Fix notebook drag highlight and add drag-to-tag and drag-to-trash support

src/app/api/notes/[id]/route.ts

@@ -188,6 +188,19 @@ export async function PATCH(
       }
     }
 
+    if (body.addTagId && typeof body.addTagId === 'string') {
+      await prisma.noteTag.createMany({
+        data: [{ noteId: id, tagId: body.addTagId }],
+        skipDuplicates: true,
+      });
+    }
+
+    if (body.removeTagId && typeof body.removeTagId === 'string') {
+      await prisma.noteTag.deleteMany({
+        where: { noteId: id, tagId: body.removeTagId },
+      });
+    }
+
     const updated = await prisma.note.update({
       where: { id },
       data,