feat: chat agent knows current page context (order/product)

Frontend: Layout extracts order/product UUID from URL path and passes
to ChatPanel as contextType/contextId. When on /orders/{uuid}, the
chat knows which order you're viewing.

Backend: System prompt now loads actual entity data for the context:
- Order: order_number, status, line counts (completed/processing/failed)
- Product: name, PIM-ID, category, STEP file status

The AI understands "this order", "current product" etc. Example:
"What's the status of this order?" → agent knows you mean SA-2026-00164

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend/app/services/chat_service.py

@@ -682,8 +682,60 @@ async def chat_with_agent(
 
     # Build context-aware system prompt
     system_content = SYSTEM_PROMPT
-    if context_type and context_id:
-        system_content += f"\n\nCurrent context: {context_type} {context_id}"
+
+    # Load entity details for the current page context
+    if context_type == "order" and context_id:
+        try:
+            ctx_result = await db.execute(
+                text("""
+                    SELECT o.order_number, o.status, o.notes, o.created_at,
+                           COUNT(ol.id) AS line_count,
+                           COUNT(ol.id) FILTER (WHERE ol.render_status = 'completed') AS completed,
+                           COUNT(ol.id) FILTER (WHERE ol.render_status = 'processing') AS processing,
+                           COUNT(ol.id) FILTER (WHERE ol.render_status = 'failed') AS failed,
+                           COUNT(ol.id) FILTER (WHERE ol.render_status = 'pending') AS pending
+                    FROM orders o
+                    LEFT JOIN order_lines ol ON ol.order_id = o.id
+                    WHERE o.id = :ctx_id AND o.tenant_id = :tid
+                    GROUP BY o.id
+                """),
+                {"ctx_id": context_id, "tid": tenant_id},
+            )
+            row = ctx_result.mappings().first()
+            if row:
+                system_content += (
+                    f"\n\nThe user is currently viewing order {row['order_number']} "
+                    f"(ID: {context_id}, status: {row['status']}, "
+                    f"{row['line_count']} lines: {row['completed']} completed, "
+                    f"{row['processing']} processing, {row['failed']} failed, "
+                    f"{row['pending']} pending). "
+                    f"When the user says 'this order' or 'current order', they mean {row['order_number']} ({context_id})."
+                )
+        except Exception:
+            system_content += f"\n\nThe user is viewing order {context_id}."
+    elif context_type == "product" and context_id:
+        try:
+            ctx_result = await db.execute(
+                text("""
+                    SELECT p.name, p.pim_id, p.category_key, p.baureihe,
+                           CASE WHEN p.cad_file_id IS NOT NULL THEN true ELSE false END AS has_step
+                    FROM products p
+                    WHERE p.id = :ctx_id AND p.tenant_id = :tid
+                """),
+                {"ctx_id": context_id, "tid": tenant_id},
+            )
+            row = ctx_result.mappings().first()
+            if row:
+                system_content += (
+                    f"\n\nThe user is currently viewing product '{row['name']}' "
+                    f"(ID: {context_id}, PIM-ID: {row['pim_id']}, "
+                    f"category: {row['category_key']}, "
+                    f"has STEP: {row['has_step']}). "
+                    f"When the user says 'this product' or 'current product', they mean '{row['name']}' ({context_id})."
+                )
+        except Exception:
+            system_content += f"\n\nThe user is viewing product {context_id}."
+
     system_content += f"\n\nThe user's tenant_id is '{tenant_id}'. Always filter queries by this tenant_id."
 
     messages: list[dict] = [{"role": "system", "content": system_content}]

frontend/src/components/layout/Layout.tsx

@@ -1,4 +1,4 @@
-import { Outlet, NavLink, useNavigate, Link } from 'react-router-dom'
+import { Outlet, NavLink, useNavigate, Link, useLocation } from 'react-router-dom'
 import { LayoutDashboard, Package, Settings, LogOut, FlaskConical, Activity, Library, Plus, SlidersHorizontal, Building2, GitBranch, Image, BellRing, Receipt, Server, Upload, Menu, X, MessageSquare } from 'lucide-react'
 import { useAuthStore, isAdmin as checkIsAdmin, isPrivileged as checkIsPrivileged } from '../../store/auth'
 import { clsx } from 'clsx'
@@ -36,9 +36,20 @@ const adminOnlyNav = [
 export default function Layout() {
   const { user, logout } = useAuthStore()
   const navigate = useNavigate()
+  const location = useLocation()
   const [sidebarOpen, setSidebarOpen] = useState(false)
   const [chatOpen, setChatOpen] = useState(false)
 
+  // Extract page context from URL for the chat agent
+  const chatContext = (() => {
+    const path = location.pathname
+    const orderMatch = path.match(/^\/orders\/([0-9a-f-]{36})/)
+    if (orderMatch) return { type: 'order', id: orderMatch[1] }
+    const productMatch = path.match(/^\/products\/([0-9a-f-]{36})/)
+    if (productMatch) return { type: 'product', id: productMatch[1] }
+    return { type: undefined, id: undefined }
+  })()
+
   const { data: activity } = useQuery({
     queryKey: ['worker-activity'],
     queryFn: getWorkerActivity,
@@ -260,7 +271,7 @@ export default function Layout() {
       )}
 
       {/* Chat panel */}
-      {chatOpen && <ChatPanel open={chatOpen} onClose={() => setChatOpen(false)} />}
+      {chatOpen && <ChatPanel open={chatOpen} onClose={() => setChatOpen(false)} contextType={chatContext.type} contextId={chatContext.id} />}
     </div>
   )
 }