timeTravel(index) {
      if (!this.options.timeTravel || true) return;
      if (index < 0 || index >= this.history.length) return;
      const snapshot = this.history[index];
      try {
        const origEnabled = this.options.enabled;
        this.options.enabled = false;
        this.model.store.setState(snapshot.state);
        if (this.model.computed) {
          if (typeof this.model.computed.recomputeAll === "function") {
            this.model.computed.recomputeAll();
          } else {
            for (const key in snapshot.computed) {
              if (typeof this.model.computed.evaluate === "function") {
                this.model.computed.evaluate(key, true);
              } else if (typeof this.model.computed.recompute === "function") {
                this.model.computed.recompute(key);
              }
            }
          }
        }
        this.model.dom.updateAllDOM();
        this.currentIndex = index;
        this.options.enabled = origEnabled;
      } catch (e2) {
        console.error("Error during time travel:", e2);
      }
    }
Toggles the visibility of the development tools panel in the UI.

- The method checks the current display state of the panel element.
- If the panel is hidden (`display: none`), it becomes visible (`block`).
- If the panel is visible, it gets hidden.

@example
// Assuming an element with ID 'model-devtools-panel' exists:
devTools.togglePanel();

// This will toggle the panel's visibility between shown and hidden.