feat(keyboard): add clipboard voice command mode

Long-press mic runs ASR as an instruction over eligible clipboard text,
with host-confirm recording UI, min-record gate, and light ASR prewarm.
Bump CURRENT_PROJECT_VERSION to 53.

OSGKeyboardShared/Models/FlowUtteranceMode.swift

@@ -0,0 +1,14 @@
+// FlowUtteranceMode.swift
+// OSGKeyboard · Shared
+//
+// Distinguishes dictation polish from clipboard-command generation on the
+// Flow command / result wire (plan §11).
+
+import Foundation
+
+public enum FlowUtteranceMode: String, Codable, Equatable, Sendable {
+    /// ASR is draft text to polish and insert (default / legacy).
+    case dictation
+    /// ASR is an instruction over a frozen clipboard snapshot.
+    case clipboardCommand
+}