feat(outlinekit): add language/preferences plumbing for Preferences settings

OutlineUser gains language + preferences fields, new updateUserLanguage/
updateUserPreferences/deleteAccount client methods. Preference wire keys
are best-effort against Outline's own naming, same speculative treatment
as OutlinePin/OutlineDocumentMember — expect a correction round once
tested against a live server.

OutlineKit/Sources/OutlineKit/Caching/CachingOutlineAPIClient.swift

@@ -355,6 +355,18 @@ public actor CachingOutlineAPIClient: OutlineAPIClient {
         try await live.updateUserName(request)
     }
 
+    public func updateUserLanguage(_ request: UpdateUserLanguageRequest) async throws -> OutlineUser {
+        try await live.updateUserLanguage(request)
+    }
+
+    public func updateUserPreferences(_ request: UpdateUserPreferencesRequest) async throws -> OutlineUser {
+        try await live.updateUserPreferences(request)
+    }
+
+    public func deleteAccount() async throws {
+        try await live.deleteAccount()
+    }
+
     // MARK: - Sync management (Settings surface)
 
     public func pendingOperations() async -> [PendingOperationSummary] {

OutlineKit/Sources/OutlineKit/Core/OutlineAPIClient.swift

@@ -83,4 +83,12 @@ public protocol OutlineAPIClient: Sendable {
     func updateUserAvatar(_ request: UpdateUserAvatarRequest) async throws -> OutlineUser
     /// `users.update`, name only. See `UpdateUserNameRequest`.
     func updateUserName(_ request: UpdateUserNameRequest) async throws -> OutlineUser
+    /// `users.update`, language only. See `UpdateUserLanguageRequest`.
+    func updateUserLanguage(_ request: UpdateUserLanguageRequest) async throws -> OutlineUser
+    /// `users.update`, preferences only. See `UpdateUserPreferencesRequest`.
+    func updateUserPreferences(_ request: UpdateUserPreferencesRequest) async throws -> OutlineUser
+    /// Backed by `users.delete` — self-service account deletion, no
+    /// confirmation code param confirmed live, matches every other simple
+    /// no-body delete in this API.
+    func deleteAccount() async throws
 }

OutlineKit/Sources/OutlineKit/LiveOutlineAPIClient.swift

@@ -290,6 +290,18 @@ public actor LiveOutlineAPIClient: OutlineAPIClient {
         try await post("users.update", body: request)
     }
 
+    public func updateUserLanguage(_ request: UpdateUserLanguageRequest) async throws -> OutlineUser {
+        try await post("users.update", body: request)
+    }
+
+    public func updateUserPreferences(_ request: UpdateUserPreferencesRequest) async throws -> OutlineUser {
+        try await post("users.update", body: request)
+    }
+
+    public func deleteAccount() async throws {
+        try await postForSuccess("users.delete", body: EmptyParams())
+    }
+
     private func post<Body: Encodable, Response: Decodable>(_ path: String, body: Body) async throws -> Response {
         guard let token = try? tokenStore.token() else {
             throw OutlineAPIError.tokenUnavailable

OutlineKit/Sources/OutlineKit/Models/OutlineUser.swift

@@ -6,18 +6,24 @@ public struct OutlineUser: Codable, Identifiable, Hashable, Sendable {
     public let email: String?
     public let avatarUrl: String?
     public let role: String?
+    public let language: String?
+    public let preferences: OutlineUserPreferences?
 
     public init(
         id: String,
         name: String,
         email: String? = nil,
         avatarUrl: String? = nil,
-        role: String? = nil
+        role: String? = nil,
+        language: String? = nil,
+        preferences: OutlineUserPreferences? = nil
     ) {
         self.id = id
         self.name = name
         self.email = email
         self.avatarUrl = avatarUrl
         self.role = role
+        self.language = language
+        self.preferences = preferences
     }
 }

OutlineKit/Sources/OutlineKit/Models/OutlineUserPreferences.swift

@@ -0,0 +1,56 @@
+import Foundation
+
+/// `User.preferences` — a free-form JSON blob on Outline's own `User` row,
+/// not a fixed-shape API resource. Field names here are best-effort against
+/// Outline's known preference keys, same "expect a correction round once
+/// tested" treatment as `OutlineDocumentMember`/`OutlinePin`: an unknown key
+/// doesn't break the request (the column round-trips whatever JSON it's
+/// given), but a wrong key silently fails to affect Outline's own behavior
+/// for that toggle server-side even though it round-trips fine within this
+/// app alone.
+public struct OutlineUserPreferences: Codable, Hashable, Sendable {
+    public var rememberLastPath: Bool?
+    public var separateEditing: Bool?
+    public var useCursorPointer: Bool?
+    public var codeBlockLineNumbers: Bool?
+    public var showCommentMarker: Bool?
+    public var smartText: Bool?
+    /// One of `NotificationBadgeStyle`'s raw values.
+    public var notificationBadge: String?
+
+    public init(
+        rememberLastPath: Bool? = nil,
+        separateEditing: Bool? = nil,
+        useCursorPointer: Bool? = nil,
+        codeBlockLineNumbers: Bool? = nil,
+        showCommentMarker: Bool? = nil,
+        smartText: Bool? = nil,
+        notificationBadge: String? = nil
+    ) {
+        self.rememberLastPath = rememberLastPath
+        self.separateEditing = separateEditing
+        self.useCursorPointer = useCursorPointer
+        self.codeBlockLineNumbers = codeBlockLineNumbers
+        self.showCommentMarker = showCommentMarker
+        self.smartText = smartText
+        self.notificationBadge = notificationBadge
+    }
+}
+
+/// App-icon unread indicator style. Values are a guess at Outline's own
+/// wire strings, not confirmed against a live server.
+public enum NotificationBadgeStyle: String, CaseIterable, Identifiable, Sendable {
+    case none
+    case unreadIndicator = "unread"
+    case all
+
+    public var id: String { rawValue }
+
+    public var label: String {
+        switch self {
+        case .none: return "None"
+        case .unreadIndicator: return "Unread Indicator"
+        case .all: return "Unread Count"
+        }
+    }
+}

OutlineKit/Sources/OutlineKit/Requests/UpdateUserLanguageRequest.swift

@@ -0,0 +1,12 @@
+import Foundation
+
+/// `users.update`, language only.
+public struct UpdateUserLanguageRequest: Encodable, Sendable {
+    public let id: String
+    public let language: String
+
+    public init(id: String, language: String) {
+        self.id = id
+        self.language = language
+    }
+}

OutlineKit/Sources/OutlineKit/Requests/UpdateUserPreferencesRequest.swift

@@ -0,0 +1,14 @@
+import Foundation
+
+/// `users.update`, preferences only. Sends the *whole* preferences object
+/// back (not a single changed key) — avoids needing to know whether the
+/// server deep-merges a partial `preferences` body or replaces it outright.
+public struct UpdateUserPreferencesRequest: Encodable, Sendable {
+    public let id: String
+    public let preferences: OutlineUserPreferences
+
+    public init(id: String, preferences: OutlineUserPreferences) {
+        self.id = id
+        self.preferences = preferences
+    }
+}

OutlineKit/Tests/OutlineKitTests/CachingOutlineAPIClientTests.swift

@@ -94,6 +94,9 @@ private final class StubOutlineAPIClient: OutlineAPIClient, @unchecked Sendable
     func deleteAttachment(id: String) async throws { throw NotStubbed() }
     func updateUserAvatar(_ request: UpdateUserAvatarRequest) async throws -> OutlineUser { throw NotStubbed() }
     func updateUserName(_ request: UpdateUserNameRequest) async throws -> OutlineUser { throw NotStubbed() }
+    func updateUserLanguage(_ request: UpdateUserLanguageRequest) async throws -> OutlineUser { throw NotStubbed() }
+    func updateUserPreferences(_ request: UpdateUserPreferencesRequest) async throws -> OutlineUser { throw NotStubbed() }
+    func deleteAccount() async throws { throw NotStubbed() }
 }
 
 private struct StubTransportError: Error {}

OutlineKit/Tests/OutlineKitTests/LiveOutlineAPIClientTests.swift

@@ -1074,6 +1074,77 @@ final class LiveOutlineAPIClientTests: XCTestCase {
         XCTAssertEqual(httpClient.lastRequest?.url?.path, "/api/users.update")
     }
 
+    func testUpdateUserLanguageSendsRequestAndDecodesResult() async throws {
+        let httpClient = MockHTTPClient()
+        httpClient.responseData = """
+        {
+            "data": {
+                "id": "user-1",
+                "name": "Jane Doe",
+                "language": "fr_FR"
+            }
+        }
+        """.data(using: .utf8)!
+
+        let client = LiveOutlineAPIClient(
+            configuration: OutlineConfiguration(baseURL: URL(string: "https://outline.example.com")!),
+            tokenStore: StaticTokenStore(),
+            httpClient: httpClient
+        )
+
+        let user = try await client.updateUserLanguage(UpdateUserLanguageRequest(id: "user-1", language: "fr_FR"))
+
+        XCTAssertEqual(user.language, "fr_FR")
+        XCTAssertEqual(httpClient.lastRequest?.url?.path, "/api/users.update")
+    }
+
+    func testUpdateUserPreferencesSendsWholeObjectAndDecodesResult() async throws {
+        let httpClient = MockHTTPClient()
+        httpClient.responseData = """
+        {
+            "data": {
+                "id": "user-1",
+                "name": "Jane Doe",
+                "preferences": { "rememberLastPath": true, "useCursorPointer": true }
+            }
+        }
+        """.data(using: .utf8)!
+
+        let client = LiveOutlineAPIClient(
+            configuration: OutlineConfiguration(baseURL: URL(string: "https://outline.example.com")!),
+            tokenStore: StaticTokenStore(),
+            httpClient: httpClient
+        )
+
+        let preferences = OutlineUserPreferences(rememberLastPath: true, useCursorPointer: true)
+        let user = try await client.updateUserPreferences(UpdateUserPreferencesRequest(id: "user-1", preferences: preferences))
+
+        XCTAssertEqual(user.preferences?.rememberLastPath, true)
+        XCTAssertEqual(user.preferences?.useCursorPointer, true)
+
+        let sentBody = try JSONSerialization.jsonObject(with: httpClient.lastRequest!.httpBody!) as? [String: Any]
+        let sentPreferences = sentBody?["preferences"] as? [String: Any]
+        XCTAssertEqual(sentPreferences?["rememberLastPath"] as? Bool, true)
+        XCTAssertEqual(sentPreferences?["useCursorPointer"] as? Bool, true)
+    }
+
+    func testDeleteAccountSendsRequest() async throws {
+        let httpClient = MockHTTPClient()
+        httpClient.responseData = """
+        { "success": true }
+        """.data(using: .utf8)!
+
+        let client = LiveOutlineAPIClient(
+            configuration: OutlineConfiguration(baseURL: URL(string: "https://outline.example.com")!),
+            tokenStore: StaticTokenStore(),
+            httpClient: httpClient
+        )
+
+        try await client.deleteAccount()
+
+        XCTAssertEqual(httpClient.lastRequest?.url?.path, "/api/users.delete")
+    }
+
     func testDeleteAttachmentSendsRequest() async throws {
         let httpClient = MockHTTPClient()
         httpClient.responseData = """