fix(projects): responsible-person picker shows only active users with projects.view

The create-project modal's 'Zodpovědná osoba' select listed every user
(including inactive ones). Filter the query server-side by projects.view and
hide inactive users client-side.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/admin/pages/Projects.tsx

@@ -98,7 +98,12 @@ export default function Projects() {
     ...offerCustomersOptions(),
     enabled: showCreate,
   });
-  const usersQuery = useQuery({ ...userListOptions(), enabled: showCreate });
+  // Responsible-person picker: only users whose role can view projects
+  // (projects.view, filtered server-side) and who are active.
+  const usersQuery = useQuery({
+    ...userListOptions("projects.view"),
+    enabled: showCreate,
+  });
   const nextNumberQuery = useQuery({
     ...projectNextNumberOptions(),
     enabled: showCreate,
@@ -512,11 +517,13 @@ export default function Projects() {
                 className="admin-form-input"
               >
                 <option value="">— nepřiřazeno —</option>
-                {(usersQuery.data ?? []).map((u) => (
-                  <option key={u.id} value={u.id}>
-                    {u.first_name} {u.last_name}
-                  </option>
-                ))}
+                {(usersQuery.data ?? [])
+                  .filter((u) => u.is_active)
+                  .map((u) => (
+                    <option key={u.id} value={u.id}>
+                      {u.first_name} {u.last_name}
+                    </option>
+                  ))}
               </select>
             </FormField>
           </div>