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/e2e/settings-navigation.spec.ts

@@ -1,5 +1,10 @@
 import { test, expect } from "./fixtures";
-import { buildHostWorkspaceRoute } from "@/utils/host-routes";
+import {
+  buildHostWorkspaceRoute,
+  buildOpenProjectRoute,
+  buildSettingsRoute,
+  buildSettingsSectionRoute,
+} from "@/utils/host-routes";
 import { gotoAppShell, openSettings } from "./helpers/app";
 import { getE2EDaemonPort } from "./helpers/daemon-port";
 import {
@@ -36,6 +41,7 @@ import {
   removeCurrentHostFromSettings,
 } from "./helpers/settings";
 import { getServerId } from "./helpers/server-id";
+import { expectAppRoute } from "./helpers/route-assertions";
 
 async function openWorkspace(
   page: import("@playwright/test").Page,
@@ -121,7 +127,7 @@ test.describe("Settings — compact master-detail", () => {
 
   test("/settings renders only the sidebar list (no section content)", async ({ page }) => {
     await gotoAppShell(page);
-    await openCompactSettings(page);
+    await openCompactSettings(page, buildOpenProjectRoute());
 
     await expectSettingsSidebarSections(page, ["general", "diagnostics", "about"]);
     await expectCompactSettingsList(page);
@@ -133,10 +139,10 @@ test.describe("Settings — compact master-detail", () => {
 
   test("tapping a section pushes /settings/[section] and shows a back button", async ({ page }) => {
     await gotoAppShell(page);
-    await openCompactSettings(page);
+    await openCompactSettings(page, buildOpenProjectRoute());
 
     await openSettingsSection(page, "diagnostics");
-    await expect(page).toHaveURL(/\/settings\/diagnostics$/);
+    await expectAppRoute(page, buildSettingsSectionRoute("diagnostics"));
     await expectDiagnosticsContent(page);
     await expectSettingsSidebarHidden(page);
     await expectSettingsBackButton(page);
@@ -144,10 +150,10 @@ test.describe("Settings — compact master-detail", () => {
 
   test("back from a section detail returns to the /settings list", async ({ page }) => {
     await gotoAppShell(page);
-    await openCompactSettings(page);
+    await openCompactSettings(page, buildOpenProjectRoute());
 
     await openSettingsSection(page, "about");
-    await expect(page).toHaveURL(/\/settings\/about$/);
+    await expectAppRoute(page, buildSettingsSectionRoute("about"));
 
     await goBackInSettings(page);
     await expectCompactSettingsList(page);
@@ -158,7 +164,7 @@ test.describe("Settings — compact master-detail", () => {
     page,
   }) => {
     await gotoAppShell(page);
-    await openCompactSettings(page);
+    await openCompactSettings(page, buildOpenProjectRoute());
 
     await openCompactSettingsHost(page);
     await expectSettingsBackButton(page);
@@ -167,11 +173,11 @@ test.describe("Settings — compact master-detail", () => {
 
   test("back from a host detail returns to the /settings list", async ({ page }) => {
     await gotoAppShell(page);
-    await openCompactSettings(page);
+    await openCompactSettings(page, buildOpenProjectRoute());
 
     await openCompactSettingsHost(page);
     await goBackInSettings(page);
-    await expect(page).toHaveURL(/\/settings$/);
+    await expectAppRoute(page, buildSettingsRoute());
     await expectSettingsSidebarVisible(page);
   });
 
@@ -188,11 +194,11 @@ test.describe("Settings — compact master-detail", () => {
       { serverId: secondaryServerId, label: secondaryHostLabel, endpoint },
     ]);
     await gotoAppShell(page);
-    await openCompactSettings(page);
+    await openCompactSettings(page, buildOpenProjectRoute());
 
     await selectSettingsHost(page, secondaryServerId);
 
-    await expect(page).toHaveURL(/\/settings$/);
+    await expectAppRoute(page, buildSettingsRoute());
     await expectSettingsSidebarVisible(page);
     await expectSettingsHostPickerLabel(page, secondaryHostLabel);
 
@@ -206,7 +212,7 @@ test.describe("Settings — compact master-detail", () => {
     const workspace = await withWorkspace({ prefix: "remove-host-compact-" });
 
     await openWorkspace(page, workspace);
-    await openCompactSettings(page);
+    await openCompactSettings(page, buildHostWorkspaceRoute(getServerId(), workspace.workspaceId));
     await openSettingsHostSection(page, getServerId(), "host");
     await removeCurrentHostFromSettings(page);
     await closeCompactSettings(page);