Add project transfer controls

src/app/projects/[projectId]/page.tsx

@@ -12,6 +12,7 @@ import {
   createRoom,
   deleteProjectDevice,
   disconnectProjectDeviceRows,
+  exportProjectTransfer,
   getProjectDeviceSyncPreview,
   listCircuitLists,
   listDistributionBoards,
@@ -20,6 +21,7 @@ import {
   listProjectDevices,
   listProjects,
   listRooms,
+  importProjectTransfer,
   synchronizeProjectDeviceRows,
   updateProjectDevice,
   updateProjectSettings,
@@ -349,6 +351,67 @@ export default function ProjectDetailPage() {
     }
   }
 
+  async function handleExportProject() {
+    if (!project) {
+      return;
+    }
+    setIsSaving(true);
+    setError(null);
+    try {
+      const transfer = await exportProjectTransfer(project.id);
+      const blob = new Blob([JSON.stringify(transfer, null, 2)], {
+        type: "application/json",
+      });
+      const url = URL.createObjectURL(blob);
+      const anchor = document.createElement("a");
+      anchor.href = url;
+      anchor.download = `${project.name.replace(/[^a-zA-Z0-9_-]+/g, "-") || "projekt"}.leistungsbilanz.json`;
+      anchor.click();
+      URL.revokeObjectURL(url);
+    } catch (err) {
+      setError(
+        err instanceof Error
+          ? err.message
+          : "Projekt konnte nicht exportiert werden."
+      );
+    } finally {
+      setIsSaving(false);
+    }
+  }
+
+  async function handleImportProject(
+    transfer: unknown,
+    mode: "replace" | "duplicate"
+  ) {
+    if (!project) {
+      return;
+    }
+    setIsSaving(true);
+    setError(null);
+    try {
+      const result = await importProjectTransfer(
+        project.id,
+        mode,
+        project.currentRevision,
+        transfer
+      );
+      if (mode === "duplicate" && "projectId" in result) {
+        window.location.href = `/projects/${result.projectId}`;
+        return;
+      }
+      window.location.reload();
+    } catch (err) {
+      setError(
+        err instanceof Error
+          ? err.message
+          : "Projektdatei konnte nicht importiert werden."
+      );
+      setIsProjectSettingsOpen(false);
+    } finally {
+      setIsSaving(false);
+    }
+  }
+
   async function openProjectDeviceSyncPreview(projectDeviceId: string) {
     if (!projectId) {
       return;
@@ -1015,6 +1078,8 @@ export default function ProjectDetailPage() {
         <ProjectSettingsModal
           isSaving={isSaving}
           onClose={() => setIsProjectSettingsOpen(false)}
+          onExport={handleExportProject}
+          onImport={handleImportProject}
           onSave={handleSaveProjectSettings}
           project={project}
         />