feat(project): per-project new-chat defaults (agent, workspace, approval, thinking, model) (#191)

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

packages/web/test/esc-layers.test.ts

@@ -0,0 +1,34 @@
+/**
+ * Escape-layer stack (components/ui/modal.tsx): modals AND Dropdown menus register as
+ * layers, and Escape only acts on the topmost one. This is what makes one Escape close a
+ * menu opened inside a dialog while the dialog stays up (the next Escape closes it), and
+ * keeps nested dialogs closing one at a time.
+ */
+import { describe, expect, it } from "vitest";
+import { isTopEscLayer, popEscLayer, pushEscLayer } from "../src/components/ui/modal";
+
+describe("esc layer stack", () => {
+  it("only the topmost layer may act; popping restores the one below", () => {
+    const modal = pushEscLayer();
+    expect(isTopEscLayer(modal)).toBe(true);
+    // A menu opened inside the modal stacks above it: the first Escape belongs to the menu.
+    const menu = pushEscLayer();
+    expect(isTopEscLayer(menu)).toBe(true);
+    expect(isTopEscLayer(modal)).toBe(false);
+    popEscLayer(menu);
+    expect(isTopEscLayer(modal)).toBe(true);
+    popEscLayer(modal);
+    expect(isTopEscLayer(modal)).toBe(false);
+  });
+
+  it("tolerates out-of-order removal (an outer layer unmounting first)", () => {
+    const outer = pushEscLayer();
+    const inner = pushEscLayer();
+    popEscLayer(outer); // e.g. the host dialog unmounts while its menu is still open
+    expect(isTopEscLayer(inner)).toBe(true);
+    popEscLayer(inner);
+    // Double-pop is a no-op, never a throw (effect cleanups can race in tests/strict mode).
+    popEscLayer(inner);
+    expect(isTopEscLayer(inner)).toBe(false);
+  });
+});