Merge sidebar workspaces across all connected hosts (#1538)

* Merge workspaces across all hosts in the sidebar

Replace per-host sidebar sections with a single merged project list.
Projects that exist on multiple hosts (matched by projectKey) are
collapsed into one row. Host identity is surfaced via:

- A status-only footer pill showing online/offline host counts
- Hover cards with a mandatory host row on every workspace entry
- Subtitles showing the host name when a project spans >1 host
- A host filter in the grouping dropdown (not a sidebar switcher)

Order and group-mode stores migrated from per-server to global keys
with zustand persist migrations. New-workspace screen now shows a
merged project list with a host selector combobox.

Key files:
- workspace-structure.ts: merge algorithm by projectKey
- sidebar-view-store.ts / sidebar-order-store.ts: global state
- sidebar-workspace-list.tsx: context-based subtitle injection
- new-workspace-screen.tsx: host selector in footer row

* Add host filtering to the merged sidebar

The sidebar now merges workspaces from every connected host, so a single
global "active host" no longer fits. Host selection becomes explicit per
action via a host chooser, and agent history pages across all hosts at
once. Removes the active-host / active-server-id model and the
all-agents-list hook that fed it.

* Fix rebase fallout: translate archive host error, update stale workspace-key test

archiveWorkspacesOptimistically used a raw "Host is not connected" string
that the i18n completeness test forbids; route it through i18n.t with the
existing hostDisconnected key. The selectors memoization test asserted
un-prefixed workspace keys, but merged-sidebar keys are serverId-prefixed.

* Fix sidebar review fallout

* Address sidebar review followups

* Fix sidebar workspace identity migration

* Address sidebar review followups

* Handle partial host history failures

* Fix merged sidebar project removal and E2E drift

* Restore history routes and project removal shape

* Remove sidebar host context plumbing

* Tighten sidebar status and host filter state

* Keep new workspace project selection host-compatible

* Migrate sidebar view storage

* Streamline host selection flows

* Update all-host history on archive

* Fix empty project sidebar action

Code regression: the main merge dropped the empty-project New workspace child row while keeping the empty project persistence contract. Restore the row using the project host target so the sidebar stays aligned with the no-host-selection model.

* Fix Japanese shortcut translation key

Stale-base integration: main added the Japanese locale after this branch added cycleAgentMode to the English shortcut help map. Merging main exposed the missing ja key in CI typecheck and resources.test.

* Fix Playwright speech teardown race

packages/app/src/components/workspace-hover-card.tsx

@@ -39,6 +39,8 @@ import { useHoverSafeZone } from "@/hooks/use-hover-safe-zone";
 import { useIsCompactFormFactor } from "@/constants/layout";
 import { FloatingSurface } from "@/components/ui/floating";
 import { isWeb } from "@/constants/platform";
+import { useHosts, useHostRuntimeSnapshot } from "@/runtime/host-runtime";
+import { formatConnectionStatus } from "@/utils/daemons";
 
 interface Rect {
   x: number;
@@ -284,6 +286,7 @@ function WorkspaceHoverCardContent({
               {workspace.name}
             </Text>
           </View>
+          <HostRow serverId={workspace.serverId} />
           {workspace.currentBranch ? (
             <CopyableInfoRow
               icon={ThemedGitBranch}
@@ -327,6 +330,22 @@ function WorkspaceHoverCardContent({
 
 const ThemedGitBranch = withUnistyles(GitBranch);
 const ThemedFolder = withUnistyles(Folder);
+
+function HostRow({ serverId }: { serverId: string }): ReactElement | null {
+  const hosts = useHosts();
+  const host = hosts.find((h) => h.serverId === serverId);
+  const snapshot = useHostRuntimeSnapshot(serverId);
+  const label = host?.label?.trim() || serverId;
+  const status = formatConnectionStatus(snapshot?.connectionStatus ?? "idle");
+
+  return (
+    <View style={styles.hostRow}>
+      <Text style={styles.hostRowLabel}>{label}</Text>
+      <Text style={styles.hostRowStatus}>{status}</Text>
+    </View>
+  );
+}
+
 const ThemedExternalLink = withUnistyles(ExternalLink);
 const ThemedGitHubIcon = withUnistyles(GitHubIcon);
 const ThemedCircleCheck = withUnistyles(CircleCheck);
@@ -548,6 +567,22 @@ const styles = StyleSheet.create((theme) => ({
     flex: 1,
     minWidth: 0,
   },
+  hostRow: {
+    flexDirection: "row",
+    alignItems: "center",
+    justifyContent: "space-between",
+    gap: theme.spacing[2],
+    paddingHorizontal: theme.spacing[3],
+    paddingBottom: theme.spacing[2],
+  },
+  hostRowLabel: {
+    fontSize: theme.fontSize.xs,
+    color: theme.colors.foregroundMuted,
+  },
+  hostRowStatus: {
+    fontSize: theme.fontSize.xs,
+    color: theme.colors.foregroundMuted,
+  },
   cardMetaRow: {
     flexDirection: "row",
     alignItems: "center",