feat: per host layout for the terminal panel bar

src/ui/tests/shell/companions.test.tsx

@@ -2,9 +2,12 @@ import { afterEach, describe, expect, it } from "vitest";
 import { act, fireEvent, render, screen } from "@testing-library/react";
 import type { Tab } from "@/types/ui-types";
 import {
+  arrangeCompanions,
   companionApplies,
   getCompanionState,
   registerCompanionDef,
+  registerCompanionLayoutDef,
+  resetCompanionLayouts,
   resetCompanions,
   resetCompanionStates,
   toggleCompanion,
@@ -74,3 +77,35 @@ describe("companions", () => {
     expect(getCompanionState("t1").openId).toBeNull();
   });
 });
+
+describe("companion layout", () => {
+  it("hides a companion and the whole bar by host layout", () => {
+    registerCompanionLayoutDef({
+      id: "layout",
+      tabTypes: ["terminal"],
+      resolve: (host) =>
+        (host as unknown as { off?: boolean }).off
+          ? { enabled: false }
+          : { hidden: ["b"] },
+    });
+    const a = { id: "a", component: () => null };
+    const b = { id: "b", component: () => null };
+    expect(companionApplies(a, tab())).toBe(true);
+    expect(companionApplies(b, tab())).toBe(false);
+    expect(
+      companionApplies(a, tab({ host: { id: 1, off: true } as never })),
+    ).toBe(false);
+    resetCompanionLayouts();
+    expect(companionApplies(b, tab())).toBe(true);
+  });
+
+  it("orders by the saved list and keeps unknown ones after", () => {
+    const defs = [{ id: "a" }, { id: "b" }, { id: "c" }];
+    expect(arrangeCompanions(defs, ["c", "a"]).map((d) => d.id)).toEqual([
+      "c",
+      "a",
+      "b",
+    ]);
+    expect(arrangeCompanions(defs, undefined)).toBe(defs);
+  });
+});