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/lib/changelog.ts

@@ -8,7 +8,7 @@ import packageInfo from '../../package.json';
  */
 export type ChangelogEntry = {
   version: string;
-  /** ISO date (YYYY-MM-DD) the version shipped. */
+  /** ISO date (YYYY-MM-DD) the version shipped. */a
   date: string;
   highlights: string[];
 };
@@ -17,14 +17,28 @@ export type ChangelogEntry = {
 export const APP_VERSION: string = packageInfo.version;
 
 export const changelog: ChangelogEntry[] = [
+  {
+    version: '0.1.18',
+    date: '2026-06-12',
+    highlights: [
+      'App - Improvements',
+      'App - Bug fixes'
+    ]
+  },
+  {
+    version: '0.1.17',
+    date: '2026-06-12',
+    highlights: [
+      'App - Improvements',
+      'App - Mix Calculator bug fixes'
+    ]
+  },
   {
     version: '0.1.14',
     date: '2026-06-11',
     highlights: [
-      'New: private B2B customer ordering portal — customers browse their catalogue, see account-specific pricing, and submit orders.',
-      'Order management console for internal staff: review orders, manage products, pricing, and the full order lifecycle.',
-      'Customer-specific pricing engine (fixed, contract, price lists, tiered, and quote-only) calculated on the backend.',
-      'Order confirmations (PDF) and Xero submission, behind a clean integration layer.'
+      'Web App: Improved mix calculator',
+      'Web App: Improved design'
     ]
   },
   {