultsIfAvailable else { return nil }
+        guard let raw = defaults.string(forKey: pendingKey) else { return nil }
+        defaults.removeObject(forKey: pendingKey)
+        defaults.synchronize()
+        return SettingsDeepLink(rawValue: raw)
+    }
+}
+
+public extension Notification.Name {
+    static let osgOpenSettingsDeepLink = Notification.Name("osg.OpenSettingsDeepLink")
+}