Manage the built-in daemon from one place in settings (#1938)

* feat(settings): consolidate daemon management into the host page

The app-level Daemon section and the localhost host page rendered the
same daemon card in two places. The host page is now the single home:
the Host sidebar group leads with Overview, and a desktop-only "Enable
built-in daemon" option in the host switcher recovers a removed
localhost connection. Old settings/daemon deep links redirect
(COMPAT-tagged).

* fix(settings): hide daemon recovery option when the server id probe fails

Review feedback: !query.isLoading treated an errored IPC probe as
resolved, so the recovery affordance could show without knowing the
local server id. Replace the resolved-boolean hook with a single
discriminated state hook (loading | error | resolved) — errors hide the
affordance and fall back to the settings root in the redirect. Also
collapses the two query subscriptions per caller into one.

* fix(settings): keep daemon recovery reachable when no hosts remain

Review feedback: removing localhost as the only host takes the settings
sidebar down its no-host branch, which never mounts the host picker —
so the "Enable built-in daemon" option was unreachable in the most
common recovery case. The sidebar now owns the single hook call, passes
it to the picker, and renders the same action as a sidebar row next to
"Add host" when no hosts exist.

* test(e2e): update settings host header to Overview

Test drift: the host section's sidebar/header label was intentionally
renamed to "Overview"; the spec still asserted the old "Host" title.
Also assert the retired app-level Daemon row stays absent.

packages/app/src/components/hosts/host-picker-constants.ts

@@ -1,5 +1,6 @@
 export const ADD_HOST_OPTION_ID = "__add_host__";
 export const ALL_HOSTS_OPTION_ID = "__all_hosts__";
+export const ENABLE_BUILT_IN_DAEMON_OPTION_ID = "__enable_built_in_daemon__";
 
 export function getHostPickerLabel(
   hosts: Array<{ label: string; serverId: string }>,

packages/app/src/components/hosts/host-picker.tsx

@@ -11,10 +11,16 @@ import { orderHostsLocalFirst } from "@/types/host-connection";
 import {
   ADD_HOST_OPTION_ID,
   ALL_HOSTS_OPTION_ID,
+  ENABLE_BUILT_IN_DAEMON_OPTION_ID,
   getHostPickerLabel,
 } from "./host-picker-constants";
 
-export { ADD_HOST_OPTION_ID, ALL_HOSTS_OPTION_ID, getHostPickerLabel };
+export {
+  ADD_HOST_OPTION_ID,
+  ALL_HOSTS_OPTION_ID,
+  ENABLE_BUILT_IN_DAEMON_OPTION_ID,
+  getHostPickerLabel,
+};
 
 const SEARCHABLE_THRESHOLD = 10;
 type RenderHostOption = NonNullable<ComboboxProps["renderOption"]>;
@@ -115,6 +121,12 @@ export function HostPickerOption({
   );
 }
 
+const SYSTEM_HOST_PICKER_OPTION_LABELS: Record<"add" | "all" | "enableBuiltInDaemon", string> = {
+  add: "Add host",
+  all: "All hosts",
+  enableBuiltInDaemon: "Enable built-in daemon",
+};
+
 function SystemHostPickerOption({
   active,
   selected,
@@ -125,12 +137,12 @@ function SystemHostPickerOption({
   active: boolean;
   selected?: boolean;
   onPress: () => void;
-  kind: "add" | "all";
+  kind: "add" | "all" | "enableBuiltInDaemon";
   testID?: string;
 }): ReactElement {
   const { theme } = useUnistyles();
   const Icon = kind === "add" ? Plus : Server;
-  const label = kind === "add" ? "Add host" : "All hosts";
+  const label = SYSTEM_HOST_PICKER_OPTION_LABELS[kind];
   const leadingSlot = useMemo(
     () => <Icon size={theme.iconSize.sm} color={theme.colors.foregroundMuted} />,
     [Icon, theme.colors.foregroundMuted, theme.iconSize.sm],
@@ -158,6 +170,8 @@ export interface HostPickerProps {
   includeAllHost?: boolean;
   includeAddHost?: boolean;
   onAddHost?: () => void;
+  includeEnableBuiltInDaemon?: boolean;
+  onEnableBuiltInDaemon?: () => void;
   showActiveConnection?: boolean;
   onOpenHostSettings?: (serverId: string) => void;
   searchable?: boolean;
@@ -179,6 +193,8 @@ export function HostPicker({
   includeAllHost,
   includeAddHost,
   onAddHost,
+  includeEnableBuiltInDaemon,
+  onEnableBuiltInDaemon,
   showActiveConnection,
   onOpenHostSettings,
   searchable,
@@ -199,8 +215,13 @@ export function HostPicker({
     const hostOptions = orderedHosts.map((host) => ({ id: host.serverId, label: host.label }));
     if (includeAllHost) hostOptions.unshift({ id: ALL_HOSTS_OPTION_ID, label: "All hosts" });
     if (includeAddHost) hostOptions.push({ id: ADD_HOST_OPTION_ID, label: "Add host" });
+    if (includeEnableBuiltInDaemon)
+      hostOptions.push({
+        id: ENABLE_BUILT_IN_DAEMON_OPTION_ID,
+        label: "Enable built-in daemon",
+      });
     return hostOptions;
-  }, [orderedHosts, includeAllHost, includeAddHost]);
+  }, [orderedHosts, includeAllHost, includeAddHost, includeEnableBuiltInDaemon]);
 
   const isSearchable = searchable === true && orderedHosts.length > SEARCHABLE_THRESHOLD;
 
@@ -208,12 +229,14 @@ export function HostPicker({
     (id: string) => {
       if (id === ADD_HOST_OPTION_ID) {
         onAddHost?.();
+      } else if (id === ENABLE_BUILT_IN_DAEMON_OPTION_ID) {
+        onEnableBuiltInDaemon?.();
       } else {
         onSelect(id);
       }
       onOpenChange(false);
     },
-    [onAddHost, onOpenChange, onSelect],
+    [onAddHost, onEnableBuiltInDaemon, onOpenChange, onSelect],
   );
 
   const handleOpenHostSettings = useCallback(
@@ -246,6 +269,11 @@ export function HostPicker({
           />
         );
       }
+      if (option.id === ENABLE_BUILT_IN_DAEMON_OPTION_ID) {
+        return (
+          <SystemHostPickerOption kind="enableBuiltInDaemon" active={active} onPress={onPress} />
+        );
+      }
       return (
         <HostPickerOption
           serverId={option.id}