Activate UIUX V2 navigation for manager and partner pilots

app/ui/templates/components/partner_navigation_v2.html

@@ -0,0 +1,59 @@
+{#
+  UI/UX V2 Phase 1D — Partner pilot navigation
+
+  Presentation-only replacement for the existing partner tab strip.
+  Existing URLs, route protection, dashboard content, forms and page actions
+  are unchanged.
+#}
+{% set _partner_path = request.url.path %}
+{% set navigation_aria_label_v2 = 'Partner workspace navigation' %}
+{% set navigation_items_v2 = [
+  {
+    'label': 'Dashboard',
+    'url': '/partner/dashboard',
+    'visible': true,
+    'active': _partner_path == '/partner/dashboard'
+  },
+  {
+    'label': 'Review Board',
+    'url': '/partner/reviews',
+    'visible': true,
+    'active': _partner_path.startswith('/partner/reviews')
+  },
+  {
+    'label': 'My Clients',
+    'url': '/partner/clients',
+    'visible': true,
+    'active': _partner_path.startswith('/partner/clients')
+  },
+  {
+    'label': 'Engagements',
+    'url': '/services/engagements',
+    'visible': true,
+    'active': _partner_path.startswith('/services/engagements')
+  },
+  {
+    'label': 'Documents',
+    'url': '/documents',
+    'visible': true,
+    'active': _partner_path.startswith('/documents')
+  },
+  {
+    'label': 'Billing',
+    'url': '/billing',
+    'visible': true,
+    'active': _partner_path.startswith('/billing')
+  },
+  {
+    'label': 'Alerts',
+    'url': '/alerts',
+    'visible': true,
+    'active': _partner_path.startswith('/alerts'),
+    'badge': unread_alert_count if unread_alert_count is defined and unread_alert_count > 0 else none
+  }
+] %}
+
+<div class="mb-6 overflow-hidden rounded-2xl border border-slate-200 bg-white shadow-soft" data-uiux-v2-pilot="partner">
+  {% include "ui/templates/components/navigation_v2.html" %}
+  {% include "ui/templates/components/mobile_navigation_v2.html" %}
+</div>