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/Services/KeyboardTranslationConfigProtection.swift

@@ -0,0 +1,21 @@
+// KeyboardTranslationConfigProtection.swift
+// OSGKeyboard · Shared
+//
+// Chip-side translation writes need a short grace window so the keyboard's
+// 1 Hz App Group poll does not clobber the value before it lands.
+
+import Foundation
+
+public enum KeyboardTranslationConfigProtection {
+    /// Matches the historical 2.5 s grace used by `KeyboardConfigSync`.
+    public static let chipWriteGraceSeconds: TimeInterval = 2.5
+
+    public static func shouldProtect(until: Date?, now: Date = Date()) -> Bool {
+        guard let until else { return false }
+        return now < until
+    }
+
+    public static func protectionDeadline(now: Date = Date()) -> Date {
+        now.addingTimeInterval(chipWriteGraceSeconds)
+    }
+}