Implement local browser caching for shared groups and UI improvements

src/services/deckService.ts

@@ -33,10 +33,11 @@ export async function getDeckWithCards(deckId: string) {
 export async function createDeckFromImport(
   classId: string,
   data: FlashcardImportData,
-  overrideName?: string
+  overrideName?: string,
+  groupId?: string | null
 ) {
   const maxOrder = await prisma.deck.aggregate({
-    where: { classId },
+    where: { classId, groupId: groupId || null },
     _max: { sortOrder: true },
   });
   const sortOrder = (maxOrder._max.sortOrder ?? -1) + 1;
@@ -44,6 +45,7 @@ export async function createDeckFromImport(
   return prisma.deck.create({
     data: {
       classId,
+      groupId: groupId || null,
       name: overrideName || data.deckName,
       description: data.description,
       sortOrder,