fix: address code review feedback - add error handling and fix import style

Co-authored-by: ZimengXiong <83783148+ZimengXiong@users.noreply.github.com>

backend/src/__tests__/user-sandboxing.test.ts

@@ -8,6 +8,7 @@
  */
 
 import { describe, it, expect, beforeAll, afterAll, beforeEach } from "vitest";
+import bcrypt from "bcrypt";
 import {
   getTestPrisma,
   cleanupTestDb,
@@ -28,7 +29,6 @@ describe("User Data Sandboxing", () => {
     prisma = getTestPrisma();
 
     // Create two test users
-    const bcrypt = require("bcrypt");
     const hashA = await bcrypt.hash("passwordA", 10);
     const hashB = await bcrypt.hash("passwordB", 10);
 

backend/src/index.ts

@@ -797,6 +797,7 @@ io.on("connection", (socket) => {
       drawingId: string;
       user: Omit<User, "socketId" | "isActive">;
     }) => {
+      try {
         // Verify the authenticated user owns this drawing
         if (authenticatedUserId) {
           const drawing = await prisma.drawing.findFirst({
@@ -821,6 +822,10 @@ io.on("connection", (socket) => {
         roomUsers.set(roomId, filteredUsers);
 
         io.to(roomId).emit("presence-update", filteredUsers);
+      } catch (err) {
+        console.error("Error in join-room handler:", err);
+        socket.emit("error", { message: "Failed to join room" });
+      }
     }
   );