Improve sidebar workspace readability and host identity (#2790)

* fix(app): align turn footer actions

Keep running-turn actions in the same position as completed-turn actions and use the shared small icon size for both copy and fork controls.

* feat(app): improve sidebar workspace identity

Make dense sidebar workspace rows easier to scan and let each device control how connected hosts are identified.

* fix(app): keep host badges readable

Use a compact display menu and keep identity color on the host icon so translated controls fit and badge text retains standard contrast.

* fix(app): announce selected sidebar badge mode

* fix(app): retain icon-only host names for screen readers

* fix(app): name hoisted workspace rows

* fix(app): retain host identity in workspace labels

* fix(app): retain workspace status in row labels

* fix(app): defer host appearance until identity resolves

* fix(app): serialize host appearance writes

* fix(app): serialize host registry writes

* fix(app): bound sidebar host badge labels

* test(app): match workspace status labels

* fix(app): consolidate sidebar identity behavior

* test(app): assert status grouping behavior

* fix(app): keep sidebar row actions accessible

* fix(app): stabilize optimistic message layout

packages/app/e2e/browser/sidebar-model-b.spec.ts

@@ -149,6 +149,12 @@ test.describe("Model B sidebar shape", () => {
       await expect(workspaceRow(page, activeMock.workspaceId).first()).toBeVisible({
         timeout: 60_000,
       });
+      await expect(workspaceRow(page, idleProject.workspaceId).first()).toHaveAccessibleName(
+        `${idleProject.projectDisplayName}, ${idleProject.workspaceName}`,
+      );
+      await expect(workspaceRow(page, activeMock.workspaceId).first()).toHaveAccessibleName(
+        /Working$/,
+      );
 
       // Only workspace rows are shown — no tab/agent/terminal leaves leak into
       // the status view.