Gate Unilateral Exit behind developer mode

src/pages/SettingsPage.test.tsx

@@ -0,0 +1,50 @@
+import { afterEach, describe, expect, it, vi } from 'vitest';
+import { render, screen } from '@testing-library/react';
+import type { BreezSdk } from '@breeztech/breez-sdk-spark';
+import { WalletProvider } from '@/contexts/WalletContext';
+import { ToastProvider } from '@/contexts/ToastContext';
+import { createMockClient } from '@/test/mocks/mockWalletApi';
+import { setDevMode } from '@/services/settings';
+import SettingsPage from './SettingsPage';
+
+const renderSettings = () => render(
+  <ToastProvider>
+  <WalletProvider client={createMockClient() as unknown as BreezSdk} isConnected>
+  <SettingsPage
+    onBack={vi.fn()}
+    config={null}
+    onOpenFiatCurrencies={vi.fn()}
+    onOpenBuyProviders={vi.fn()}
+    onOpenPasskeySettings={vi.fn()}
+    onOpenSecurity={vi.fn()}
+    onOpenBackup={vi.fn()}
+    onOpenUnilateralExit={vi.fn()}
+  />
+  </WalletProvider>
+  </ToastProvider>
+);
+
+// `vite.config.ts` defines this at build time, so the version line has nothing
+// to read under vitest.
+vi.stubGlobal('__APP_VERSION__', '0.0.0-test');
+
+afterEach(() => {
+  setDevMode(false);
+  localStorage.clear();
+});
+
+describe('unilateral exit on the settings page', () => {
+  it('is not offered without dev mode', () => {
+    setDevMode(false);
+    renderSettings();
+
+    expect(screen.queryByTestId('settings-unilateral-exit')).toBeNull();
+  });
+
+  it('is offered with dev mode on', () => {
+    setDevMode(true);
+    renderSettings();
+
+    expect(screen.getByTestId('settings-unilateral-exit')).toBeInTheDocument();
+  });
+});

src/pages/SettingsPage.tsx

@@ -450,6 +450,12 @@ const SettingsPage: React.FC<SettingsPageProps> = ({
             </div>
           )}
 
+          {/* Dev mode only: this is what you reach for if Spark stops operating,
+              not a feature, and starting one moves the whole balance on-chain
+              at the cost of mining fees. An exit already running stays on the
+              transaction list either way, so nothing in flight is stranded by
+              turning dev mode back off. */}
+          {isDevMode && (
           <div className="bg-spark-dark border border-spark-border rounded-2xl p-4">
             <h3 className="font-display font-semibold text-spark-text-primary mb-1">Unilateral Exit</h3>
             <p className="text-sm text-spark-text-muted mb-3">
@@ -475,6 +481,7 @@ const SettingsPage: React.FC<SettingsPageProps> = ({
               Use this only if Spark stops operating. This is a last-resort action.
             </p>
           </div>
+          )}
 
           {/* Account deletion (App Store 5.1.1(v)): opens the guide
               explaining how to delete the account (logout wipes the