feat(offline): read-through cache for browse endpoints + offline badge

CachingOutlineAPIClient (OutlineKit) wraps LiveOutlineAPIClient at the
existing protocol boundary: always tries live, falls back to a SwiftData
key/value cache only on failure, and overwrites the cache on every live
success. Applies to the read/browse path only (collections, document
lists, document content) — search, writes, and sharing pass straight
through uncached. Wired in once at SessionStore.makeAPIClient, so no
view model needed to change. 5 new tests via a stub OutlineAPIClient
(43/43 passing).

NetworkMonitor (NWPathMonitor-backed, app target) is unrelated to the
cache's own fallback logic — it only drives a new sidebar OfflineBanner
so the user knows when they might be looking at stale content.

OutlineKit/Sources/OutlineKit/Caching/CachedPayload.swift

@@ -0,0 +1,18 @@
+import Foundation
+import SwiftData
+
+/// Generic key/value row backing `OfflineCacheStore` — one table for every
+/// cached response shape instead of a `@Model` per Outline type, so adding a
+/// new cached endpoint never needs a schema migration.
+@Model
+public final class CachedPayload {
+    @Attribute(.unique) public var key: String
+    public var payload: Data
+    public var cachedAt: Date
+
+    public init(key: String, payload: Data, cachedAt: Date) {
+        self.key = key
+        self.payload = payload
+        self.cachedAt = cachedAt
+    }
+}

OutlineKit/Sources/OutlineKit/Caching/CachingOutlineAPIClient.swift

@@ -0,0 +1,260 @@
+import Foundation
+
+/// Decorates `LiveOutlineAPIClient` (or any `OutlineAPIClient`) with a
+/// read-through cache for the handful of endpoints "browse the workspace
+/// offline" actually needs: the collection tree, document lists, and a
+/// document's own content. Every other call — search, writes, sharing,
+/// pins, etc. — passes straight through, since those either don't make
+/// sense offline or aren't worth the staleness risk.
+///
+/// Deliberately doesn't ask "are we online?" up front — that's a separate
+/// question from "did this specific request fail?", and checking first can
+/// be wrong the instant connectivity flaps. Instead: always try live, and
+/// fall back to the cache only on failure. A successful live response
+/// always overwrites the cache, so it can never get more stale than the
+/// last time this actually worked.
+public actor CachingOutlineAPIClient: OutlineAPIClient {
+    private let live: OutlineAPIClient
+    private let cache: OfflineCacheStore
+    private let encoder: JSONEncoder
+    private let decoder: JSONDecoder
+    private let keyEncoder: JSONEncoder
+
+    public init(live: OutlineAPIClient, cache: OfflineCacheStore) {
+        self.live = live
+        self.cache = cache
+
+        let encoder = JSONEncoder()
+        encoder.dateEncodingStrategy = .iso8601
+        self.encoder = encoder
+
+        let decoder = JSONDecoder()
+        decoder.dateDecodingStrategy = .iso8601
+        self.decoder = decoder
+
+        let keyEncoder = JSONEncoder()
+        keyEncoder.outputFormatting = .sortedKeys
+        self.keyEncoder = keyEncoder
+    }
+
+    // MARK: - Cached reads
+
+    public func documentInfo(id: String) async throws -> OutlineDocument {
+        try await cachedFetch(key: "document:\(id)") { try await self.live.documentInfo(id: id) }
+    }
+
+    public func listDocuments(
+        collectionId: String?,
+        parentDocumentId: String?,
+        offset: Int,
+        limit: Int
+    ) async throws -> [OutlineDocument] {
+        let key = "documents:\(collectionId ?? "-"):\(parentDocumentId ?? "-"):\(offset):\(limit)"
+        return try await cachedFetch(key: key) {
+            try await self.live.listDocuments(
+                collectionId: collectionId,
+                parentDocumentId: parentDocumentId,
+                offset: offset,
+                limit: limit
+            )
+        }
+    }
+
+    public func documentsList(_ request: DocumentsListRequest) async throws -> [OutlineDocument] {
+        try await cachedFetch(key: requestKey("documentsList", request)) { try await self.live.documentsList(request) }
+    }
+
+    public func listViewedDocuments(offset: Int, limit: Int) async throws -> [OutlineDocument] {
+        try await cachedFetch(key: "documentsViewed:\(offset):\(limit)") {
+            try await self.live.listViewedDocuments(offset: offset, limit: limit)
+        }
+    }
+
+    public func listCollections(offset: Int, limit: Int) async throws -> [OutlineCollection] {
+        try await cachedFetch(key: "collections:\(offset):\(limit)") {
+            try await self.live.listCollections(offset: offset, limit: limit)
+        }
+    }
+
+    public func collectionInfo(id: String) async throws -> OutlineCollection {
+        try await cachedFetch(key: "collection:\(id)") { try await self.live.collectionInfo(id: id) }
+    }
+
+    // MARK: - Pass-through
+
+    public func authInfo() async throws -> OutlineAuthInfo {
+        try await live.authInfo()
+    }
+
+    public func searchDocuments(_ request: DocumentSearchRequest) async throws -> [OutlineDocumentSearchResult] {
+        try await live.searchDocuments(request)
+    }
+
+    public func searchDocumentTitles(_ request: DocumentSearchTitlesRequest) async throws -> [OutlineDocument] {
+        try await live.searchDocumentTitles(request)
+    }
+
+    public func createDocument(_ request: CreateDocumentRequest) async throws -> OutlineDocument {
+        try await live.createDocument(request)
+    }
+
+    public func updateDocument(_ request: UpdateDocumentRequest) async throws -> OutlineDocument {
+        try await live.updateDocument(request)
+    }
+
+    public func starDocument(_ request: StarDocumentRequest) async throws -> OutlineStar {
+        try await live.starDocument(request)
+    }
+
+    public func templatizeDocument(_ request: TemplatizeDocumentRequest) async throws -> OutlineTemplate {
+        try await live.templatizeDocument(request)
+    }
+
+    public func duplicateDocument(_ request: DuplicateDocumentRequest) async throws -> [OutlineDocument] {
+        try await live.duplicateDocument(request)
+    }
+
+    public func unpublishDocument(_ request: UnpublishDocumentRequest) async throws -> OutlineDocument {
+        try await live.unpublishDocument(request)
+    }
+
+    public func archiveDocument(id: String) async throws -> OutlineDocument {
+        try await live.archiveDocument(id: id)
+    }
+
+    public func moveDocument(_ request: MoveDocumentRequest) async throws {
+        try await live.moveDocument(request)
+    }
+
+    public func deleteDocument(_ request: DeleteDocumentRequest) async throws {
+        try await live.deleteDocument(request)
+    }
+
+    public func documentInsights(_ request: DocumentInsightsRequest) async throws -> [OutlineDocumentInsight] {
+        try await live.documentInsights(request)
+    }
+
+    public func listRevisions(_ request: ListRevisionsRequest) async throws -> [OutlineRevision] {
+        try await live.listRevisions(request)
+    }
+
+    public func exportDocument(id: String) async throws -> String {
+        try await live.exportDocument(id: id)
+    }
+
+    public func createShare(_ request: CreateShareRequest) async throws -> OutlineShare {
+        try await live.createShare(request)
+    }
+
+    public func shareInfo(documentId: String) async throws -> OutlineShare? {
+        try await live.shareInfo(documentId: documentId)
+    }
+
+    public func updateShare(_ request: UpdateShareRequest) async throws -> OutlineShare {
+        try await live.updateShare(request)
+    }
+
+    public func listShares(_ request: ListSharesRequest) async throws -> [OutlineShare] {
+        try await live.listShares(request)
+    }
+
+    public func revokeShare(id: String) async throws {
+        try await live.revokeShare(id: id)
+    }
+
+    public func createPin(_ request: CreatePinRequest) async throws -> OutlinePin {
+        try await live.createPin(request)
+    }
+
+    public func listPins(_ request: ListPinsRequest) async throws -> [OutlinePin] {
+        try await live.listPins(request)
+    }
+
+    public func deletePin(id: String) async throws {
+        try await live.deletePin(id: id)
+    }
+
+    public func createSubscription(_ request: CreateSubscriptionRequest) async throws -> OutlineSubscription {
+        try await live.createSubscription(request)
+    }
+
+    public func listSubscriptions(_ request: ListSubscriptionsRequest) async throws -> [OutlineSubscription] {
+        try await live.listSubscriptions(request)
+    }
+
+    public func deleteSubscription(id: String) async throws {
+        try await live.deleteSubscription(id: id)
+    }
+
+    public func listViews(_ request: ListViewsRequest) async throws -> [OutlineView] {
+        try await live.listViews(request)
+    }
+
+    public func addDocumentUser(_ request: AddDocumentUserRequest) async throws -> OutlineMembership {
+        try await live.addDocumentUser(request)
+    }
+
+    public func removeDocumentUser(_ request: RemoveDocumentUserRequest) async throws {
+        try await live.removeDocumentUser(request)
+    }
+
+    public func documentUsers(_ request: ListDocumentUsersRequest) async throws -> [OutlineDocumentMember] {
+        try await live.documentUsers(request)
+    }
+
+    public func listUsers(_ request: ListUsersRequest) async throws -> [OutlineUser] {
+        try await live.listUsers(request)
+    }
+
+    public func updateCollection(_ request: UpdateCollectionRequest) async throws -> OutlineCollection {
+        try await live.updateCollection(request)
+    }
+
+    public func deleteCollection(id: String) async throws {
+        try await live.deleteCollection(id: id)
+    }
+
+    public func exportCollection(_ request: ExportCollectionRequest) async throws -> OutlineFileOperation {
+        try await live.exportCollection(request)
+    }
+
+    public func starCollection(_ request: StarCollectionRequest) async throws -> OutlineStar {
+        try await live.starCollection(request)
+    }
+
+    public func listStars(_ request: ListStarsRequest) async throws -> [OutlineStar] {
+        try await live.listStars(request)
+    }
+
+    public func deleteStar(id: String) async throws {
+        try await live.deleteStar(id: id)
+    }
+
+    public func currentUser() async throws -> OutlineUser {
+        try await live.currentUser()
+    }
+
+    // MARK: - Helpers
+
+    private func cachedFetch<T: Codable>(key: String, fetch: () async throws -> T) async throws -> T {
+        do {
+            let result = try await fetch()
+            if let data = try? encoder.encode(result) {
+                await cache.save(data, forKey: key)
+            }
+            return result
+        } catch {
+            if let data = await cache.load(forKey: key), let cached = try? decoder.decode(T.self, from: data) {
+                return cached
+            }
+            throw error
+        }
+    }
+
+    private func requestKey(_ prefix: String, _ request: some Encodable) -> String {
+        guard let data = try? keyEncoder.encode(request), let json = String(data: data, encoding: .utf8) else {
+            return prefix
+        }
+        return "\(prefix):\(json)"
+    }
+}

OutlineKit/Sources/OutlineKit/Caching/OfflineCacheStore.swift

@@ -0,0 +1,29 @@
+import Foundation
+import SwiftData
+
+/// Read-through cache backing `CachingOutlineAPIClient` — stores whatever it
+/// last fetched successfully, keyed by request shape, so browsing keeps
+/// working (stale) once the network stops.
+@ModelActor
+public actor OfflineCacheStore {
+    public static func makeContainer(inMemory: Bool = false) throws -> ModelContainer {
+        let configuration = ModelConfiguration(isStoredInMemoryOnly: inMemory)
+        return try ModelContainer(for: CachedPayload.self, configurations: configuration)
+    }
+
+    public func save(_ data: Data, forKey key: String) {
+        let descriptor = FetchDescriptor<CachedPayload>(predicate: #Predicate { $0.key == key })
+        if let existing = try? modelContext.fetch(descriptor).first {
+            existing.payload = data
+            existing.cachedAt = Date()
+        } else {
+            modelContext.insert(CachedPayload(key: key, payload: data, cachedAt: Date()))
+        }
+        try? modelContext.save()
+    }
+
+    public func load(forKey key: String) -> Data? {
+        let descriptor = FetchDescriptor<CachedPayload>(predicate: #Predicate { $0.key == key })
+        return try? modelContext.fetch(descriptor).first?.payload
+    }
+}

OutlineKit/Tests/OutlineKitTests/CachingOutlineAPIClientTests.swift

@@ -0,0 +1,177 @@
+import XCTest
+@testable import OutlineKit
+
+private struct NotStubbed: Error {}
+
+/// Conforms to the full protocol (so it can stand in for `live`), but only
+/// the two methods under test in this file have real behavior — everything
+/// else throws loudly if a test accidentally exercises it.
+private final class StubOutlineAPIClient: OutlineAPIClient, @unchecked Sendable {
+    var documentInfoHandler: (@Sendable (String) async throws -> OutlineDocument)?
+    var listCollectionsHandler: (@Sendable (Int, Int) async throws -> [OutlineCollection])?
+
+    func authInfo() async throws -> OutlineAuthInfo { throw NotStubbed() }
+
+    func documentInfo(id: String) async throws -> OutlineDocument {
+        guard let handler = documentInfoHandler else { throw NotStubbed() }
+        return try await handler(id)
+    }
+
+    func listDocuments(collectionId: String?, parentDocumentId: String?, offset: Int, limit: Int) async throws -> [OutlineDocument] {
+        throw NotStubbed()
+    }
+
+    func documentsList(_ request: DocumentsListRequest) async throws -> [OutlineDocument] { throw NotStubbed() }
+    func listViewedDocuments(offset: Int, limit: Int) async throws -> [OutlineDocument] { throw NotStubbed() }
+    func searchDocuments(_ request: DocumentSearchRequest) async throws -> [OutlineDocumentSearchResult] { throw NotStubbed() }
+    func searchDocumentTitles(_ request: DocumentSearchTitlesRequest) async throws -> [OutlineDocument] { throw NotStubbed() }
+    func createDocument(_ request: CreateDocumentRequest) async throws -> OutlineDocument { throw NotStubbed() }
+    func updateDocument(_ request: UpdateDocumentRequest) async throws -> OutlineDocument { throw NotStubbed() }
+    func starDocument(_ request: StarDocumentRequest) async throws -> OutlineStar { throw NotStubbed() }
+    func templatizeDocument(_ request: TemplatizeDocumentRequest) async throws -> OutlineTemplate { throw NotStubbed() }
+    func duplicateDocument(_ request: DuplicateDocumentRequest) async throws -> [OutlineDocument] { throw NotStubbed() }
+    func unpublishDocument(_ request: UnpublishDocumentRequest) async throws -> OutlineDocument { throw NotStubbed() }
+    func archiveDocument(id: String) async throws -> OutlineDocument { throw NotStubbed() }
+    func moveDocument(_ request: MoveDocumentRequest) async throws { throw NotStubbed() }
+    func deleteDocument(_ request: DeleteDocumentRequest) async throws { throw NotStubbed() }
+    func documentInsights(_ request: DocumentInsightsRequest) async throws -> [OutlineDocumentInsight] { throw NotStubbed() }
+    func listRevisions(_ request: ListRevisionsRequest) async throws -> [OutlineRevision] { throw NotStubbed() }
+    func exportDocument(id: String) async throws -> String { throw NotStubbed() }
+    func createShare(_ request: CreateShareRequest) async throws -> OutlineShare { throw NotStubbed() }
+    func shareInfo(documentId: String) async throws -> OutlineShare? { throw NotStubbed() }
+    func updateShare(_ request: UpdateShareRequest) async throws -> OutlineShare { throw NotStubbed() }
+    func listShares(_ request: ListSharesRequest) async throws -> [OutlineShare] { throw NotStubbed() }
+    func revokeShare(id: String) async throws { throw NotStubbed() }
+    func createPin(_ request: CreatePinRequest) async throws -> OutlinePin { throw NotStubbed() }
+    func listPins(_ request: ListPinsRequest) async throws -> [OutlinePin] { throw NotStubbed() }
+    func deletePin(id: String) async throws { throw NotStubbed() }
+    func createSubscription(_ request: CreateSubscriptionRequest) async throws -> OutlineSubscription { throw NotStubbed() }
+    func listSubscriptions(_ request: ListSubscriptionsRequest) async throws -> [OutlineSubscription] { throw NotStubbed() }
+    func deleteSubscription(id: String) async throws { throw NotStubbed() }
+    func listViews(_ request: ListViewsRequest) async throws -> [OutlineView] { throw NotStubbed() }
+    func addDocumentUser(_ request: AddDocumentUserRequest) async throws -> OutlineMembership { throw NotStubbed() }
+    func removeDocumentUser(_ request: RemoveDocumentUserRequest) async throws { throw NotStubbed() }
+    func documentUsers(_ request: ListDocumentUsersRequest) async throws -> [OutlineDocumentMember] { throw NotStubbed() }
+    func listUsers(_ request: ListUsersRequest) async throws -> [OutlineUser] { throw NotStubbed() }
+
+    func listCollections(offset: Int, limit: Int) async throws -> [OutlineCollection] {
+        guard let handler = listCollectionsHandler else { throw NotStubbed() }
+        return try await handler(offset, limit)
+    }
+
+    func collectionInfo(id: String) async throws -> OutlineCollection { throw NotStubbed() }
+    func updateCollection(_ request: UpdateCollectionRequest) async throws -> OutlineCollection { throw NotStubbed() }
+    func deleteCollection(id: String) async throws { throw NotStubbed() }
+    func exportCollection(_ request: ExportCollectionRequest) async throws -> OutlineFileOperation { throw NotStubbed() }
+    func starCollection(_ request: StarCollectionRequest) async throws -> OutlineStar { throw NotStubbed() }
+    func listStars(_ request: ListStarsRequest) async throws -> [OutlineStar] { throw NotStubbed() }
+    func deleteStar(id: String) async throws { throw NotStubbed() }
+    func currentUser() async throws -> OutlineUser { throw NotStubbed() }
+}
+
+private struct StubTransportError: Error {}
+
+final class CachingOutlineAPIClientTests: XCTestCase {
+    private func makeCache() throws -> OfflineCacheStore {
+        OfflineCacheStore(modelContainer: try OfflineCacheStore.makeContainer(inMemory: true))
+    }
+
+    private func makeDocument(id: String = "doc-1", title: String = "Hello") -> OutlineDocument {
+        OutlineDocument(
+            id: id,
+            title: title,
+            text: "body",
+            url: "/doc/\(id)",
+            createdAt: Date(timeIntervalSince1970: 0),
+            updatedAt: Date(timeIntervalSince1970: 0)
+        )
+    }
+
+    private func makeCollection(id: String = "col-1", name: String = "Engineering") -> OutlineCollection {
+        OutlineCollection(
+            id: id,
+            name: name,
+            createdAt: Date(timeIntervalSince1970: 0),
+            updatedAt: Date(timeIntervalSince1970: 0)
+        )
+    }
+
+    func testDocumentInfoWritesThroughToCacheOnSuccess() async throws {
+        let stub = StubOutlineAPIClient()
+        let document = makeDocument()
+        stub.documentInfoHandler = { _ in document }
+        let sut = CachingOutlineAPIClient(live: stub, cache: try makeCache())
+
+        let result = try await sut.documentInfo(id: "doc-1")
+
+        XCTAssertEqual(result, document)
+    }
+
+    func testDocumentInfoFallsBackToCacheWhenLiveFails() async throws {
+        let stub = StubOutlineAPIClient()
+        let document = makeDocument()
+        var callCount = 0
+        stub.documentInfoHandler = { _ in
+            callCount += 1
+            if callCount == 1 { return document }
+            throw StubTransportError()
+        }
+        let sut = CachingOutlineAPIClient(live: stub, cache: try makeCache())
+
+        // First call succeeds and populates the cache.
+        _ = try await sut.documentInfo(id: "doc-1")
+        // Second call fails live — should transparently return the cached value.
+        let result = try await sut.documentInfo(id: "doc-1")
+
+        XCTAssertEqual(result, document)
+        XCTAssertEqual(callCount, 2)
+    }
+
+    func testDocumentInfoRethrowsWhenLiveFailsAndCacheIsEmpty() async throws {
+        let stub = StubOutlineAPIClient()
+        stub.documentInfoHandler = { _ in throw StubTransportError() }
+        let sut = CachingOutlineAPIClient(live: stub, cache: try makeCache())
+
+        do {
+            _ = try await sut.documentInfo(id: "doc-1")
+            XCTFail("Expected an error")
+        } catch is StubTransportError {
+            // expected
+        }
+    }
+
+    func testListCollectionsFallsBackToCacheWhenLiveFails() async throws {
+        let stub = StubOutlineAPIClient()
+        let collections = [makeCollection()]
+        var callCount = 0
+        stub.listCollectionsHandler = { _, _ in
+            callCount += 1
+            if callCount == 1 { return collections }
+            throw StubTransportError()
+        }
+        let sut = CachingOutlineAPIClient(live: stub, cache: try makeCache())
+
+        _ = try await sut.listCollections(offset: 0, limit: 25)
+        let result = try await sut.listCollections(offset: 0, limit: 25)
+
+        XCTAssertEqual(result, collections)
+    }
+
+    func testDifferentDocumentIdsAreCachedSeparately() async throws {
+        let stub = StubOutlineAPIClient()
+        let docOne = makeDocument(id: "doc-1", title: "One")
+        let docTwo = makeDocument(id: "doc-2", title: "Two")
+        stub.documentInfoHandler = { id in id == "doc-1" ? docOne : docTwo }
+        let sut = CachingOutlineAPIClient(live: stub, cache: try makeCache())
+
+        _ = try await sut.documentInfo(id: "doc-1")
+        _ = try await sut.documentInfo(id: "doc-2")
+        stub.documentInfoHandler = { _ in throw StubTransportError() }
+
+        let cachedOne = try await sut.documentInfo(id: "doc-1")
+        let cachedTwo = try await sut.documentInfo(id: "doc-2")
+
+        XCTAssertEqual(cachedOne, docOne)
+        XCTAssertEqual(cachedTwo, docTwo)
+    }
+}

Outpost/Features/Collections/ContentView_macOS.swift

@@ -31,6 +31,10 @@ struct ContentView_macOS: View {
             VStack(spacing: 0) {
                 SidebarSearchField(text: $globalSearchQuery)
                 Divider()
+                if !session.networkMonitor.isOnline {
+                    OfflineBanner()
+                    Divider()
+                }
                 sidebar
                 AccountFooter()
             }

Outpost/Features/Collections/OfflineBanner.swift

@@ -0,0 +1,21 @@
+#if os(macOS)
+import SwiftUI
+
+/// Shown at the top of the sidebar whenever `NetworkMonitor` reports no
+/// connection — cached collections/documents keep browsing working, but the
+/// user should know they might be looking at stale data.
+struct OfflineBanner: View {
+    var body: some View {
+        HStack(spacing: 8) {
+            Image(systemName: "wifi.slash")
+                .foregroundStyle(.orange)
+            Text("Offline — showing cached content")
+                .font(.callout)
+            Spacer(minLength: 0)
+        }
+        .padding(.horizontal, 12)
+        .padding(.vertical, 8)
+        .background(Color.orange.opacity(0.12))
+    }
+}
+#endif

Outpost/Root/SessionStore.swift

@@ -17,6 +17,11 @@ final class SessionStore {
     var teamName: String?
     var teamAvatarURL: URL?
     private(set) var apiClient: OutlineAPIClient?
+    let networkMonitor = NetworkMonitor()
+    /// `nil` only if the on-disk SwiftData store failed to open (e.g. disk
+    /// full) — in that case `apiClient` falls back to talking to the server
+    /// directly with no offline cache, rather than failing sign-in outright.
+    private let cacheStore: OfflineCacheStore?
 
     var serverURL: URL? {
         defaults.string(forKey: Self.serverURLDefaultsKey).flatMap(URL.init(string:))
@@ -26,23 +31,27 @@ final class SessionStore {
         self.tokenStore = tokenStore
         self.defaults = defaults
         self.isSignedIn = (try? tokenStore.token()) != nil
+        self.cacheStore = (try? OfflineCacheStore.makeContainer()).map(OfflineCacheStore.init(modelContainer:))
 
         if isSignedIn, let serverURL {
-            apiClient = LiveOutlineAPIClient(
+            apiClient = Self.makeAPIClient(serverURL: serverURL, tokenStore: tokenStore, cache: cacheStore)
-                configuration: OutlineConfiguration(baseURL: serverURL),
-                tokenStore: tokenStore
-            )
         }
     }
 
     func signIn(serverURL: URL, user: OutlineUser, team: OutlineTeam) {
         defaults.set(serverURL.absoluteString, forKey: Self.serverURLDefaultsKey)
-        apiClient = LiveOutlineAPIClient(
+        apiClient = Self.makeAPIClient(serverURL: serverURL, tokenStore: tokenStore, cache: cacheStore)
+        apply(user: user, team: team, serverURL: serverURL)
+        isSignedIn = true
+    }
+
+    private static func makeAPIClient(serverURL: URL, tokenStore: TokenStoring, cache: OfflineCacheStore?) -> OutlineAPIClient {
+        let live = LiveOutlineAPIClient(
             configuration: OutlineConfiguration(baseURL: serverURL),
             tokenStore: tokenStore
         )
-        apply(user: user, team: team, serverURL: serverURL)
+        guard let cache else { return live }
-        isSignedIn = true
+        return CachingOutlineAPIClient(live: live, cache: cache)
     }
 
     func signOut() {

Outpost/Support/NetworkMonitor.swift

@@ -0,0 +1,29 @@
+import Foundation
+import Network
+import Observation
+
+/// Backs the sidebar's offline badge — purely a UI signal. Unrelated to
+/// `CachingOutlineAPIClient`'s own fallback logic, which reacts to actual
+/// request failures rather than pre-checking reachability.
+@Observable
+@MainActor
+final class NetworkMonitor {
+    private(set) var isOnline = true
+
+    private let monitor = NWPathMonitor()
+    private let queue = DispatchQueue(label: "com.outpost.network-monitor")
+
+    init() {
+        monitor.pathUpdateHandler = { [weak self] path in
+            let online = path.status == .satisfied
+            Task { @MainActor in
+                self?.isOnline = online
+            }
+        }
+        monitor.start(queue: queue)
+    }
+
+    deinit {
+        monitor.cancel()
+    }
+}