chore: snapshot uncommitted local work before rebasing onto cloud-agent

Safety commit so the 94 uncommitted files in the working tree (in-flight
Account/Mac/Tip work plus the feature-preview recording tooling) survive the
move onto cursor/cloud-agent-1787824905651-vxuwc.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

OSGKeyboardHostSupport/Services/FlowContinuousCapture.swift

@@ -98,7 +98,11 @@ private final class FlowPrerollStore: @unchecked Sendable {
 }
 
 /// Rolling bar levels updated from the audio tap; read on the main actor.
-private final class FlowLevelStore: @unchecked Sendable {
+///
+/// Deliberately not `private`: the bar arithmetic runs on the realtime audio
+/// thread where a bad range is an uncatchable trap, so it needs direct
+/// `@testable` coverage rather than only being reachable through a live engine.
+final class FlowLevelStore: @unchecked Sendable {
     private let lock = OSAllocatedUnfairLock()
     private var levels: [Float]
 
@@ -115,7 +119,7 @@ private final class FlowLevelStore: @unchecked Sendable {
         lock.withLock { levels }
     }
 
-    private static func calculateLevels(from buffer: AVAudioPCMBuffer, barCount: Int) -> [Float] {
+    static func calculateLevels(from buffer: AVAudioPCMBuffer, barCount: Int) -> [Float] {
         guard let channelData = buffer.floatChannelData else {
             return Array(repeating: 0, count: barCount)
         }
@@ -127,7 +131,12 @@ private final class FlowLevelStore: @unchecked Sendable {
         var result = [Float]()
         result.reserveCapacity(barCount)
         for barIndex in 0..<barCount {
-            let start = barIndex * samplesPerBar
+            // A tap buffer shorter than `barCount` floors `samplesPerBar` to 1,
+            // so the tail bars would otherwise start past `frameLength` and
+            // build a reversed `start..<end` range — an uncatchable trap on the
+            // realtime audio thread. Clamping `start` leaves those bars empty
+            // (level 0), which is the right reading for samples we do not have.
+            let start = min(barIndex * samplesPerBar, frameLength)
             let end = min(start + samplesPerBar, frameLength)
             var sum: Float = 0
             for i in start..<end {

OSGKeyboardHostSupport/Services/Tip/TipPurchaseManager.swift

@@ -1,126 +0,0 @@
-// TipPurchaseManager.swift
-// OSGKeyboard · HostSupport
-//
-// Optional ¥30 consumable tip via StoreKit 2. Voluntary support only —
-// no feature gates, no App Group sync, no restore (Apple consumable rules).
-
-import Combine
-import Foundation
-import StoreKit
-#if canImport(OSGKeyboardShared)
-import OSGKeyboardShared
-#endif
-
-public enum TipPurchaseState: Equatable {
-    case idle
-    case loading
-    case purchasing
-    case succeeded
-    case failed(String)
-}
-
-@MainActor
-public final class TipPurchaseManager: ObservableObject {
-    public static let shared = TipPurchaseManager()
-
-    @Published public private(set) var product: Product?
-    @Published public private(set) var purchaseState: TipPurchaseState = .idle
-    @Published public private(set) var supportCount: Int
-
-    private var transactionUpdatesTask: Task<Void, Never>?
-
-    public init(defaults: UserDefaults = .standard) {
-        supportCount = defaults.integer(forKey: TipProduct.supportCountDefaultsKey)
-        transactionUpdatesTask = Task { [weak self] in
-            await self?.listenForTransactionUpdates()
-        }
-        Task { await loadProducts() }
-    }
-
-    deinit {
-        transactionUpdatesTask?.cancel()
-    }
-
-    /// Loads the tip product from the App Store / StoreKit Test configuration.
-    public func loadProducts() async {
-        guard purchaseState != .purchasing else { return }
-        purchaseState = .loading
-        do {
-            let products = try await Product.products(for: TipProduct.allProductIDs)
-            product = products.first(where: { $0.id == TipProduct.supportID })
-            purchaseState = product == nil
-                ? .failed(SharedL10n.string("tip.error.productUnavailable"))
-                : .idle
-        } catch {
-            product = nil
-            purchaseState = .failed(error.localizedDescription)
-        }
-    }
-
-    /// Starts the StoreKit purchase sheet for the support tip.
-    public func purchase() async {
-        guard let product else {
-            purchaseState = .failed(SharedL10n.string("tip.error.productUnavailable"))
-            return
-        }
-        purchaseState = .purchasing
-        do {
-            let result = try await product.purchase()
-            switch result {
-            case .success(let verification):
-                let transaction = try Self.verified(verification)
-                await handleCompletedTip(transaction)
-                purchaseState = .succeeded
-            case .userCancelled:
-                purchaseState = .idle
-            case .pending:
-                purchaseState = .failed(SharedL10n.string("tip.error.pending"))
-            @unknown default:
-                purchaseState = .failed(SharedL10n.string("tip.error.unknown"))
-            }
-        } catch {
-            purchaseState = .failed(error.localizedDescription)
-        }
-    }
-
-    /// Clears transient success / failure state after the UI acknowledges it.
-    public func acknowledgePurchaseState() {
-        switch purchaseState {
-        case .succeeded, .failed:
-            purchaseState = .idle
-        default:
-            break
-        }
-    }
-
-    private func listenForTransactionUpdates() async {
-        for await update in Transaction.updates {
-            guard let transaction = try? Self.verified(update),
-                  transaction.productID == TipProduct.supportID else { continue }
-            await handleCompletedTip(transaction)
-        }
-    }
-
-    private func handleCompletedTip(_ transaction: Transaction) async {
-        await transaction.finish()
-        recordSupportPurchase()
-    }
-
-    private func recordSupportPurchase() {
-        supportCount += 1
-        UserDefaults.standard.set(supportCount, forKey: TipProduct.supportCountDefaultsKey)
-    }
-
-    private static func verified<T>(_ result: VerificationResult<T>) throws -> T {
-        switch result {
-        case .verified(let value):
-            return value
-        case .unverified:
-            throw TipPurchaseError.failedVerification
-        }
-    }
-}
-
-private enum TipPurchaseError: Error {
-    case failedVerification
-}