Phase 9: onboarding, mobile & accessibility

- First-run welcome on the Campaigns page: what-the-app-is blurb, three feature
  highlights, and one-click "Try the sample campaign" (seedSampleCampaign) plus
  "Start your first campaign".
- Map token palette starts collapsed on small screens so the map gets the width.
- (Reduced-motion is already honoured globally in styles/globals.css.)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

e2e/onboarding.spec.ts

@@ -0,0 +1,16 @@
+import { test, expect } from '@playwright/test';
+
+test.beforeEach(async ({ page }) => {
+  await page.goto('/');
+  await page.evaluate(async () => {
+    indexedDB.deleteDatabase('ttrpg-manager');
+    localStorage.clear();
+  });
+  await page.reload();
+});
+
+test('onboarding: first-run welcome loads the sample campaign', async ({ page }) => {
+  await expect(page.getByRole('heading', { name: 'Welcome to TTRPG Manager' })).toBeVisible();
+  await page.getByRole('button', { name: 'Try the sample campaign' }).click();
+  await expect(page.getByRole('heading', { name: 'Sample: Lost Mine' })).toBeVisible();
+});

src/features/campaigns/CampaignsPage.tsx

@@ -1,11 +1,12 @@
 import { useState } from 'react';
 import { useNavigate } from '@tanstack/react-router';
 import { campaignsRepo } from '@/lib/db/repositories';
+import { seedSampleCampaign } from '@/lib/sample';
 import { SYSTEM_OPTIONS } from '@/lib/rules';
 import { useUiStore } from '@/stores/uiStore';
 import { useCampaigns } from './hooks';
 import type { Campaign } from '@/lib/schemas';
-import { Page, PageHeader, EmptyState } from '@/components/ui/Page';
+import { Page, PageHeader } from '@/components/ui/Page';
 import { Button } from '@/components/ui/Button';
 import { Modal } from '@/components/ui/Modal';
 import { Field, Input, Select, Textarea } from '@/components/ui/Input';
@@ -28,15 +29,7 @@ export function CampaignsPage() {
       />
 
       {campaigns.length === 0 ? (
-        <EmptyState
-          title="No campaigns yet"
-          hint="Create your first campaign to start tracking characters and combat."
-          action={
-            <Button variant="primary" onClick={() => setCreating(true)}>
-              + New campaign
-            </Button>
-          }
-        />
+        <Welcome onCreate={() => setCreating(true)} />
       ) : (
         <div className="grid gap-3 sm:grid-cols-2 lg:grid-cols-3">
           {campaigns.map((c) => (
@@ -51,6 +44,47 @@ export function CampaignsPage() {
   );
 }
 
+function Welcome({ onCreate }: { onCreate: () => void }) {
+  const navigate = useNavigate();
+  const setActive = useUiStore((s) => s.setActiveCampaign);
+  const [loading, setLoading] = useState(false);
+  const loadSample = async () => {
+    setLoading(true);
+    const id = await seedSampleCampaign();
+    setActive(id);
+    void navigate({ to: '/dashboard' });
+  };
+  return (
+    <div className="mx-auto max-w-2xl rounded-xl border border-line bg-panel p-6 text-center">
+      <h2 className="font-display text-2xl font-bold text-accent">Welcome to TTRPG Manager</h2>
+      <p className="mx-auto mt-2 max-w-xl text-sm text-muted">
+        A local-first companion for D&amp;D 5e &amp; Pathfinder 2e — guided character building, combat
+        tracking, a full battle-map VTT with fog &amp; dynamic vision, a searchable compendium, and live
+        play your players join from their own devices. Everything is stored on this device.
+      </p>
+      <div className="mt-4 grid gap-2 text-left sm:grid-cols-3">
+        <FeatCard icon="🧙" title="Build characters" desc="A friendly, data-driven builder for new players." />
+        <FeatCard icon="🗺️" title="Run battle maps" desc="Fog, line-of-sight vision, tokens, .dd2vtt import." />
+        <FeatCard icon="📡" title="Play live" desc="Host a room; players manage their own character." />
+      </div>
+      <div className="mt-5 flex flex-wrap items-center justify-center gap-2">
+        <Button variant="primary" onClick={onCreate}>Start your first campaign</Button>
+        <Button variant="secondary" disabled={loading} onClick={() => void loadSample()}>{loading ? 'Loading…' : 'Try the sample campaign'}</Button>
+      </div>
+    </div>
+  );
+}
+
+function FeatCard({ icon, title, desc }: { icon: string; title: string; desc: string }) {
+  return (
+    <div className="rounded-lg border border-line bg-surface p-3">
+      <div className="text-xl">{icon}</div>
+      <div className="mt-1 font-semibold text-ink">{title}</div>
+      <div className="text-xs text-muted">{desc}</div>
+    </div>
+  );
+}
+
 function CampaignCard({ campaign, onEdit }: { campaign: Campaign; onEdit: () => void }) {
   const navigate = useNavigate();
   const setActive = useUiStore((s) => s.setActiveCampaign);

src/features/world/map/MapEditor.tsx

@@ -53,7 +53,8 @@ export function MapEditor({ map, campaign }: { map: BattleMap; campaign: Campaig
   const [gmDraw, setGmDraw] = useState(true);
   const [dims, setDims] = useState({ cols: 0, rows: 0 });
   const [editToken, setEditToken] = useState<string | null>(null);
-  const [showPalette, setShowPalette] = useState(true);
+  // Collapsed by default on small screens so the map gets the width.
+  const [showPalette, setShowPalette] = useState(() => typeof window === 'undefined' || window.innerWidth >= 880);
 
   // transient interaction state
   const [overlay, setOverlay] = useState<Overlay>({});