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/workspace/workspace-archive.test.ts

@@ -12,6 +12,7 @@ import {
 } from "@/workspace/workspace-archive";
 
 const SERVER_ID = "workspace-archive-test";
+const SECOND_SERVER_ID = "workspace-archive-test-2";
 
 type ArchiveWorkspacePayload = Awaited<ReturnType<DaemonClient["archiveWorkspace"]>>;
 
@@ -75,8 +76,12 @@ function deferred<T>(): {
   return { promise, resolve, reject };
 }
 
+function storedWorkspaceOn(serverId: string, id: string): WorkspaceDescriptor | undefined {
+  return useSessionStore.getState().sessions[serverId]?.workspaces.get(id);
+}
+
 function storedWorkspace(id: string): WorkspaceDescriptor | undefined {
-  return useSessionStore.getState().sessions[SERVER_ID]?.workspaces.get(id);
+  return storedWorkspaceOn(SERVER_ID, id);
 }
 
 beforeEach(() => {
@@ -86,6 +91,8 @@ beforeEach(() => {
 afterEach(() => {
   clearWorkspaceArchivePending({ serverId: SERVER_ID, workspaceId: "workspace-1" });
   clearWorkspaceArchivePending({ serverId: SERVER_ID, workspaceId: "workspace-2" });
+  clearWorkspaceArchivePending({ serverId: SECOND_SERVER_ID, workspaceId: "workspace-1" });
+  clearWorkspaceArchivePending({ serverId: SECOND_SERVER_ID, workspaceId: "workspace-2" });
   useSessionStore.setState((state) => ({ ...state, sessions: {} }));
 });
 
@@ -175,8 +182,11 @@ describe("archiveWorkspacesOptimistically", () => {
     );
 
     const failures = await archiveWorkspacesOptimistically({
-      client,
-      workspaces: [target({ workspaceId: first.id }), target({ workspaceId: second.id })],
+      getClient: () => client,
+      workspaces: [
+        target({ workspaceId: first.id, workspaceDirectory: first.workspaceDirectory }),
+        target({ workspaceId: second.id, workspaceDirectory: second.workspaceDirectory }),
+      ],
     });
 
     expect(failures).toHaveLength(1);
@@ -184,4 +194,49 @@ describe("archiveWorkspacesOptimistically", () => {
     expect(storedWorkspace(first.id)).toBeUndefined();
     expect(storedWorkspace(second.id)).toEqual(second);
   });
+
+  it("archives each workspace through its own server client", async () => {
+    const first = workspace({ id: "workspace-1" });
+    const second = workspace({
+      id: "workspace-2",
+      workspaceDirectory: "/repo/project/workspace-2",
+      name: "workspace-2",
+    });
+    useSessionStore.getState().initializeSession(SECOND_SERVER_ID, {} as DaemonClient);
+    useSessionStore.getState().mergeWorkspaces(SERVER_ID, [first]);
+    useSessionStore.getState().mergeWorkspaces(SECOND_SERVER_ID, [second]);
+
+    const archivedByServer = new Map<string, string[]>();
+    const clientFor = (serverId: string) =>
+      createClient(async (workspaceId) => {
+        archivedByServer.set(serverId, [...(archivedByServer.get(serverId) ?? []), workspaceId]);
+        return archivePayload({ workspaceId });
+      });
+
+    const failures = await archiveWorkspacesOptimistically({
+      getClient: (serverId) => clientFor(serverId),
+      workspaces: [
+        target({
+          serverId: SERVER_ID,
+          workspaceId: first.id,
+          workspaceDirectory: first.workspaceDirectory,
+        }),
+        target({
+          serverId: SECOND_SERVER_ID,
+          workspaceId: second.id,
+          workspaceDirectory: second.workspaceDirectory,
+        }),
+      ],
+    });
+
+    expect(failures).toEqual([]);
+    expect(archivedByServer).toEqual(
+      new Map([
+        [SERVER_ID, [first.id]],
+        [SECOND_SERVER_ID, [second.id]],
+      ]),
+    );
+    expect(storedWorkspaceOn(SERVER_ID, first.id)).toBeUndefined();
+    expect(storedWorkspaceOn(SECOND_SERVER_ID, second.id)).toBeUndefined();
+  });
 });