Allow cross-store staff selection

backend/src/main/java/com/petshop/backend/controller/DropdownController.java

@@ -156,13 +156,20 @@ public class DropdownController {
         );
     }
 
-    @GetMapping("/stores/{storeId}/employees")
+    @GetMapping({"/stores/{storeId}/employees", "/employees"})
     @PreAuthorize("hasAnyRole('CUSTOMER', 'STAFF', 'ADMIN')")
-    public ResponseEntity<List<DropdownOption>> getStoreEmployees(@PathVariable Long storeId) {
+    public ResponseEntity<List<DropdownOption>> getStoreEmployees(@PathVariable(required = false) Long storeId) {
+        List<EmployeeStore> employees;
+        if (storeId == null || storeId == 0) {
+            employees = employeeStoreRepository.findActiveAllOrderByEmployeeEmployeeIdAsc();
+        } else {
+            employees = employeeStoreRepository.findActiveByStoreStoreIdOrderByEmployeeEmployeeIdAsc(storeId);
+        }
         return ResponseEntity.ok(
-                employeeStoreRepository.findActiveByStoreStoreIdOrderByEmployeeEmployeeIdAsc(storeId).stream()
+                employees.stream()
                         .filter(this::isAssignableEmployee)
                         .map(this::toEmployeeOption)
+                        .distinct()
                         .collect(Collectors.toList())
         );
     }

backend/src/main/java/com/petshop/backend/repository/EmployeeStoreRepository.java

@@ -15,4 +15,7 @@ public interface EmployeeStoreRepository extends JpaRepository<EmployeeStore, Em
 
     @Query("SELECT es FROM EmployeeStore es WHERE es.store.storeId = :storeId AND es.employee.isActive = true ORDER BY es.employee.employeeId ASC")
     List<EmployeeStore> findActiveByStoreStoreIdOrderByEmployeeEmployeeIdAsc(@Param("storeId") Long storeId);
+
+    @Query("SELECT es FROM EmployeeStore es WHERE es.employee.isActive = true ORDER BY es.employee.employeeId ASC")
+    List<EmployeeStore> findActiveAllOrderByEmployeeEmployeeIdAsc();
 }

backend/src/test/java/com/petshop/backend/controller/DropdownControllerTest.java

@@ -125,6 +125,33 @@ class DropdownControllerTest {
         assertEquals(Long.valueOf(7L), response.getBody().get(0).getId());
     }
 
+    @Test
+    void getStoreEmployeesReturnsAllStaffWhenStoreIdIsNull() {
+        StoreLocation store = new StoreLocation();
+        store.setStoreId(1L);
+
+        Employee staffEmployee = new Employee();
+        staffEmployee.setEmployeeId(7L);
+        staffEmployee.setUserId(7L);
+        staffEmployee.setFirstName("Alex");
+        staffEmployee.setLastName("Jones");
+        staffEmployee.setIsActive(true);
+
+        User staffUser = new User();
+        staffUser.setId(7L);
+        staffUser.setRole(User.Role.STAFF);
+        staffUser.setActive(true);
+
+        when(employeeStoreRepository.findActiveAllOrderByEmployeeEmployeeIdAsc())
+                .thenReturn(List.of(new EmployeeStore(staffEmployee, store)));
+        when(userRepository.findById(7L)).thenReturn(Optional.of(staffUser));
+
+        var response = controller.getStoreEmployees(null);
+
+        assertEquals(1, response.getBody().size());
+        assertEquals(Long.valueOf(7L), response.getBody().get(0).getId());
+    }
+
     @Test
     void getStoreEmployeesExcludesInactiveStaffUsers() {
         StoreLocation store = new StoreLocation();

desktop/src/main/java/org/example/petshopdesktop/api/endpoints/DropdownApi.java

@@ -121,4 +121,12 @@ public class DropdownApi {
         }
         return apiClient.getObjectMapper().readValue(response, new TypeReference<List<DropdownOption>>() {});
     }
+
+    public List<DropdownOption> getEmployees() throws Exception {
+        String response = apiClient.getRawResponse("/api/v1/dropdowns/employees");
+        if (response == null || response.isEmpty()) {
+            throw new IllegalStateException("Empty response from all employees endpoint");
+        }
+        return apiClient.getObjectMapper().readValue(response, new TypeReference<List<DropdownOption>>() {});
+    }
 }

desktop/src/main/java/org/example/petshopdesktop/controllers/dialogcontrollers/AdoptionDialogController.java

@@ -95,7 +95,12 @@ public class AdoptionDialogController {
         new Thread(() -> {
             try {
                 Long storeId = UserSession.getInstance().getStoreId();
-                List<DropdownOption> employees = storeId != null && storeId > 0 ? DropdownApi.getInstance().getStoreEmployees(storeId) : List.of();
+                List<DropdownOption> employees;
+                if (storeId != null && storeId > 0) {
+                    employees = DropdownApi.getInstance().getStoreEmployees(storeId);
+                } else {
+                    employees = DropdownApi.getInstance().getEmployees();
+                }
                 Platform.runLater(() -> {
                     cbEmployee.setItems(FXCollections.observableArrayList(employees));
                     applySelectedEmployee();

desktop/src/main/java/org/example/petshopdesktop/controllers/dialogcontrollers/AppointmentDialogController.java

@@ -427,9 +427,12 @@ public class AppointmentDialogController {
         new Thread(() -> {
             try {
                 Long storeId = UserSession.getInstance().getStoreId();
-                List<DropdownOption> employees = storeId != null && storeId > 0
+                List<DropdownOption> employees;
-                        ? DropdownApi.getInstance().getStoreEmployees(storeId)
+                if (storeId != null && storeId > 0) {
-                        : List.of();
+                    employees = DropdownApi.getInstance().getStoreEmployees(storeId);
+                } else {
+                    employees = DropdownApi.getInstance().getEmployees();
+                }
                 Platform.runLater(() -> {
                     cbEmployee.setItems(FXCollections.observableArrayList(employees));
                     applySelectedEmployee();