feat: harden Flow cold-start/force-quit and polish macOS dictation UX

Fix cold-start overlay recursion that overflowed the main-thread stack when
recording began while the ready overlay was still up; also remove temporary
on-screen Flow DEBUG panels after the orange-mic investigation, and land the
macOS overlay/catalog/layout polish plus related Flow recovery hardening.

OSGKeyboardShared/Core/Configuration/ConfigurationStore.swift

@@ -13,10 +13,18 @@ import Foundation
 /// Keep this protocol narrow: only what the shared pipeline needs today.
 /// Platform-specific settings UI and iCloud sync stay on concrete stores.
 public protocol ConfigurationStore: Sendable {
+    /// Polish / LLM provider id.
     var providerId: String { get }
     var baseURL: String { get }
     var apiKey: String { get }
     var model: String { get }
+
+    /// Cloud ASR provider id — independent from polish when `engineMode == "cloud"`.
+    var asrProviderId: String { get }
+    var asrBaseURL: String { get }
+    var asrApiKey: String { get }
+    var asrModel: String { get }
+
     var engineMode: String { get }
     var polishIntensity: PolishIntensity { get }
     var personalDictionary: PersonalDictionary { get }