feat: <npc-tray> seed-to-character generator UI

src/components/npc-tray.js

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+import { generateNpc } from '../npc/generator.js';
+import { getGenrePack, listGenrePacks } from '../npc/packs/index.js';
+
+export class NpcTray extends HTMLElement {
+  constructor() {
+    super();
+    this.rng = Math.random;
+    this.genreId = 'noir';
+    this.last = null;
+    this._seedValue = '';
+  }
+  connectedCallback() { this.render(); }
+
+  generate() {
+    const input = this.querySelector('[data-role=seed]');
+    this._seedValue = input ? input.value : '';
+    const pack = getGenrePack(this.genreId);
+    this.last = generateNpc(pack, this._seedValue, this.rng);
+    this.render();
+  }
+
+  render() {
+    const pills = listGenrePacks().map((p) =>
+      `<button class="pill ${p.id === this.genreId ? 'on' : ''}" data-genre="${p.id}">${p.label}</button>`).join('');
+    const n = this.last;
+    const card = n ? `
+      <div class="npc-card" data-role="card">
+        <div class="npc-name" data-role="npc-name">${n.name}</div>
+        <div class="npc-seed">${n.seed}</div>
+        <dl>
+          <dt>Look</dt><dd>${n.look}</dd>
+          <dt>Manner</dt><dd>${n.manner}</dd>
+          <dt>Wants</dt><dd>${n.wants}</dd>
+          <dt>Secret</dt><dd class="secret">${n.secret}</dd>
+          <dt>Voice</dt><dd>${n.voice}</dd>
+        </dl>
+        <div class="npc-actions">
+          <button class="npc-btn" data-role="reroll">↻ Reroll</button>
+          <button class="npc-btn keep" data-role="keep">＋ Keep in cast</button>
+        </div>
+      </div>` : '';
+
+    this.innerHTML = `
+      <div class="npc-tray">
+        <div class="pills">${pills}</div>
+        <input class="seed" data-role="seed" placeholder="a little info — e.g. nervous dock foreman" value="${this._seedValue}" />
+        <button class="generate" data-role="generate">✦ Generate NPC</button>
+        ${card}
+      </div>`;
+
+    this.querySelectorAll('[data-genre]').forEach((b) =>
+      b.addEventListener('click', () => { this.genreId = b.dataset.genre; this.render(); }));
+    this.querySelector('[data-role=generate]').addEventListener('click', () => this.generate());
+    this.querySelector('[data-role=reroll]')?.addEventListener('click', () => this.generate());
+    this.querySelector('[data-role=keep]')?.addEventListener('click', () => {
+      if (this.last) this.dispatchEvent(new CustomEvent('keep-npc', { detail: this.last, bubbles: true }));
+    });
+  }
+}
+customElements.define('npc-tray', NpcTray);

tests/components/npc-tray.test.js

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+// tests/components/npc-tray.test.js
+import { describe, it, expect, beforeEach } from 'vitest';
+import '../../src/components/npc-tray.js';
+
+function seq(values) { let i = 0; return () => values[i++ % values.length]; }
+
+describe('<npc-tray>', () => {
+  let el;
+  beforeEach(() => {
+    document.body.innerHTML = '';
+    el = document.createElement('npc-tray');
+    document.body.appendChild(el);
+  });
+
+  it('renders a seed input and a generate button', () => {
+    expect(el.querySelector('[data-role=seed]')).not.toBe(null);
+    expect(el.querySelector('[data-role=generate]')).not.toBe(null);
+  });
+
+  it('generates an NPC card from the seed using the noir pack', () => {
+    el.rng = seq([0.0]); // every pick -> index 0
+    el.querySelector('[data-role=seed]').value = 'dock foreman';
+    el.querySelector('[data-role=generate]').click();
+    expect(el.last.seed).toBe('dock foreman');
+    expect(el.last.genre).toMatch(/noir/i);
+    expect(el.querySelector('[data-role=card]')).not.toBe(null);
+    expect(el.querySelector('[data-role=npc-name]').textContent.length).toBeGreaterThan(0);
+  });
+
+  it('emits keep-npc with the generated npc when Keep is clicked', () => {
+    el.rng = seq([0.0]);
+    el.querySelector('[data-role=seed]').value = 'x';
+    el.querySelector('[data-role=generate]').click();
+    let detail = null;
+    el.addEventListener('keep-npc', (e) => { detail = e.detail; });
+    el.querySelector('[data-role=keep]').click();
+    expect(detail).not.toBe(null);
+    expect(detail.name).toBe(el.last.name);
+  });
+});