feat(FN-2154): show dismissible setup warning on project page

- Render SetupWarningBanner from App only in project view when setup readiness reports warnings
- Persist dismiss state per project via scoped storage and restore it when switching projects
- Add optional dismiss action to SetupWarningBanner with close button UI and responsive styles
- Remove inline banner from QuickEntryBox and add tests covering dismiss button behavior

packages/dashboard/app/components/__tests__/SetupWarningBanner.test.tsx

@@ -1,5 +1,5 @@
-import { describe, it, expect } from "vitest";
-import { render, screen } from "@testing-library/react";
+import { describe, it, expect, vi } from "vitest";
+import { fireEvent, render, screen } from "@testing-library/react";
 import { SetupWarningBanner } from "../SetupWarningBanner";
 
 describe("SetupWarningBanner", () => {
@@ -71,4 +71,69 @@ describe("SetupWarningBanner", () => {
     const banner = screen.getByRole("status");
     expect(banner).toHaveAttribute("aria-live", "polite");
   });
+
+  it("does not render dismiss button when onDismiss is not provided", () => {
+    render(<SetupWarningBanner hasAiProvider={false} hasGithub />);
+
+    expect(
+      screen.queryByRole("button", { name: "Dismiss setup warning" }),
+    ).toBeNull();
+  });
+
+  it("renders dismiss button when onDismiss is provided (full mode)", () => {
+    const onDismiss = vi.fn();
+
+    render(
+      <SetupWarningBanner
+        hasAiProvider={false}
+        hasGithub
+        onDismiss={onDismiss}
+      />,
+    );
+
+    const dismissButton = screen.getByRole("button", {
+      name: "Dismiss setup warning",
+    });
+    expect(dismissButton).toBeInTheDocument();
+
+    fireEvent.click(dismissButton);
+    expect(onDismiss).toHaveBeenCalledTimes(1);
+  });
+
+  it("renders dismiss button when onDismiss is provided (compact mode)", () => {
+    const onDismiss = vi.fn();
+
+    render(
+      <SetupWarningBanner
+        hasAiProvider={false}
+        hasGithub
+        compact
+        onDismiss={onDismiss}
+      />,
+    );
+
+    const dismissButton = screen.getByRole("button", {
+      name: "Dismiss setup warning",
+    });
+    expect(dismissButton).toBeInTheDocument();
+
+    fireEvent.click(dismissButton);
+    expect(onDismiss).toHaveBeenCalledTimes(1);
+  });
+
+  it("clicking dismiss button calls onDismiss", () => {
+    const onDismiss = vi.fn();
+
+    render(
+      <SetupWarningBanner
+        hasAiProvider={false}
+        hasGithub={false}
+        onDismiss={onDismiss}
+      />,
+    );
+
+    fireEvent.click(screen.getByRole("button", { name: "Dismiss setup warning" }));
+
+    expect(onDismiss).toHaveBeenCalledTimes(1);
+  });
 });