Persist project locations

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

@@ -204,14 +204,19 @@ export default function ProjectDetailPage() {
 
   async function handleCreateFloor(event: FormEvent<HTMLFormElement>) {
     event.preventDefault();
-    if (!projectId || !floorName.trim()) {
+    if (!projectId || !project || !floorName.trim()) {
       return;
     }
     setIsSaving(true);
     setError(null);
     try {
-      const created = await createFloor(projectId, { name: floorName.trim() });
-      setFloors((current) => [...current, created]);
+      const result = await createFloor(
+        projectId,
+        { name: floorName.trim() },
+        project.currentRevision
+      );
+      setFloors((current) => [...current, result.floor]);
+      applyProjectRevision(result.history.currentRevision);
       setFloorName("");
     } catch (err) {
       setError(err instanceof Error ? err.message : "Etage konnte nicht erstellt werden.");
@@ -222,18 +227,28 @@ export default function ProjectDetailPage() {
 
   async function handleCreateRoom(event: FormEvent<HTMLFormElement>) {
     event.preventDefault();
-    if (!projectId || !roomNumber.trim() || !roomName.trim()) {
+    if (
+      !projectId ||
+      !project ||
+      !roomNumber.trim() ||
+      !roomName.trim()
+    ) {
       return;
     }
     setIsSaving(true);
     setError(null);
     try {
-      const created = await createRoom(projectId, {
-        floorId: roomFloorId || undefined,
-        roomNumber: roomNumber.trim(),
-        roomName: roomName.trim(),
-      });
-      setRooms((current) => [...current, created]);
+      const result = await createRoom(
+        projectId,
+        {
+          floorId: roomFloorId || undefined,
+          roomNumber: roomNumber.trim(),
+          roomName: roomName.trim(),
+        },
+        project.currentRevision
+      );
+      setRooms((current) => [...current, result.room]);
+      applyProjectRevision(result.history.currentRevision);
       setRoomNumber("");
       setRoomName("");
       setRoomFloorId("");