feat(renderer): add FirstRunWizard with theme/channel/template steps

src/renderer/components/FirstRunWizard.tsx

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+import { useState } from 'react';
+import { useAppStore } from '@/stores/app-store';
+import { useSettingsStore } from '@/stores/settings-store';
+
+const TEMPLATES = {
+  blank: '',
+  readme: '# Project\n\nDescription.\n\n## Usage\n\n```\nnpm install\n```\n',
+  meeting: '# Meeting Notes — YYYY-MM-DD\n\n## Attendees\n\n- \n## Agenda\n\n1. \n\n## Action items\n\n- [ ] \n',
+  blog: '# Title\n\n*Subtitle*\n\nLorem ipsum.\n\n---\n\n## Section 1\n',
+};
+
+export function FirstRunWizard() {
+  const firstRun = useAppStore((s) => s.firstRun);
+  const setFirstRun = useAppStore((s) => s.setFirstRun);
+  const theme = useSettingsStore((s) => s.theme);
+  const setSetting = useSettingsStore((s) => s.setSetting);
+  const updateChannel = useSettingsStore((s) => s.updateChannel);
+  const [step, setStep] = useState(0);
+  const [template, setTemplate] = useState<keyof typeof TEMPLATES>('blank');
+
+  if (!firstRun) return null;
+
+  const close = () => setFirstRun(false);
+
+  return (
+    <div data-testid="first-run-wizard" role="dialog" aria-modal="true" className="fixed inset-0 z-50 bg-black/40 flex items-center justify-center">
+      <div className="bg-white dark:bg-neutral-900 rounded-lg p-6 w-[28rem] shadow-xl">
+        {step === 0 && (
+          <div>
+            <h2 className="text-lg font-semibold mb-2">Pick a theme</h2>
+            <div className="flex gap-2 mb-4">
+              {(['light', 'dark', 'system'] as const).map((t) => (
+                <label key={t} className="flex items-center gap-1">
+                  <input type="radio" name="theme" checked={theme === t} onChange={() => setSetting('theme', t)} />
+                  {t}
+                </label>
+              ))}
+            </div>
+          </div>
+        )}
+        {step === 1 && (
+          <div>
+            <h2 className="text-lg font-semibold mb-2">Update channel</h2>
+            <div className="flex flex-col gap-2 mb-4">
+              <label className="flex items-center gap-2">
+                <input type="radio" name="channel" checked={updateChannel === 'github'} onChange={() => setSetting('updateChannel', 'github')} />
+                GitHub Releases (public)
+              </label>
+              <label className="flex items-center gap-2">
+                <input type="radio" name="channel" checked={updateChannel === 'concreteinfo'} onChange={() => setSetting('updateChannel', 'concreteinfo')} />
+                ConcreteInfo self-hosted
+              </label>
+            </div>
+          </div>
+        )}
+        {step === 2 && (
+          <div>
+            <h2 className="text-lg font-semibold mb-2">Starter template</h2>
+            <select value={template} onChange={(e) => setTemplate(e.target.value as any)} className="border rounded px-2 py-1 w-full mb-4">
+              <option value="blank">Blank</option>
+              <option value="readme">README</option>
+              <option value="meeting">Meeting notes</option>
+              <option value="blog">Blog post</option>
+            </select>
+          </div>
+        )}
+        <div className="flex justify-between items-center mt-4">
+          <button onClick={close} className="text-sm text-neutral-500">Skip</button>
+          <div className="flex gap-2">
+            {step > 0 && <button onClick={() => setStep(step - 1)}>Back</button>}
+            {step < 2 ? (
+              <button onClick={() => setStep(step + 1)} className="px-3 py-1 rounded bg-brand text-white">Next</button>
+            ) : (
+              <button onClick={() => { useAppStore.getState().newBuffer(TEMPLATES[template]); close(); }} className="px-3 py-1 rounded bg-brand text-white">Done</button>
+            )}
+          </div>
+        </div>
+      </div>
+    </div>
+  );
+}

tests/component/FirstRunWizard.test.tsx

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+import { describe, expect, test, beforeEach, vi } from 'vitest';
+import { render, screen, fireEvent } from '@testing-library/react';
+import { useAppStore } from '@/stores/app-store';
+import { useSettingsStore } from '@/stores/settings-store';
+import { FirstRunWizard } from '@/components/FirstRunWizard';
+
+beforeEach(() => {
+  useAppStore.setState({ firstRun: true, modal: { kind: null } } as any);
+  useSettingsStore.setState({ theme: 'system', updateChannel: 'github' } as any);
+});
+
+describe('FirstRunWizard', () => {
+  test('renders nothing when firstRun is false', () => {
+    useAppStore.setState({ firstRun: false } as any);
+    const { container } = render(<FirstRunWizard />);
+    expect(container.firstChild).toBeNull();
+  });
+
+  test('renders step 1 by default', () => {
+    render(<FirstRunWizard />);
+    expect(screen.getByText(/theme/i)).toBeInTheDocument();
+  });
+
+  test('skip link closes the wizard and sets firstRun false', () => {
+    render(<FirstRunWizard />);
+    fireEvent.click(screen.getByText(/skip/i));
+    expect(useAppStore.getState().firstRun).toBe(false);
+  });
+
+  test('selecting a theme and clicking Next moves to step 2', () => {
+    render(<FirstRunWizard />);
+    fireEvent.click(screen.getByLabelText(/dark/i));
+    fireEvent.click(screen.getByText(/next/i));
+    expect(useSettingsStore.getState().theme).toBe('dark');
+  });
+
+  test('selecting concreteinfo channel persists it', () => {
+    render(<FirstRunWizard />);
+    fireEvent.click(screen.getByText(/next/i));
+    fireEvent.click(screen.getByLabelText(/concreteinfo/i));
+    fireEvent.click(screen.getByText(/next/i));
+    expect(useSettingsStore.getState().updateChannel).toBe('concreteinfo');
+  });
+});