feat: add batch detail endpoint and fix drill-down navigation

Backend:
- Add getBatchById controller with touch points and IPM schedule
- Add GET /batches/:id route

Frontend:
- Update Batch interface to include touchPoints
- BatchDetailPage now uses real touch points from API
- Better error handling on batch load failure

backend/src/controllers/batches.controller.ts

@@ -17,6 +17,33 @@ export const getBatches = async (request: FastifyRequest, reply: FastifyReply) =
     return batches;
 };
 
+export const getBatchById = async (request: FastifyRequest, reply: FastifyReply) => {
+    const { id } = request.params as { id: string };
+
+    const batch = await request.server.prisma.batch.findUnique({
+        where: { id },
+        include: {
+            room: true,
+            ipmSchedule: true,
+            touchPoints: {
+                orderBy: { createdAt: 'desc' },
+                take: 10,
+                include: {
+                    user: {
+                        select: { id: true, name: true }
+                    }
+                }
+            }
+        }
+    });
+
+    if (!batch) {
+        return reply.status(404).send({ message: 'Batch not found' });
+    }
+
+    return batch;
+};
+
 
 export const createBatch = async (request: FastifyRequest, reply: FastifyReply) => {
     const {

backend/src/routes/batches.routes.ts

@@ -1,5 +1,5 @@
 import { FastifyInstance } from 'fastify';
-import { getBatches, createBatch, updateBatch } from '../controllers/batches.controller';
+import { getBatches, getBatchById, createBatch, updateBatch } from '../controllers/batches.controller';
 
 export async function batchRoutes(server: FastifyInstance) {
     server.addHook('onRequest', async (request) => {
@@ -11,6 +11,7 @@ export async function batchRoutes(server: FastifyInstance) {
     });
 
     server.get('/', getBatches);
+    server.get('/:id', getBatchById);
     server.post('/', createBatch);
     server.put('/:id', updateBatch);
 }

frontend/src/lib/batchesApi.ts

@@ -21,6 +21,16 @@ export interface Batch {
         intervalDays: number;
         product?: string;
     };
+    touchPoints?: {
+        id: string;
+        type: string;
+        notes?: string;
+        createdAt: string;
+        user?: {
+            id: string;
+            name: string;
+        };
+    }[];
 }
 
 export const batchesApi = {

frontend/src/pages/BatchDetailPage.tsx

@@ -181,7 +181,7 @@ export default function BatchDetailPage() {
     const [batch, setBatch] = useState<Batch | null>(null);
     const [loading, setLoading] = useState(true);
 
-    // Mock sensor data
+    // Mock sensor data (will be replaced with real sensor API)
     const [sensorData] = useState(() => ({
         temperature: generateMockData(14, 72, 78),
         humidity: generateMockData(14, 50, 65),
@@ -190,20 +190,14 @@ export default function BatchDetailPage() {
         lightPPFD: generateMockData(14, 600, 900),
     }));
 
-    // Mock touch points
-    const [touchPoints] = useState(() => [
-        { type: 'INSPECT', date: new Date().toISOString(), user: 'Alex', notes: 'Looking healthy' },
-        { type: 'WATER', date: new Date(Date.now() - 86400000).toISOString(), user: 'Jordan' },
-        { type: 'FEED', date: new Date(Date.now() - 172800000).toISOString(), user: 'Alex', notes: 'Week 3 flower nutrients' },
-        { type: 'PHOTO', date: new Date(Date.now() - 259200000).toISOString(), user: 'Sam', notes: 'Progress photo' },
-        { type: 'INSPECT', date: new Date(Date.now() - 345600000).toISOString(), user: 'Jordan', notes: 'No issues' },
-    ]);
-
     useEffect(() => {
         if (id) {
             batchesApi.getById(id)
                 .then(setBatch)
-                .catch(() => navigate('/batches'))
+                .catch((err) => {
+                    console.error('Failed to load batch:', err);
+                    navigate('/batches');
+                })
                 .finally(() => setLoading(false));
         }
     }, [id, navigate]);
@@ -324,12 +318,22 @@ export default function BatchDetailPage() {
                 <div className="card">
                     <div className="p-4 border-b border-subtle flex items-center justify-between">
                         <h3 className="text-sm font-medium text-primary">Recent Activity</h3>
-                        <span className="text-xs text-tertiary">{touchPoints.length} entries</span>
+                        <span className="text-xs text-tertiary">{batch.touchPoints?.length || 0} entries</span>
                     </div>
                     <div className="p-4 divide-y divide-subtle">
-                        {touchPoints.map((tp, i) => (
-                            <TouchPoint key={i} {...tp} />
-                        ))}
+                        {batch.touchPoints && batch.touchPoints.length > 0 ? (
+                            batch.touchPoints.map((tp) => (
+                                <TouchPoint
+                                    key={tp.id}
+                                    type={tp.type}
+                                    date={tp.createdAt}
+                                    user={tp.user?.name || 'Unknown'}
+                                    notes={tp.notes}
+                                />
+                            ))
+                        ) : (
+                            <p className="text-sm text-tertiary text-center py-4">No activity yet</p>
+                        )}
                     </div>
                 </div>
 
@@ -344,7 +348,7 @@ export default function BatchDetailPage() {
                                 <div className="text-xs text-tertiary">Days</div>
                             </div>
                             <div>
-                                <div className="text-2xl font-semibold text-primary">{touchPoints.length}</div>
+                                <div className="text-2xl font-semibold text-primary">{batch.touchPoints?.length || 0}</div>
                                 <div className="text-xs text-tertiary">Touch Points</div>
                             </div>
                             <div>