Method toggleOption

src/components/question-prompt.ts:144–152

(idx: number)

  }

  private toggleOption(idx: number): void {
    const label = this.questions[this.activeTab].options[idx].label;
    const set = this.selected[this.activeTab];
    if (set.has(label)) {
      set.delete(label);
    } else {
      set.add(label);
    }
  }

  /** After a single-select answer, jump to the next unanswered tab, or Submit. */
  private advance(): void {