feat(agenda): Epic 4 - EPD Koppeling (appointment-report integration)

Implements bidirectional linking between appointments and reports:
- E4.S1: Create report from appointment modal with encounter pre-linked
- E4.S2: Link existing reports to appointments via EncounterSelector
- E4.S3: Show linked reports in appointment modal edit view
- E4.S4: Navigation between appointments and reports with deep linking

Also includes bug fixes for patient search:
- Fix FHIR to internal format mapping for patient data
- Fix debounced search interference after patient selection
- Fix UUID handling for optional practitioner_id

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/api/fhir/Patient/route.ts

@@ -26,20 +26,44 @@ export async function GET(request: NextRequest) {
     // Build query
     let query = supabaseAdmin.from('patients').select('*');
 
-    // Search by name (family or given)
+    // General search (searches name, BSN, and client number)
+    const q = searchParams.get('q');
+    if (q) {
+      // Check if input looks like a number (BSN or client number)
+      const isNumeric = /^\d+$/.test(q.trim());
+      if (isNumeric) {
+        // Search BSN and client number
+        query = query.or(
+          `identifier_bsn.ilike.%${q}%,identifier_client_number.ilike.%${q}%`
+        );
+      } else {
+        // Search name fields
+        query = query.or(
+          `name_family.ilike.%${q}%,name_given.cs.{${q}}`
+        );
+      }
+    }
+
+    // Search by name (family or given) - legacy support
     const name = searchParams.get('name');
-    if (name) {
+    if (name && !q) {
       query = query.or(
         `name_family.ilike.%${name}%,name_given.cs.{${name}}`
       );
     }
 
-    // Search by identifier (BSN)
+    // Search by identifier (BSN) - legacy support
     const identifier = searchParams.get('identifier');
-    if (identifier) {
+    if (identifier && !q) {
       query = query.eq('identifier_bsn', identifier);
     }
 
+    // Search by client number
+    const clientNumber = searchParams.get('clientNumber');
+    if (clientNumber && !q) {
+      query = query.ilike('identifier_client_number', `%${clientNumber}%`);
+    }
+
     // Search by birth date
     const birthdate = searchParams.get('birthdate');
     if (birthdate) {
@@ -55,6 +79,15 @@ export async function GET(request: NextRequest) {
     // Order by updated_at descending (newest first)
     query = query.order('updated_at', { ascending: false });
 
+    // Limit results (_count parameter)
+    const count = searchParams.get('_count');
+    if (count) {
+      const limit = parseInt(count, 10);
+      if (!isNaN(limit) && limit > 0) {
+        query = query.limit(limit);
+      }
+    }
+
     // Execute query
     const { data: patients, error } = await query;