Add multi-line sale builder with pending-draft safeguard

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/routes/invoices/[id]/+page.server.js

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+import { error } from '@sveltejs/kit';
+import { getInvoice } from '$lib/server/invoices.js';
+
+export function load({ params }) {
+  const result = getInvoice(params.id);
+  if (!result || result.invoice.status !== 'saved') {
+    throw error(404, 'Invoice not found');
+  }
+  return result;
+}

src/routes/invoices/[id]/+page.svelte

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+<script>
+  import { locale, t, localized, formatMoney } from '$lib/i18n/store.js';
+
+  export let data;
+  $: lang = $locale;
+  $: ({ invoice, lines } = data);
+
+  function lineLabel(line) {
+    if (line.affects_inventory === 0) return line.label;
+    return `${line.part_sku} — ${localized({ name_en: line.part_name_en, name_tg: line.part_name_tg }, 'name', lang)}`;
+  }
+</script>
+
+<article class="receipt">
+  <header class="head">
+    <div>
+      <h1>{$t('invoices.saved_title')} #{invoice.id}</h1>
+      <p class="muted">{invoice.saved_at}</p>
+    </div>
+    <a href="/invoices/new" class="print-hide back">← {$t('invoices.new_another')}</a>
+  </header>
+
+  <table>
+    <thead>
+      <tr>
+        <th>{$t('invoices.item')}</th>
+        <th class="num">{$t('movements.quantity')}</th>
+        <th class="num">{$t('movements.unit_price')}</th>
+        <th class="num">{$t('invoices.line_total')}</th>
+      </tr>
+    </thead>
+    <tbody>
+      {#each lines as line}
+        {@const lineTotal = line.quantity * line.unit_price_dirams}
+        <tr>
+          <td>{lineLabel(line)}</td>
+          <td class="num">{line.quantity}</td>
+          <td class="num">{formatMoney(line.unit_price_dirams, lang)}</td>
+          <td class="num">{formatMoney(lineTotal, lang)}</td>
+        </tr>
+      {/each}
+    </tbody>
+    <tfoot>
+      <tr>
+        <td colspan="3" class="num"><strong>{$t('invoices.saved_total')}</strong></td>
+        <td class="num">
+          <strong>{formatMoney(invoice.total_dirams, lang)} {$t('common.currency_short')}</strong>
+        </td>
+      </tr>
+    </tfoot>
+  </table>
+
+  <section class="pay">
+    <p class="muted">{$t('invoices.saved_thanks')}</p>
+    <img src="/payment-qr.jpg" alt="Payment QR code" class="qr" />
+  </section>
+</article>
+
+<style>
+  .receipt { max-width: 720px; margin: 0 auto; }
+  .head {
+    display: flex;
+    align-items: flex-start;
+    justify-content: space-between;
+    gap: 1rem;
+    margin-bottom: 1rem;
+  }
+  .head h1 { margin: 0; }
+  .head .muted { margin: 0.25rem 0 0; font-size: 0.9rem; }
+  .back {
+    text-decoration: none;
+    padding: 0.4rem 0.8rem;
+    border: 1px solid #c8cfdc;
+    border-radius: 4px;
+    background: #fff;
+    font-size: 0.9rem;
+  }
+  tfoot td { background: #f5f7fb; }
+  .pay {
+    margin-top: 1.5rem;
+    text-align: center;
+  }
+  .qr {
+    display: block;
+    margin: 0.75rem auto 0;
+    max-width: 280px;
+    width: 100%;
+    height: auto;
+    border: 1px solid #e5e8ee;
+    background: #fff;
+    padding: 6px;
+  }
+
+  @media print {
+    :global(.header), :global(.lang) { display: none !important; }
+    .print-hide { display: none !important; }
+    :global(body) { background: #fff; }
+    :global(.container) { padding: 0; max-width: 100%; }
+  }
+</style>