Ship K-design admin with multi-channel support and polish.

Replace placeholder admin pages with the design system, add analytics/customers/categories/inventory/settings, channel pricing and order sources, plus skeleton loaders and clean motion.

Co-authored-by: Cursor <cursoragent@cursor.com>

design/admin/assets/_shell-nav.html

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+<!-- Shared nav snippet reference (SVG icons). Active link: add class is-active -->
+<aside class="sidebar" id="sidebar">
+  <div class="sidebar-brand">
+    <span class="mark"><svg class="ico" aria-hidden="true"><use href="#i-bulb"></use></svg></span>
+    <span>iLED Admin</span>
+  </div>
+  <nav class="sidebar-nav" aria-label="Main">
+    <div class="nav-group">
+      <div class="nav-group-label">Ops</div>
+      <a class="nav-link" href="02-dashboard.html"><svg class="ico" aria-hidden="true"><use href="#i-dashboard"></use></svg> Dashboard</a>
+      <a class="nav-link" href="14-analytics.html"><svg class="ico" aria-hidden="true"><use href="#i-dashboard"></use></svg> Analytics</a>
+      <a class="nav-link" href="05-orders.html"><svg class="ico" aria-hidden="true"><use href="#i-orders"></use></svg> Orders</a>
+      <a class="nav-link" href="12-inventory.html"><svg class="ico" aria-hidden="true"><use href="#i-inventory"></use></svg> Inventory</a>
+    </div>
+    <div class="nav-group">
+      <div class="nav-group-label">Catalog</div>
+      <a class="nav-link" href="03-products.html"><svg class="ico" aria-hidden="true"><use href="#i-products"></use></svg> Products</a>
+      <a class="nav-link" href="11-categories.html"><svg class="ico" aria-hidden="true"><use href="#i-categories"></use></svg> Categories</a>
+    </div>
+    <div class="nav-group">
+      <div class="nav-group-label">People</div>
+      <a class="nav-link" href="10-customers.html"><svg class="ico" aria-hidden="true"><use href="#i-customers"></use></svg> Customers</a>
+    </div>
+    <div class="nav-group">
+      <div class="nav-group-label">Marketing</div>
+      <a class="nav-link" href="07-promotions.html"><svg class="ico" aria-hidden="true"><use href="#i-promotions"></use></svg> Promotions</a>
+      <a class="nav-link" href="08-newsletter.html"><svg class="ico" aria-hidden="true"><use href="#i-newsletter"></use></svg> Newsletter</a>
+      <a class="nav-link" href="09-reviews.html"><svg class="ico" aria-hidden="true"><use href="#i-reviews"></use></svg> Reviews</a>
+    </div>
+    <div class="nav-group">
+      <div class="nav-group-label">System</div>
+      <a class="nav-link" href="13-settings.html"><svg class="ico" aria-hidden="true"><use href="#i-settings"></use></svg> Settings</a>
+    </div>
+  </nav>
+  <div class="sidebar-foot">
+    <a class="btn btn-secondary w-full" href="01-login.html">Log out</a>
+  </div>
+</aside>