Feat 318 bulk creation error

[karimouf]

Overview

This PR fixes two frontend issues:

1. Error toasts disappeared after 5s — not enough time to read longer messages, forcing users to resubmit just to re-read the error
2. Bulk assignment creation threw Assignment with ID X not found and left the modal open (even though the assignment was created successfully server-side), because the CSV-export step referenced documentsTable, submissionsTable, and reviewer — none of which exist on AssignmentModal.vue

---

Improvements

• Error toasts now display for 10 seconds instead of 5, giving users enough time to read longer error messages without resubmitting

---

Bug fixes

• Fixed: bulk assignment creation getting stuck with the modal open and a console error after a successful create — the CSV-export step referenced non-existent component properties (documentsTable, submissionsTable, reviewer), which broke the lookup and prevented onSuccess() (modal close + success toast) from running. Now uses the component's actual state (assignmentModalValue, selectedReviewer)
• Removed: the assignmentType === 'document' ? ... : ... branch used to pick which table to search — the list being searched (assignmentModalValue) already only contains items of the currently active assignment type, making the branch redundant. It was also wrong for the study_session type, which incorrectly fell into the submission branch
  snippet of old create bulk assignment function:

this.$socket.emit("assignmentCreateBulk", socketData, (res) => {
        this.$refs.assignmentStepper.stopProgress();
        if (res.success) {
          if (this.reviewerSelectionMode.mode === 'role') {

            const filename = "assignments";
            const returnData = Object.keys(res.data).map((assignmentId) => {
              let assignment = null;
              if (this.assignmentType === 'document') {
                assignment = this.documentsTable.find((document) => document.id === Number(assignmentId));
              } else {
                assignment = this.submissionsTable.find((submission) => submission.id === Number(assignmentId));
              }
              if (!assignment) {
                console.error(`Assignment with ID ${assignmentId} not found.`);
                return null;
              }

              const assignmentUser = this.reviewer.find((reviewer) => reviewer.id === assignment.userId);
              const reviewer = res.data[assignmentId];

              const csv = {
                "assignedToName": assignmentUser.firstName + " " + assignmentUser.lastName,
                "assignedToFirstName": assignmentUser.firstName,
                "assignedToLastName": assignmentUser.lastName,
              }

              reviewer.forEach((reviewerId, index) => {
                const reviewerUser = this.reviewer.find((reviewer) => reviewer.id === Number(reviewerId));
                csv[`reviewer_${index + 1}`] = reviewerUser.firstName + " " + reviewerUser.lastName;
              });

              return csv;
            });

            downloadObjectsAs(returnData, filename, "csv");
          }
          this.$refs.assignmentStepper.close();
          this.eventBus.emit("toast", {
            title: "Assignment created",
            message: "The assignment has been created successfully",
            variant: "success",
          });
        } else {
          this.eventBus.emit("toast", {
            title: "Failed to create assignment",
            message: res.message,
            variant: "danger",
          });
        }
      })
    }

[bingobongomann]

Tested it on the full eiwa data assign 7500 sessions in around 2500 studies. It took almost 10min to finish but ran without any issues