v0.1.19 - Throughput overview & responsive header

- Throughput: new "Throughput Overview" header with Gauge icon and brand-green
  badge icons on each card (Today, This week, 4-week average, Horse Mix, Grain Mix)
- Throughput: inline rolling-range selector (7d / 4w / 6w / 12w, default 4 weeks)
  driving the customer-mix cards; stats window widened to 12 weeks so switching
  range is a pure client-side re-filter
- Throughput: cards collapse to a single even 5-across row on laptop and up,
  with container-query value text that scales to each card's width
- Throughput: date logic pinned to Australian Eastern time (fixes the day-early
  date); This week subtitle shows the Mon-Sun date range
- Throughput: subtler tinted add-form; removed the inline-entry kicker and the
  "Open full form" link
- Topbar: fix cramped laptop header - action toggles no longer wrap above the
  user button; search drops to its own row earlier

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/routes/ordering/manage/customers/+page.ts

@@ -0,0 +1,17 @@
+import { hasStoredClientSession } from '$lib/session';
+import { api } from '$lib/api';
+import type { OrderingCustomer } from '$lib/types';
+
+// Customer accounts. Access enforced by the family +layout.ts guard.
+export async function load({ fetch }) {
+  if (!hasStoredClientSession()) {
+    return { customers: [] as OrderingCustomer[] };
+  }
+
+  try {
+    const customers = await api.orderingAdmin.customers(fetch);
+    return { customers };
+  } catch {
+    return { customers: [] as OrderingCustomer[] };
+  }
+}