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/helpers/settings.ts

@@ -1,7 +1,13 @@
 import { expect, type Page } from "@playwright/test";
 import { buildCreateAgentPreferences, buildSeededHost, TEST_HOST_LABEL } from "./daemon-registry";
-import { escapeRegex } from "./regex";
 import { getServerId } from "./server-id";
+import { expectAppRoute } from "./route-assertions";
+import {
+  buildProjectsSettingsRoute,
+  buildSettingsHostSectionRoute,
+  buildSettingsRoute,
+  buildSettingsSectionRoute,
+} from "@/utils/host-routes";
 
 const DISABLE_DEFAULT_SEED_ONCE_KEY = "@paseo:e2e-disable-default-seed-once";
 const SEED_NONCE_KEY = "@paseo:e2e-seed-nonce";
@@ -33,12 +39,12 @@ export async function openSettingsSection(page: Page, section: SettingsSection):
 
   if (section === "projects") {
     await page.getByTestId("settings-projects").click();
-    await expect(page).toHaveURL(/\/settings\/projects$/);
+    await expectAppRoute(page, buildProjectsSettingsRoute());
     return;
   }
 
   await sidebar.getByRole("button", { name: SECTION_LABELS[section], exact: true }).click();
-  await expect(page).toHaveURL(new RegExp(`/settings/${section}$`));
+  await expectAppRoute(page, buildSettingsSectionRoute(section));
 }
 
 export async function openSettingsHost(page: Page, serverId: string): Promise<void> {
@@ -55,9 +61,7 @@ export async function openSettingsHostSection(
   section: HostSection,
 ): Promise<void> {
   await page.getByTestId(`settings-host-section-${section}`).click();
-  await expect(page).toHaveURL(
-    new RegExp(`/settings/hosts/${escapeRegex(encodeURIComponent(serverId))}/${section}$`),
-  );
+  await expectAppRoute(page, buildSettingsHostSectionRoute(serverId, section));
 }
 
 export async function expectSettingsHeader(page: Page, title: string): Promise<void> {
@@ -84,13 +88,13 @@ export async function toggleHostAdvanced(page: Page): Promise<void> {
   await page.getByTestId("direct-host-advanced-toggle").click();
 }
 
-export async function openCompactSettings(page: Page): Promise<void> {
-  await expect(page).toHaveURL(/\/h\/|\/welcome/, { timeout: 15000 });
+export async function openCompactSettings(page: Page, expectedStartRoute: string): Promise<void> {
+  await expectAppRoute(page, expectedStartRoute, { timeout: 15_000 });
   await page.getByRole("button", { name: "Open menu", exact: true }).first().click();
   const settingsButton = page.locator('[data-testid="sidebar-settings"]:visible').first();
   await expect(settingsButton).toBeVisible();
   await settingsButton.click();
-  await expect(page).toHaveURL(/\/settings$/);
+  await expectAppRoute(page, buildSettingsRoute());
   await expect(page.getByTestId("settings-sidebar")).toBeVisible();
 }
 
@@ -149,7 +153,7 @@ export async function expectSettingsHostPickerLabel(page: Page, label: string):
 }
 
 export async function expectCompactSettingsList(page: Page): Promise<void> {
-  await expect(page).toHaveURL(/\/settings$/);
+  await expectAppRoute(page, buildSettingsRoute());
   await expect(page.getByTestId("settings-sidebar")).toBeVisible();
   await expect(page.getByText("Theme", { exact: true })).toHaveCount(0);
   await expect(page.getByRole("button", { name: "Play test" })).toHaveCount(0);
@@ -189,7 +193,7 @@ export async function removeCurrentHostFromSettings(page: Page): Promise<void> {
   await page.getByTestId("host-page-remove-host-button").click();
   await expect(page.getByTestId("remove-host-confirm-modal")).toBeVisible();
   await page.getByTestId("remove-host-confirm").click();
-  await expect(page).toHaveURL(/\/settings$/);
+  await expectAppRoute(page, buildSettingsRoute());
 }
 
 export async function expectSettingsBackButton(page: Page): Promise<void> {
@@ -201,9 +205,7 @@ export async function clickSettingsBackToWorkspace(page: Page): Promise<void> {
 }
 
 export async function expectHostSettingsUrl(page: Page, serverId: string): Promise<void> {
-  await expect(page).toHaveURL(
-    new RegExp(`/settings/hosts/${escapeRegex(encodeURIComponent(serverId))}/connections$`),
-  );
+  await expectAppRoute(page, buildSettingsHostSectionRoute(serverId, "connections"));
 }
 
 export async function verifyLegacyHostSettingsRedirect(page: Page): Promise<void> {