feat(keyboard): improve typing, voice flow, and polish reliability

Reduce extension memory pressure and delivery races while adding richer candidates, tactile feedback, and safer two-level creative polishing.

OSGKeyboardShared/Models/KeyboardHapticIntensity.swift

@@ -0,0 +1,33 @@
+// KeyboardHapticIntensity.swift
+// OSGKeyboard · Shared
+//
+// Typing-key haptic strength: Off / Light (default, system-like) / Strong
+// (more mechanical). Persisted in App Group so the keyboard extension
+// mirrors the host Settings → General picker.
+
+import Foundation
+
+public enum KeyboardHapticIntensity: String, CaseIterable, Identifiable, Sendable, Codable {
+    case off
+    case light
+    case strong
+
+    public var id: String { rawValue }
+
+    public static let `default`: KeyboardHapticIntensity = .light
+
+    public var labelKey: String {
+        switch self {
+        case .off:    return "settings.keyboardHaptic.off"
+        case .light:  return "settings.keyboardHaptic.light"
+        case .strong: return "settings.keyboardHaptic.strong"
+        }
+    }
+
+    public static func fromStored(_ raw: String?) -> KeyboardHapticIntensity {
+        guard let raw, let value = KeyboardHapticIntensity(rawValue: raw) else {
+            return .default
+        }
+        return value
+    }
+}