feat(#52): dynamic scenario client (form → review → finalize) + e2e

Additive 'Create scenario' path (v0.31): the home screen's create-scenario
card opens a ScenarioForm (pick one of 3 light era templates + a free-text
description + an editable, era-prefilled start year) whose 'Generate world'
posts the draft request; the CheckpointReview screen shows the generated
world (per-nation stats/territory/relations + backstory) and the advisor's
checkpoint list as an approve/remove checklist, then the player picks a
nation to lead and finalizes into a saved, playable game. Both LLM steps ride
the scenario client (deterministic stub under LLM_STUB=1); a failure toasts
and stays on the current screen. The turn stub and static presets are
untouched. New e2e covers the full deterministic flow (near-future 2035,
remove checkpoint 3, lead Boreas, finalize, one empty jump) and the 3-template
manifest.

src/components/CheckpointReview.tsx

@@ -0,0 +1,278 @@
+import { useState } from 'react';
+import { Check, ListChecks, Loader2, Sparkles } from 'lucide-react';
+import { Badge } from './ui/badge';
+import { Button } from './ui/button';
+import { Card, CardContent, CardDescription, CardHeader, CardTitle } from './ui/card';
+import StatBar from './StatBar';
+import { cn } from '@/lib/utils';
+import { EVENT_COLORS, RELATION_COLORS } from '@/lib/colors';
+import { relationFromScore, type TemplateMeta, type WorldDraft, type WorldNation } from '@shared/scenario';
+
+interface Props {
+  /** The era template the draft was generated from (name/year for the header). */
+  template: TemplateMeta;
+  /** The free-text description the user wrote (shown as the world's context). */
+  description: string;
+  /** The effective start year (template default or the user's override). */
+  year: number;
+  /** The step-1 draft world to review and finalize. */
+  world: WorldDraft;
+  /** The advisor's proposed checkpoints (all approved by default). */
+  checkpoints: string[];
+  /** A finalize (LLM) call is in flight — disables the controls. */
+  busy?: boolean;
+  /** Back to the scenario form (a fresh attempt — the form's state resets). */
+  onBack: () => void;
+  /** Step 2: finalize with the approved checkpoints + the chosen nation to lead. */
+  onFinalize: (approvedCheckpoints: string[], playerNationId: string) => void;
+}
+
+const STAT_BARS: Array<{ key: keyof WorldNation['stats']; label: string }> = [
+  { key: 'military', label: 'Military' },
+  { key: 'economy', label: 'Economy' },
+  { key: 'stability', label: 'Stability' },
+  { key: 'population', label: 'Population' },
+];
+
+/**
+ * "Create scenario" — step 2 of the dynamic path (v0.31, #52). Shows the
+ * generated world (each nation's stats, territory country codes, and
+ * relations; plus any backstory events) and the advisor's proposed
+ * checkpoints as an approve/remove checklist (approved by default — the
+ * approved ones bind the finalize step). The player then picks which nation
+ * to lead (the nation cards mirror NationSelect's pick screen; the draft's
+ * nations are not a static Preset, so they are rendered here directly) and
+ * finalizes. On success the app navigates into the new game; on failure it
+ * toasts and stays here with the current selections intact.
+ */
+export default function CheckpointReview({
+  template,
+  description,
+  year,
+  world,
+  checkpoints,
+  busy = false,
+  onBack,
+  onFinalize,
+}: Props) {
+  // Approve/remove per checkpoint (approved by default — the advisor's list is
+  // a starting point the player prunes, not a form they fill in).
+  const [approved, setApproved] = useState<boolean[]>(() => checkpoints.map(() => true));
+  // The nation the player will lead (none until explicitly picked).
+  const [selectedId, setSelectedId] = useState<string | null>(null);
+
+  const nameOf = (id: string) => world.nations.find((n) => n.id === id)?.name ?? id;
+  const approvedCount = approved.filter(Boolean).length;
+  const selected = selectedId ? world.nations.find((n) => n.id === selectedId) : undefined;
+
+  const toggle = (i: number) =>
+    setApproved((prev) => prev.map((v, j) => (j === i ? !v : v)));
+
+  const finalize = () => {
+    if (!selectedId) return;
+    onFinalize(
+      checkpoints.filter((_, i) => approved[i]),
+      selectedId,
+    );
+  };
+
+  return (
+    <div className="mx-auto max-w-4xl px-6 py-8" data-testid="scenario-review">
+      <Button variant="ghost" size="sm" onClick={onBack} className="mb-4">
+        ← Back to form
+      </Button>
+      <div className="flex items-center gap-3">
+        <h1 className="text-3xl font-bold tracking-tight">{template.name}</h1>
+        <Badge variant="secondary" className="text-sm">
+          {year}
+        </Badge>
+      </div>
+      {description && (
+        <p className="mt-2 max-w-3xl whitespace-pre-line text-sm leading-relaxed text-muted-foreground">
+          {description}
+        </p>
+      )}
+
+      {/* --- The generated world --- */}
+      <h2 className="mb-3 mt-8 text-lg font-semibold">The generated world</h2>
+      <div className="space-y-3">
+        {world.nations.map((n) => (
+          <div
+            key={n.id}
+            className="rounded-lg border border-border/60 bg-card/40 p-3"
+            data-testid="draft-nation"
+            data-nation-id={n.id}
+          >
+            <div className="flex flex-wrap items-center gap-2">
+              <span className="font-medium">{n.name}</span>
+              <Badge variant="secondary" className="text-xs capitalize">
+                {n.type ?? 'major'}
+              </Badge>
+              {n.territory.length > 0 && (
+                <span className="ml-auto text-xs text-muted-foreground">
+                  {n.territory.join(' · ')}
+                </span>
+              )}
+            </div>
+            <div className="mt-2 grid gap-x-6 gap-y-1 sm:grid-cols-2">
+              {STAT_BARS.map(({ key, label }) => (
+                <StatBar key={key} label={label} value={n.stats[key]} />
+              ))}
+            </div>
+            {Object.keys(n.relations).length > 0 && (
+              <div className="mt-2 flex flex-wrap gap-1.5">
+                {Object.entries(n.relations).map(([otherId, score]) => {
+                  const status = relationFromScore(score);
+                  return (
+                    <span
+                      key={otherId}
+                      className="rounded-full border px-2 py-0.5 text-[11px] font-medium"
+                      style={{
+                        color: RELATION_COLORS[status],
+                        borderColor: `${RELATION_COLORS[status]}55`,
+                      }}
+                    >
+                      {nameOf(otherId)} {score > 0 ? `+${score}` : score}
+                    </span>
+                  );
+                })}
+              </div>
+            )}
+          </div>
+        ))}
+
+        {(world.events ?? []).length > 0 && (
+          <div className="rounded-lg border border-border/60 bg-card/40 p-3">
+            <div className="mb-2 text-[11px] font-medium uppercase tracking-wide text-muted-foreground">
+              Backstory
+            </div>
+            <ul className="space-y-2">
+              {(world.events ?? []).map((e, i) => (
+                <li key={i} className="flex items-start gap-2 text-sm" data-testid="draft-event">
+                  <span
+                    className="mt-1.5 inline-block size-2 shrink-0 rounded-full"
+                    style={{ background: EVENT_COLORS[e.type] }}
+                    aria-hidden
+                  />
+                  <span className="min-w-0 flex-1">
+                    <span className="font-medium">{nameOf(e.nation)}:</span>{' '}
+                    {e.title} — {e.text}
+                  </span>
+                </li>
+              ))}
+            </ul>
+          </div>
+        )}
+      </div>
+
+      {/* --- Advisor checkpoints (approve / remove) --- */}
+      <div className="mt-8 flex items-center gap-2">
+        <ListChecks className="size-4 text-primary" />
+        <h2 className="text-lg font-semibold">Advisor checkpoints</h2>
+        <Badge variant="secondary" className="ml-auto text-xs tabular-nums">
+          {approvedCount} of {checkpoints.length} approved
+        </Badge>
+      </div>
+      <p className="mb-3 mt-1 text-sm leading-relaxed text-muted-foreground">
+        The advisor’s opening read of this world’s live strategic threads. Keep the ones the final
+        world should respect — removed checkpoints are dropped.
+      </p>
+      <ul className="space-y-1.5">
+        {checkpoints.map((c, i) => (
+          <li
+            key={`${i}-${c}`}
+            className={cn(
+              'flex items-center gap-2 rounded-lg border p-2.5 text-sm',
+              approved[i]
+                ? 'border-amber-500/30 bg-amber-500/10'
+                : 'border-border/60 bg-card/30 text-muted-foreground',
+            )}
+            data-testid="checkpoint-item"
+            data-approved={approved[i] ? 'true' : 'false'}
+          >
+            <span
+              className={cn(
+                'inline-flex size-4 shrink-0 items-center justify-center rounded-full border',
+                approved[i] ? 'border-amber-500/50 bg-amber-500/20' : 'border-border',
+              )}
+              aria-hidden
+            >
+              {approved[i] && <Check className="size-3 text-amber-400" />}
+            </span>
+            <span className="min-w-0 flex-1 leading-snug">{c}</span>
+            <Button
+              variant={approved[i] ? 'ghost' : 'secondary'}
+              size="sm"
+              onClick={() => toggle(i)}
+              disabled={busy}
+              data-testid="checkpoint-toggle"
+            >
+              {approved[i] ? 'Remove' : 'Keep'}
+            </Button>
+          </li>
+        ))}
+      </ul>
+
+      {/* --- Choose your nation (cards mirror NationSelect's pick screen) --- */}
+      <h2 className="mb-3 mt-8 text-lg font-semibold">Choose your nation</h2>
+      <div className="grid gap-4 sm:grid-cols-2 lg:grid-cols-3">
+        {world.nations.map((n) => {
+          const isSel = n.id === selectedId;
+          return (
+            <Card
+              key={n.id}
+              className={cn(
+                'flex flex-col transition',
+                isSel ? 'ring-2 ring-primary/60' : 'hover:ring-1 hover:ring-primary/40',
+              )}
+              data-testid="scenario-nation-card"
+              data-nation-id={n.id}
+              data-selected={isSel ? 'true' : 'false'}
+            >
+              <CardHeader>
+                <CardTitle className="flex items-center gap-2 text-base">
+                  {n.name}
+                  {isSel && <Check className="size-4 shrink-0 text-primary" />}
+                </CardTitle>
+                <CardDescription>
+                  {n.type ?? 'major'} · {n.territory.length} territory unit
+                  {n.territory.length === 1 ? '' : 's'} ({n.territory.join(', ')})
+                </CardDescription>
+              </CardHeader>
+              <CardContent className="mt-auto space-y-1.5">
+                {STAT_BARS.map(({ key, label }) => (
+                  <StatBar key={key} label={label} value={n.stats[key]} />
+                ))}
+                <Button
+                  className="mt-3 w-full"
+                  variant={isSel ? 'default' : 'secondary'}
+                  onClick={() => setSelectedId(n.id)}
+                  disabled={busy}
+                  data-testid="scenario-lead-nation"
+                >
+                  {isSel ? 'Leading' : `Play as ${n.name}`}
+                </Button>
+              </CardContent>
+            </Card>
+          );
+        })}
+      </div>
+
+      {/* --- Finalize --- */}
+      <div
+        className="mt-8 flex flex-wrap items-center justify-between gap-3 rounded-xl border border-primary/30 bg-primary/5 p-3"
+        data-testid="finalize-bar"
+      >
+        <span className="min-w-0 flex-1 text-sm text-muted-foreground">
+          {selected
+            ? `Finalizing as ${selected.name} with ${approvedCount} of ${checkpoints.length} checkpoints approved.`
+            : 'Pick the nation you will lead, then finalize the scenario.'}
+        </span>
+        <Button className="shrink-0" onClick={finalize} disabled={busy || !selected} data-testid="finalize-scenario">
+          {busy ? <Loader2 className="size-4 animate-spin" /> : <Sparkles className="size-4" />}
+          {busy ? 'Finalizing…' : 'Finalize scenario'}
+        </Button>
+      </div>
+    </div>
+  );
+}