atomcode-core 4.23.1

pub enum Msg<'a> {
    // WelcomeWizard
    WelcomeBannerLine1,
    WelcomeBannerLine2,
    WelcomeOptionCodingPlan,
    WelcomeOptionCodingPlanHint,
    WelcomeOptionConfigureManually,
    WelcomeOptionConfigureManuallyHint,
    WelcomeOptionSkip,
    WelcomeOptionSkipHint,

    // ── /codingplan ──
    CodingPlanSetupFailed { error: &'a str },
    /// Emitted inline by /codingplan and `atomcode codingplan` when the
    /// stored OAuth token comes back 401 from the CodingPlan API
    /// mid-flow. We re-run the same OAuth dance `/login` uses, save the
    /// fresh token, and retry the whole setup once — this line tells
    /// the user that's what's about to happen so the second
    /// "Open this URL in any browser…" block isn't a surprise.
    CpReauthAfter401,
    /// Emitted by the OpenAI provider when an AtomGit-gateway chat
    /// request returns 401 and our one automatic refresh_token attempt
    /// either failed or the retried request still came back 401. The
    /// raw server message ("Gitcode auth: token rejected") is not
    /// useful to end users — this replaces it with an actionable hint
    /// pointing at `/login`. Non-atomgit gateways still surface the
    /// verbatim server error so user-supplied API keys (sk-...) get
    /// the diagnostic detail.
    ChatAuthExpired,
    // SetupReport renderer (core/coding_plan/setup.rs)
    CpSetupHeader,
    CpLoggedIn { who: &'a str, username: &'a str, email: &'a str },
    CpStepSkipped { reason: &'a str },
    CpLoginFailed { error: &'a str },
    CpClaimed { message: &'a str, plan_type: &'a str },
    CpClaimSuccessFallback,
    CpAlreadyClaimed { reason: &'a str },
    CpClaimFailed { error: &'a str },
    /// Per-tier cascade row — winning tier, fresh claim.
    /// Example (zh-CN): `  ✓ CodingPlan Lite 领取成功`
    CpClaimTierSucceeded { tier: &'a str },
    /// Per-tier cascade row — winning tier, server reported the user
    /// already holds this tier or higher (`duplicate=true`).
    CpClaimTierAlreadyHeld { tier: &'a str },
    /// Per-tier cascade row — tier was refused (2xx with success=
    /// false / 5xx / transport). `reason` is the server's human-
    /// readable message (e.g. `额度已满`, `暂无开放`) or a short
    /// rendering of the transport error.
    CpClaimTierFailed { tier: &'a str, reason: &'a str },
    CpAddedProviders { count: usize, plural_s: &'a str },
    /// Locked-model row. `name` is expected to be pre-decorated with
    /// U+0336 combining strikethrough by the caller (see
    /// `coding_plan::setup::strikethrough`), so the template itself
    /// stays a plain `format!` and survives every renderer's CSI
    /// scrubber without needing SGR escapes.
    CpLocked { name: &'a str },
    CpProviderRow { provider: &'a str, model: &'a str, default_suffix: &'a str },
    CpDefaultSuffix,
    CpVisionAuto { kind: &'a str },
    CpVisionUserSupplied { kind: &'a str },
    CpVisionCleared,
    CpModelsSkipped { reason: &'a str },
    CpModelsFailed { error: &'a str },
    CpStatusHeader,
    CpPlanPending { plan: &'a str },
    CpPlanActive {
        plan: &'a str,
        expires_at: &'a str,
        remaining_days: i32,
        total_days: i32,
    },
    CpUsageLine { usage: &'a str, reset_at: &'a str, duration: &'a str },
    CpWindowQuotaExhausted,
    CpWindowQuotaHint { hint: &'a str },
    CpStatusFetchSkipped { reason: &'a str },
    CpStatusFetchFailed { error: &'a str },
    /// Open-source build attempted to use a CodingPlan provider. The
    /// signing capability is not present in this build, so the request
    /// can't reach the AtomGit LLM gateway. Surface a clear hint
    /// pointing to the official Releases page.
    CpOfficialBuildRequired,
    /// Official build, but no stored auth (or auth has empty
    /// `user.id` / `access_token`). The signing path needs these
    /// fields to derive a per-user key; without them the request
    /// can't be signed. Surface a "please run `/codingplan` to log
    /// in" hint instead of the misleading "official build required"
    /// message — the user IS on an official build.
    CpAuthRequired,
    /// Server returned `ATOMCODE_SIG_STALE` — the request's signed
    /// timestamp is outside the ±5min window the gateway accepts.
    /// Typically caused by an unsynced local clock.
    CpSignStaleClockSkew,
    /// Server returned `ATOMCODE_SIG_REPLAY` even after the client's
    /// one automatic retry with a fresh nonce. Surface a "please retry
    /// the command" hint — usually self-heals on the next attempt.
    CpSignReplayPersisted,
    /// Server returned `ATOMCODE_SIG_INVALID` AND the alg_version is
    /// no longer in the server's `accepted_versions` set — the client
    /// binary is too old. Force-upgrade hint.
    CpSignVersionTooOld,
    /// Server returned `426 Upgrade Required` — emergency rotation
    /// playbook in progress; this build cannot continue without
    /// upgrading.
    CpUpgradeRequired,

    // i18n self-errors
    ErrUnsupportedLocale { input: &'a str },

    // ── Status bar (build_status) ──
    StatusNoProvider,
    StatusUpgradeHint { version: &'a str },
    StatusModelNotConfigured,
    /// macOS / Linux variant: "Image in clipboard · ctrl+v to paste".
    /// Ctrl+V is intercepted by Windows Terminal / conhost before
    /// reaching atomcode, so Windows builds emit
    /// `StatusClipboardImageHintSlash` instead.
    StatusClipboardImageHint,
    /// Windows variant: "Image in clipboard · /paste". Tells the
    /// user to fall back on the `/paste` slash command, which works
    /// in every terminal regardless of host keybinds.
    StatusClipboardImageHintSlash,

    // ── /status command body ──
    StatusBody { model: &'a str, dir: &'a str, config: &'a str, tokens: usize },
    StatusCpNotSignedIn,
    StatusCpFetchFailed { error: &'a str },
    StatusCpNoActive,
    StatusCpLine {
        plan: &'a str,
        expires_at: &'a str,
        remaining_days: i32,
        total_days: i32,
    },
    StatusCpUsage { usage: &'a str, reset_at: &'a str, seconds: i64 },
    StatusCpWindowExhausted,
    StatusCpWindowHint { hint: &'a str },
    StatusInstructionFilesHeader,
    StatusInstructionPresent { path: &'a str, label: &'a str },
    StatusInstructionMissing { label: &'a str },

    // ── /login completion ──
    LoginSignedInWithCpHint { name: &'a str, username: &'a str },

    // ── Help / commands ──
    HelpAvailableCommands,
    /// Full keyboard-shortcuts reference dumped to scrollback by the
    /// `/keys` slash command. Carries every line of the panel as a
    /// single multi-line string so translators can adjust column
    /// alignment per locale without rebuilding rows in Rust.
    KeybindingsHelp,

    // ── Provider wizard ──
    ProviderWizardHeader,
    ProviderWizardCancelled,
    ProviderMenuAdd,
    ProviderMenuAddDesc,
    ProviderMenuEdit,
    ProviderMenuEditDesc,
    ProviderMenuDelete,
    ProviderMenuDeleteDesc,
    ProviderMenuSetDefault,
    ProviderMenuSetDefaultDesc,
    ProviderNoProviders,
    ProviderDeleteConfirm { name: &'a str },
    ProviderDeleted { name: &'a str },
    ProviderDeleteKept,
    ProviderDefaultSet { name: &'a str },
    ProviderAdded { name: &'a str, model: &'a str },
    ProviderUpdated { name: &'a str },
    ProviderStepName,
    ProviderStepType,
    ProviderStepTypeWithHint { current: &'a str },
    ProviderStepBaseUrl,
    ProviderStepBaseUrlWithHint { current: &'a str },
    ProviderDefaultHint,
    ProviderStepApiKey,
    ProviderStepApiKeyWithHint { hint: &'a str },
    ProviderStepApiKeySet,
    ProviderStepApiKeyUnset,
    ProviderStepModel,
    ProviderStepModelWithHint { current: &'a str },
    ProviderNameEmpty,
    ProviderUnknownType,
    ProviderUnknownTypeEdit,
    ProviderModelEmpty,
    ProviderEditKeep,

    // ── Model picker ──
    ModelSwitched { provider: &'a str, model: &'a str },

    // ── Session picker ──
    SessionLoadFailed { error: &'a str },
    SessionResumedLabel { name: &'a str },
    SessionTimeJustNow,
    SessionTimeMinAgo { n: u64 },
    SessionTimeHourAgo { n: u64 },
    SessionTimeDayAgo { n: u64 },
    SessionMsgCount { count: usize },
    SessionNameEmpty,
    SessionNameTooLong { max: usize },
    SessionNameControlChars,
    SessionListFailed { error: &'a str },
    SessionRenamed { old: &'a str, new: &'a str },
    SessionSaveFailed { error: &'a str },
    SessionNoneSelected,
    SessionRenameEditing { buffer: &'a str },

    // ── Dir picker ──
    DirCurrent,
    DirNotExists { path: &'a str },
    DirChanged { path: &'a str },
    DirNotADirectory { path: &'a str },

    // ── Issue wizard ──
    IssueCancelled,
    IssueNewOn { owner: &'a str, repo: &'a str },
    IssueStep1,
    IssueStep2,
    IssueTitleConfirmed { title: &'a str },
    IssueRequiredField { field: &'a str },
    IssueCreated { number: u64, title: &'a str, url: &'a str },
    IssueCreateFailed { error: &'a str },

    // ── Language ──
    /// Confirmation rendered to scrollback after the user picks a
    /// locale via `/language` (modal or arg). Already includes the
    /// leading "  " indent and trailing "\n" so the call site is just
    /// `renderer.render(UiLine::CommandOutput(t(Msg::LanguageSwitched
    /// { ... }).into_owned()))`.
    LanguageSwitched { label: &'a str, locale: &'a str },

    // ── Idle / onboarding hints ──
    /// "type something, or press " (text before the slash)
    IdleHintPrefix,
    /// "/" (the slash shortcut itself — kept separate for accent styling)
    IdleHintSlash,
    /// " to browse commands" (text after the slash)
    IdleHintSuffix,
    /// Complete plain-text version: "type something, or press / to browse commands"
    IdleHintFull,
    /// "/provider" command label
    IdleHintProvider,
    /// "to add a custom model" (text after /provider)
    IdleHintProviderSuffix,
    /// Complete plain-text version: "/provider  to add a custom model"
    IdleHintProviderFull,
    /// "/codingplan" command label
    IdleHintCodingplan,
    /// "to claim a free token quota" (text after /codingplan)
    IdleHintCodingplanSuffix,
    /// Complete plain-text version: "/codingplan  to claim a free token quota"
    IdleHintCodingplanFull,

    // ── Slash-command high-frequency messages ──
    CmdSwitchedPlanMode,
    CmdSwitchedBuildMode,
    CmdNewSession,
    CmdNoProviders,
    CmdNoSessions,
    CmdUnknownCommand { name: &'a str },
    CmdLoginFailed { error: &'a str },
    CmdLogoutDone,
    CmdLogoutFailed { error: &'a str },
    CmdWhoamiNotSignedIn,
    CmdReloadDone { provider: &'a str, model: &'a str },
    CmdReloadFailed { error: &'a str },
    CmdUndoNotSupported,
    CmdNoChanges,
    CmdCheckingUpdate,
    CmdNoActiveProvider,

    // ── Approval prompt ──
    ApprovalPromptAlt { tool: &'a str, detail: &'a str },
    ApprovalWaitingLabel,
    ApprovalAllow,
    ApprovalAlways,
    ApprovalDeny,

    // ── Cancelled / Error prefix ──
    Cancelled,
    ErrorPrefix { msg: &'a str },

    // ── Upgrade messages ──
    UpgradeSuccess { from: &'a str, to: &'a str },
    UpgradeManifestFetched { version: &'a str },
    UpgradeDownloading { pct: i32, bytes: u64, total: u64 },
    UpgradeVerifying,
    UpgradeReplacing,
    UpgradeDone { version: &'a str, backup: &'a str },
    UpgradeAlreadyLatest { current: &'a str, latest: &'a str },
    UpgradeFailed { error: &'a str },
    UpgradeRolledBack { exe: &'a str, backup: &'a str },

    // ── Terminal keyboard hints ──
    KbdHintMacos,
    KbdHintOther,

    // ── JediTerm / conhost fallback ──
    JediTermFallback,
    LegacyConhostFallback,

    // ── Background task ──
    BackgroundComplete { turns: usize },
    BackgroundFailed { turns: usize },
    BackgroundFilesEdited,

    // ── /config command ──
    ConfigProviderLabel { provider: &'a str, path: &'a str },

    // ── /cost command ──
    CostReport {
        prompt: usize,
        completion: usize,
        cached: usize,
        cache_rate: usize,
        total: usize,
        cost: &'a str,
    },

    // ── /think command ──
    ThinkStatus { status: &'a str, budget: u32, provider: &'a str },
    ThinkEnabled { budget: u32 },
    ThinkDisabled,
    ThinkBudgetSet { n: u32 },
    ThinkBudgetTooSmall { n: u32 },
    ThinkBudgetUsage,
    ThinkUsage,

    // ── /remember, /forget ──
    RememberUsage,
    ForgetUsage,

    // ── /background ──
    BackgroundUsage,

    // ── /init ──
    InitAlreadyExists { path: &'a str },
    InitWrote { path: &'a str, bytes: usize },
    InitFailed { error: &'a str },

    // ── /cd ──
    CdWorkingDir { cwd: &'a str },

    // ── /diff ──
    DiffFailed { error: &'a str },

    // ── /upgrade ──
    UpgradeUnknownArg { arg: &'a str },

    // ── /skills ──
    SkillsNone,
    SkillsAvailable,
    SkillUnknown { name: &'a str },

    // ── /mcp ──
    McpReloading { count: usize },
    McpConnecting,
    McpConnectingServer { name: &'a str },
    McpNoServersConfigured,
    McpClearedReconnecting { removed: usize },
    McpClearedNoServers { removed: usize },
    McpToolsUsage,
    McpToolsListing { server: &'a str },
    McpNoRegistry,
    McpServersHeader,
    McpReloadFailed { error: &'a str },
    // /mcp login / logout
    McpOAuthLoginUsage,
    McpOAuthLogoutUsage,
    McpOAuthLoadConfigFailed { error: &'a str },
    McpOAuthServerNotFound { server: &'a str },
    McpOAuthStarting { server: &'a str },
    McpOAuthSaved { provider: &'a str, server: &'a str },
    McpOAuthFailed { error: &'a str },
    McpOAuthTokenRemoved { server: &'a str },
    McpOAuthNoToken { server: &'a str },
    McpOAuthLogoutFailed { error: &'a str },
    // MCP / LSP server connect feedback (event handler output)
    McpServerConnected { name: &'a str },
    McpServerFailed { name: &'a str, error: &'a str },
    LspServerStarted { name: &'a str, ext: &'a str },
    LspServerFailed { name: &'a str, ext: &'a str, error: &'a str },

    // ── /worktree ──
    WorktreeUsage,
    WorktreeCreateUsage,
    WorktreeCreated { branch: &'a str, base: &'a str, path: &'a str },
    WorktreeCreateFailed { error: &'a str },
    WorktreeNoActive,
    WorktreeListFailed { error: &'a str },
    WorktreeActiveHeader,
    WorktreeHasChanges,
    WorktreeClean,
    WorktreeCurrent,
    WorktreeDoneBack { path: &'a str },
    WorktreeDoneMergeHint { branch: &'a str },
    WorktreeNoSession,
    WorktreeCleanupUsage,
    WorktreeCleaned { branch: &'a str },
    WorktreeCleanedSwitched { path: &'a str },
    WorktreeCleanupUncommitted { branch: &'a str },
    WorktreeCleanupFailed { error: &'a str },

    // ── /help commands (custom commands subcommand) ──
    HelpCustomCommandsHeader,
    HelpCustomNone,
    HelpCustomCreateHint,
    HelpSourceGlobal,
    HelpSourceProject,

    // ── /setup ──
    /// Header line: "✅ Setup complete — 3 installed, 1 skipped, 0 failed · 120ms"
    SetupHeader { installed: usize, skipped: usize, failed: usize, duration_ms: u64 },
    /// "Installed:" section label in setup report.
    SetupInstalledLabel,
    /// "Skipped:" section label in setup report.
    SetupSkippedLabel,
    /// "Failed:" section label in setup report.
    SetupFailedLabel,
    /// Per-item installed row: "  ✓ skill:atomcode-automation-recommender → /path"
    SetupInstalledRow { kind: &'a str, slug: &'a str, path: &'a str },
    /// Per-item skipped row: "  - skill:xyz (hash match)"
    SetupSkippedRow { kind: &'a str, slug: &'a str, reason: &'a str },
    /// Per-item failed row: "  ✗ mcp:xyz — error message"
    SetupFailedRow { kind: &'a str, slug: &'a str, error: &'a str },
    /// "💡 Tip: Run /setup …" — first-run hint shown above the prompt
    /// when the project has no setup state yet.
    CmdSetupTip,
    /// "Running atomcode setup..." — shown while setup is in progress.
    CmdSetupRunning,
    /// "Skills reloaded — N available" — after setup completes and skills are reloaded.
    CmdSetupSkillsReloaded { count: usize },
    /// "setup error: {e}" — when setup::run returns an error.
    CmdSetupError { error: &'a str },
    /// "Running setup skill..." — after seeds installed and skill is auto-invoked.
    CmdSetupRunningSkill,
    /// "Setup skill not found..." — when the setup skill cannot be resolved or expanded.
    CmdSetupSkillMissing,

    // ── /plugin ──
    PluginUsage,
    PluginMarketplaceUsage,
    PluginInstallUsage,
    PluginUninstallUsage,
    PluginNoMarketplaces,
    PluginMarketplacesHeader,
    PluginNoInstalled,
    PluginInstalledHeader,
    PluginMarketplaceCloning { url: &'a str },
    PluginMarketplaceRemoved { name: &'a str },
    PluginMarketplaceRemoveFailed { error: &'a str },
    PluginMarketplaceUpdating { name: &'a str },
    PluginMarketplaceListFailed { error: &'a str },
    PluginInstalling { plugin: &'a str, marketplace: &'a str },
    PluginUninstalled { plugin: &'a str, marketplace: &'a str },
    PluginUninstallFailed { error: &'a str },
    PluginListFailed { error: &'a str },

    // ── Command descriptions (for help_text dynamic lookup) ──
    CmdDescSetup,
    CmdDescCodingplan,
    CmdDescResume,
    CmdDescRename,
    CmdDescLogin,
    CmdDescLogout,
    CmdDescWhoami,
    CmdDescModel,
    CmdDescProvider,
    CmdDescStatus,
    CmdDescConfig,
    CmdDescReload,
    CmdDescCd,
    CmdDescInit,
    CmdDescBg,
    CmdDescBackground,
    CmdDescDiff,
    CmdDescClear,
    CmdDescSession,
    CmdDescCost,
    CmdDescContext,
    CmdDescCompact,
    CmdDescRemember,
    CmdDescForget,
    CmdDescMemory,
    CmdDescMcp,
    CmdDescUndo,
    CmdDescWorktree,
    CmdDescUpgrade,
    CmdDescIssue,
    CmdDescPlan,
    CmdDescBuild,
    CmdDescThink,
    CmdDescHelp,
    CmdDescKeys,
    CmdDescLanguage,
    CmdDescQuit,
    CmdDescSkills,
    CmdDescPlugin,
    /// Description for the `/paste` slash command — pulls a clipboard
    /// image and attaches it as `[Image #N]`. Exists for Windows
    /// users whose Ctrl+V is swallowed by Windows Terminal / conhost
    /// before reaching the app, but works on every platform.
    CmdDescPaste,
    /// `/paste` failed because the clipboard holds no image. Shown
    /// in scrollback as an error line so the user isn't left
    /// wondering whether the command did anything.
    CmdPasteNoImage,

    // ── config save failed ──
    ConfigSaveFailed { error: &'a str },

    // ── OnboardingWizard (multi-step first-run + `/welcome`). Spec:
    //    docs/superpowers/specs/2026-05-11-welcome-wizard-redesign-design.md
    OnboardingStepHeaderWelcome,
    OnboardingStepHeaderLanguage,
    OnboardingStepHeaderSetup,
    OnboardingPanelTitle,
    OnboardingIntroVersionLine { v: &'a str },
    OnboardingIntroBullet1,
    OnboardingIntroBullet2,
    OnboardingIntroBullet3,
    OnboardingIntroPressEnter,
    OnboardingIntroCtrlC,
    OnboardingIntroCompactTagline,
    OnboardingLanguageTitleBilingual,
    OnboardingLanguagePrompt,
    OnboardingLanguageOptionAuto,
    OnboardingLanguageOptionEn,
    OnboardingLanguageOptionZhCn,
    OnboardingSetupTitle,
    OnboardingNavHint,
    OnboardingConfirmClear,
    CmdWelcomeDescription,

    /// Vision preprocessor success banner. Shown as a body line right
    /// after a VL turn finishes, in the form
    ///   `✓ VL recognised image, returned N chars`
    /// (English) /
    ///   `✓ VL 识别图片成功，返回 N chars`
    /// (zh-CN). The model key trails as a dim suffix in the renderer
    /// — kept out of this message so the wrapper styling stays
    /// renderer-side.
    VisionPreprocessSuccess { char_count: usize },

    /// TurnComplete separator summary, e.g.
    ///   `✓ Shipped · 3 rounds · 2 tools · 6.8s · 285 tokens`
    /// `done` is a playful English verb from `DONE_LABELS` — kept
    /// English in every locale because translated cute verbs read
    /// awkward; the structural words (`rounds`/`tools`/`tokens`)
    /// localise. `duration` is a pre-formatted human string (e.g.
    /// "6.8s").
    TurnSummary {
        done: &'a str,
        turn_count: usize,
        tool_call_count: usize,
        duration: &'a str,
        total_tokens: usize,
    },

    // ── OAuth login chrome (/login + /codingplan share these) ──
    /// Header above the QR block when scanning with WeChat is the
    /// expected flow. Includes the leading "  " indent and trailing
    /// "\n\n" paragraph break that the caller used to inline.
    LoginQrHeader,
    /// Separator + URL prelude shown below the QR block when both
    /// QR and URL fallback are available. Leading "\n\n  " and
    /// trailing "\n  " are part of the template.
    LoginUrlAfterQr,
    /// QR + URL both unavailable (Unicode-incapable terminal AND a
    /// platform where URL-based login doesn't work, e.g. OHOS).
    LoginNoQrNoUrl,
    /// URL-only header when QR can't render but URL login works.
    /// Leading "  " indent and trailing "\n  " before the URL.
    LoginUrlOnly,
    /// Footer line: "Press ESC to cancel" with surrounding
    /// blank-line padding.
    LoginCancelHint,

    // ── /context report ──
    CtxUsageHeader,
    CtxUsageNoTurns,
    CtxUsageWaiting,
    CtxProvider,
    CtxCtxName,
    CtxLabelSystemPrompt,
    CtxLabelToolDefs,
    CtxLabelColdZone,
    CtxLabelMessages,
    CtxLabelFree,
    CtxMessagesInWindow { n: usize },
    CtxSystemPromptHeader,
    CtxSystemPromptEmpty,
    /// Used in the "used/window tokens (pct)" line below the bar.
    CtxTokensSuffix,

    // ── /compact ──
    CompactNothingShort,
    CompactStarting,
    CompactNothingNoSavings { before: &'a str, after: &'a str },
    CompactDropped { messages: usize, before: &'a str, after: &'a str },

    /// Surfaced when the user pastes/attaches an image but the active
    /// model can't accept images AND no `vision_preprocessor_provider`
    /// is configured. `model` is the current model identifier.
    ModelNoImageSupport { model: &'a str },

    /// Confirmation hint after the first Ctrl+C on an empty buffer.
    /// "  (press Ctrl+C again to exit)\n" — leading indent + trailing
    /// newline are part of the template.
    CtrlCAgainToExit,

    /// Startup hint shown on terminals where Kitty CSI-u keyboard
    /// disambiguation isn't available, telling the user the
    /// guaranteed-works `\<Enter>` multi-line trick. Multi-line
    /// payload with leading indent + trailing paragraph break.
    HintMultiLineInput,

    // ── /bg (background sessions) ──
    /// Help text for `/bg help`. Multi-line string with leading indent
    /// and trailing newlines baked in.
    BgHelp,
    /// Empty state for `/bg list`.
    BgListEmpty,
    /// Table header for `/bg list`. Trailing newline baked in.
    BgListHeader,
    /// Row format for `/bg list`. `state` is the localised state label,
    /// `age` is the humanised age string, `summary` is the session name.
    BgListRow { slot: usize, short_id: &'a str, state: &'a str, age: &'a str, summary: &'a str },
    /// Localised label for `RuntimeState::Running`.
    BgStateRunning,
    /// Localised label for `RuntimeState::Idle`.
    BgStateIdle,
    /// Localised label for `RuntimeState::Done`.
    BgStateDone,
    /// Localised label for `RuntimeState::Cancelled`.
    BgStateCancelled,
    /// Localised label for `RuntimeState::Error`.
    BgStateError,
    /// Age string: less than 60 seconds.
    BgAgeNow,
    /// Age string: minutes. `n` is the number of minutes.
    BgAgeMinutes { n: u64 },
    /// Age string: hours. `n` is the number of hours.
    BgAgeHours { n: u64 },
    /// Age string: days. `n` is the number of days.
    BgAgeDays { n: u64 },
    /// Error: too many background slots. `max` is the slot limit.
    BgSlotLimitReached { max: usize },
    /// Output after `/bg` sends the current session to background.
    /// `new_id` is the new foreground session short id,
    /// `slot` is the background slot number,
    /// `old_id` is the backgrounded session short id,
    /// `state` is the localised runtime state.
    BgBackgroundCurrent { new_id: &'a str, slot: usize, old_id: &'a str, state: &'a str },
    /// Error: invalid slot number. `slot` is the requested slot,
    /// `available` is the number of available slots.
    BgInvalidSlot { slot: usize, available: usize },
    /// Error: background slot has no runtime client.
    BgNoRuntimeClient,
    /// Output after `/bg <N>` resumes a background session.
    /// `slot` is the resumed slot, `short_id` is the session short id.
    BgResumed { slot: usize, short_id: &'a str },
    /// When resuming moves the previous foreground into a background slot.
    /// `slot` is the new background slot number.
    BgPreviousForegroundMoved { slot: usize },
    /// Output after `/bg drop <N>`. `slot` is the dropped slot,
    /// `short_id` is the session short id.
    BgDropped { slot: usize, short_id: &'a str },
    /// Output after `/background <task>` starts a one-shot task.
    /// `slot` is the background slot, `short_id` is the session short id.
    BgTaskStarted { slot: usize, short_id: &'a str },
    /// Background task timed out. `secs` is the timeout in seconds.
    BgTaskTimedOut { secs: u64 },
    /// Background task internal error. `error` is the error message.
    BgTaskError { error: &'a str },
    /// Background task was cancelled.
    BgTaskCancelled,
    /// Background task finished but produced no summary text.
    BgTaskNoSummary,
}