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/Models/SyncedAppSettingsV2.swift

@@ -14,6 +14,10 @@ public struct SyncedAppSettingsV2: Codable, Equatable, Sendable {
     public var providerId: SyncedField<String>
     public var baseURL: SyncedField<String>
     public var model: SyncedField<String>
+    /// Cloud ASR provider — independent from polish `providerId`.
+    public var asrProviderId: SyncedField<String>
+    public var asrBaseURL: SyncedField<String>
+    public var asrModel: SyncedField<String>
     public var modeId: SyncedField<String>
     public var localeId: SyncedField<String>
     public var engineMode: SyncedField<String>
@@ -31,6 +35,9 @@ public struct SyncedAppSettingsV2: Codable, Equatable, Sendable {
         providerId: SyncedField<String>,
         baseURL: SyncedField<String>,
         model: SyncedField<String>,
+        asrProviderId: SyncedField<String>,
+        asrBaseURL: SyncedField<String>,
+        asrModel: SyncedField<String>,
         modeId: SyncedField<String>,
         localeId: SyncedField<String>,
         engineMode: SyncedField<String>,
@@ -47,6 +54,9 @@ public struct SyncedAppSettingsV2: Codable, Equatable, Sendable {
         self.providerId = providerId
         self.baseURL = baseURL
         self.model = model
+        self.asrProviderId = asrProviderId
+        self.asrBaseURL = asrBaseURL
+        self.asrModel = asrModel
         self.modeId = modeId
         self.localeId = localeId
         self.engineMode = engineMode
@@ -60,12 +70,88 @@ public struct SyncedAppSettingsV2: Codable, Equatable, Sendable {
         self.flowInactivityDuration = flowInactivityDuration
     }
 
+    private enum CodingKeys: String, CodingKey {
+        case schemaVersion
+        case providerId
+        case baseURL
+        case model
+        case asrProviderId
+        case asrBaseURL
+        case asrModel
+        case modeId
+        case localeId
+        case engineMode
+        case hasAcknowledgedCloudSharing
+        case uiLanguage
+        case translationTargetLocaleId
+        case handednessPreference
+        case cursorDragNavigationEnabled
+        case polishIntensity
+        case flowSkipAppSwitch
+        case flowInactivityDuration
+    }
+
+    public init(from decoder: Decoder) throws {
+        let container = try decoder.container(keyedBy: CodingKeys.self)
+        schemaVersion = try container.decode(Int.self, forKey: .schemaVersion)
+        providerId = try container.decode(SyncedField<String>.self, forKey: .providerId)
+        baseURL = try container.decode(SyncedField<String>.self, forKey: .baseURL)
+        model = try container.decode(SyncedField<String>.self, forKey: .model)
+        modeId = try container.decode(SyncedField<String>.self, forKey: .modeId)
+        localeId = try container.decode(SyncedField<String>.self, forKey: .localeId)
+        engineMode = try container.decode(SyncedField<String>.self, forKey: .engineMode)
+        hasAcknowledgedCloudSharing = try container.decode(SyncedField<Bool>.self, forKey: .hasAcknowledgedCloudSharing)
+        uiLanguage = try container.decode(SyncedField<AppUILanguage>.self, forKey: .uiLanguage)
+        translationTargetLocaleId = try container.decode(
+            SyncedField<String>.self,
+            forKey: .translationTargetLocaleId
+        )
+        handednessPreference = try container.decode(
+            SyncedField<HandednessPreference>.self,
+            forKey: .handednessPreference
+        )
+        cursorDragNavigationEnabled = try container.decode(
+            SyncedField<Bool>.self,
+            forKey: .cursorDragNavigationEnabled
+        )
+        polishIntensity = try container.decode(SyncedField<PolishIntensity>.self, forKey: .polishIntensity)
+        flowSkipAppSwitch = try container.decode(SyncedField<Bool>.self, forKey: .flowSkipAppSwitch)
+        flowInactivityDuration = try container.decode(
+            SyncedField<FlowInactivityDuration>.self,
+            forKey: .flowInactivityDuration
+        )
+
+        if let asrProvider = try container.decodeIfPresent(SyncedField<String>.self, forKey: .asrProviderId) {
+            asrProviderId = asrProvider
+        } else {
+            asrProviderId = providerId
+        }
+        if let asrURL = try container.decodeIfPresent(SyncedField<String>.self, forKey: .asrBaseURL) {
+            asrBaseURL = asrURL
+        } else {
+            asrBaseURL = baseURL
+        }
+        if let asrModelField = try container.decodeIfPresent(SyncedField<String>.self, forKey: .asrModel) {
+            asrModel = asrModelField
+        } else {
+            let fallbackModel = CloudASRModelCatalog.defaultModel(for: providerId.value)
+            asrModel = SyncedField(
+                value: fallbackModel,
+                updatedAt: model.updatedAt,
+                deviceID: model.deviceID
+            )
+        }
+    }
+
     /// Monotonic stamp used for `settingsCloudUpdatedAt` bookkeeping.
     public var latestUpdatedAt: Date {
         [
             providerId.updatedAt,
             baseURL.updatedAt,
             model.updatedAt,
+            asrProviderId.updatedAt,
+            asrBaseURL.updatedAt,
+            asrModel.updatedAt,
             modeId.updatedAt,
             localeId.updatedAt,
             engineMode.updatedAt,
@@ -99,6 +185,9 @@ public extension SyncedAppSettingsV2 {
             providerId: field(configuration.providerId),
             baseURL: field(configuration.baseURL),
             model: field(configuration.model),
+            asrProviderId: field(configuration.asrProviderId),
+            asrBaseURL: field(configuration.asrBaseURL),
+            asrModel: field(configuration.asrModel),
             modeId: field(configuration.modeId),
             localeId: field(configuration.localeId),
             engineMode: field(configuration.engineMode),
@@ -119,10 +208,14 @@ public extension SyncedAppSettingsV2 {
         func field<T>(_ value: T) -> SyncedField<T> {
             SyncedField(value: value, updatedAt: stamp, deviceID: deviceID)
         }
+        let provider = field(legacy.providerId)
         return SyncedAppSettingsV2(
-            providerId: field(legacy.providerId),
+            providerId: provider,
             baseURL: field(legacy.baseURL),
             model: field(legacy.model),
+            asrProviderId: provider,
+            asrBaseURL: field(legacy.baseURL),
+            asrModel: field(CloudASRModelCatalog.defaultModel(for: legacy.providerId)),
             modeId: field(legacy.modeId),
             localeId: field(legacy.localeId),
             engineMode: field(legacy.engineMode),
@@ -142,6 +235,9 @@ public extension SyncedAppSettingsV2 {
             providerId: .merge(local: local.providerId, remote: remote.providerId),
             baseURL: .merge(local: local.baseURL, remote: remote.baseURL),
             model: .merge(local: local.model, remote: remote.model),
+            asrProviderId: .merge(local: local.asrProviderId, remote: remote.asrProviderId),
+            asrBaseURL: .merge(local: local.asrBaseURL, remote: remote.asrBaseURL),
+            asrModel: .merge(local: local.asrModel, remote: remote.asrModel),
             modeId: .merge(local: local.modeId, remote: remote.modeId),
             localeId: .merge(local: local.localeId, remote: remote.localeId),
             engineMode: .merge(local: local.engineMode, remote: remote.engineMode),
@@ -172,6 +268,9 @@ public extension SyncedAppSettingsV2 {
         configuration.providerId = providerId.value
         configuration.baseURL = baseURL.value
         configuration.model = model.value
+        configuration.asrProviderId = asrProviderId.value
+        configuration.asrBaseURL = asrBaseURL.value
+        configuration.asrModel = asrModel.value
         configuration.modeId = modeId.value
         configuration.localeId = localeId.value
         configuration.engineMode = engineMode.value
@@ -195,6 +294,9 @@ public extension SyncedAppSettingsV2 {
         patch(&copy.providerId, value: configuration.providerId)
         patch(&copy.baseURL, value: configuration.baseURL)
         patch(&copy.model, value: configuration.model)
+        patch(&copy.asrProviderId, value: configuration.asrProviderId)
+        patch(&copy.asrBaseURL, value: configuration.asrBaseURL)
+        patch(&copy.asrModel, value: configuration.asrModel)
         patch(&copy.modeId, value: configuration.modeId)
         patch(&copy.localeId, value: configuration.localeId)
         patch(&copy.engineMode, value: configuration.engineMode)
@@ -221,6 +323,9 @@ public extension SyncedAppSettingsV2 {
         touch(&copy.providerId, value: configuration.providerId)
         touch(&copy.baseURL, value: configuration.baseURL)
         touch(&copy.model, value: configuration.model)
+        touch(&copy.asrProviderId, value: configuration.asrProviderId)
+        touch(&copy.asrBaseURL, value: configuration.asrBaseURL)
+        touch(&copy.asrModel, value: configuration.asrModel)
         touch(&copy.modeId, value: configuration.modeId)
         touch(&copy.localeId, value: configuration.localeId)
         touch(&copy.engineMode, value: configuration.engineMode)