feat(sql-library): add move to folder action

apps/desktop/src/stores/savedSqlStore.ts

@@ -453,6 +453,42 @@ export const useSavedSqlStore = defineStore("savedSql", () => {
     await persistFiles([...untouched, ...nextSource, ...nextDestination]);
   }
 
+  async function moveFilesToFolder(fileIds: string[], folderId?: string) {
+    const uniqueIds = [...new Set(fileIds)];
+    if (uniqueIds.length === 0) return;
+
+    const targetFolderId = folderId || undefined;
+    const movingFiles = uniqueIds.map((id) => files.value.find((file) => file.id === id)).filter((file): file is SavedSqlFile => Boolean(file));
+    const filesToMove = movingFiles.filter((file) => (file.folderId || undefined) !== targetFolderId);
+    if (filesToMove.length === 0) return;
+    const moveIdSet = new Set(filesToMove.map((file) => file.id));
+
+    const timestamp = nowIso();
+    const affectedFolderIds = new Set<string>(filesToMove.map((file) => file.folderId || ""));
+    affectedFolderIds.add(targetFolderId || "");
+
+    const movedFiles = filesToMove.map((file) => ({
+      ...file,
+      folderId: targetFolderId,
+      updatedAt: timestamp,
+    }));
+
+    // Reindex each touched folder separately so moving a batch out of one
+    // folder never rewrites unrelated siblings into the destination folder.
+    const nextAffectedFiles = Array.from(affectedFolderIds).flatMap((groupId) => {
+      const normalizedGroupId = groupId || undefined;
+      const remaining = sortFilesByOrder(files.value.filter((file) => (file.folderId || "") === groupId && !moveIdSet.has(file.id)));
+      const group = groupId === (targetFolderId || "") ? [...remaining, ...movedFiles] : remaining;
+      return reindexFiles(group, normalizedGroupId).map((file) => ({
+        ...file,
+        updatedAt: timestamp,
+      }));
+    });
+    const untouched = files.value.filter((file) => !affectedFolderIds.has(file.folderId || "") && !moveIdSet.has(file.id));
+
+    await persistFiles([...untouched, ...nextAffectedFiles]);
+  }
+
   async function reorderFiles(draggedId: string, targetId: string, position: "before" | "after") {
     const dragged = files.value.find((file) => file.id === draggedId);
     const target = files.value.find((file) => file.id === targetId);
@@ -531,6 +567,7 @@ export const useSavedSqlStore = defineStore("savedSql", () => {
     moveFolderToFolder,
     reorderFiles,
     moveFileToFolder,
+    moveFilesToFolder,
     syncToLocalDirectory,
     allFolders,
     allFoldersTreeOrder,