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/contexts/session-workspace-upserts.ts

@@ -1,7 +1,12 @@
 import type { WorkspaceDescriptor } from "@/stores/session-store";
-import { normalizeWorkspaceOpaqueId } from "@/utils/workspace-identity";
+import { normalizeWorkspaceOpaqueId, normalizeWorkspacePath } from "@/utils/workspace-identity";
 
-const pendingWorkspaceArchivesByServer = new Map<string, Set<string>>();
+interface PendingWorkspaceArchive {
+  workspaceId: string;
+  workspaceDirectory: string | null;
+}
+
+const pendingWorkspaceArchivesByServer = new Map<string, Map<string, PendingWorkspaceArchive>>();
 
 function pendingArchiveKey(input: { serverId: string; workspaceId: string }): string {
   return `${input.serverId.trim()}::${input.workspaceId.trim()}`;
@@ -10,6 +15,7 @@ function pendingArchiveKey(input: { serverId: string; workspaceId: string }): st
 export function markWorkspaceArchivePending(input: {
   serverId: string;
   workspaceId: string;
+  workspaceDirectory?: string | null;
 }): void {
   const serverId = input.serverId.trim();
   const workspaceId = normalizeWorkspaceOpaqueId(input.workspaceId);
@@ -17,8 +23,11 @@ export function markWorkspaceArchivePending(input: {
     return;
   }
 
-  const archives = pendingWorkspaceArchivesByServer.get(serverId) ?? new Set<string>();
-  archives.add(pendingArchiveKey({ serverId, workspaceId }));
+  const archives = pendingWorkspaceArchivesByServer.get(serverId) ?? new Map();
+  archives.set(pendingArchiveKey({ serverId, workspaceId }), {
+    workspaceId,
+    workspaceDirectory: normalizeWorkspacePath(input.workspaceDirectory),
+  });
   pendingWorkspaceArchivesByServer.set(serverId, archives);
 }
 
@@ -45,15 +54,34 @@ export function clearWorkspaceArchivePending(input: {
 export function isWorkspaceArchivePending(input: {
   serverId: string;
   workspaceId?: string | null;
+  workspaceDirectory?: string | null;
 }): boolean {
   const serverId = input.serverId.trim();
-  const workspaceId = normalizeWorkspaceOpaqueId(input.workspaceId);
-  if (!serverId || !workspaceId) {
+  if (!serverId) {
     return false;
   }
 
   const archives = pendingWorkspaceArchivesByServer.get(serverId);
-  return archives?.has(pendingArchiveKey({ serverId, workspaceId })) ?? false;
+  if (!archives) {
+    return false;
+  }
+
+  const workspaceId = normalizeWorkspaceOpaqueId(input.workspaceId);
+  if (workspaceId && archives.has(pendingArchiveKey({ serverId, workspaceId }))) {
+    return true;
+  }
+
+  const workspaceDirectory = normalizeWorkspacePath(input.workspaceDirectory);
+  if (!workspaceDirectory) {
+    return false;
+  }
+
+  for (const archive of archives.values()) {
+    if (archive.workspaceDirectory === workspaceDirectory) {
+      return true;
+    }
+  }
+  return false;
 }
 
 export function shouldSuppressWorkspaceForLocalArchive(input: {
@@ -63,5 +91,6 @@ export function shouldSuppressWorkspaceForLocalArchive(input: {
   return isWorkspaceArchivePending({
     serverId: input.serverId,
     workspaceId: input.workspace.id,
+    workspaceDirectory: input.workspace.workspaceDirectory,
   });
 }