fix: hide labels during animations until event objects fully appear

[Shivansh1205]

Summary

This PR fixes an issue where labels were appearing too early during animations,
causing them to overlap with partially-drawn tracks, jets, hits, and other event
objects. The labels now remain hidden during the animation and correctly reappear
once all animated objects are fully visible.

Problem

Previously, the Labels group was always visible, even while geometry drawRanges,
track propagation, and event-generation animations were still in progress.
This resulted in:

• Labels floating in empty space before the objects were drawn
• Visual clutter during track growth and hit expansion
• Poor visual coherence during preset camera animations and clipping animations

Fix

Labels are now toggled via visibility control during animation:

• Hidden at animation start
• Shown again when animation finishes

This behavior is applied consistently in all animation entrypoints:

• animateEvent
• animateEventWithClipping
• animatePreset

A unified approach is used for all three to ensure consistent UX across all animation modes.

Implementation Details

• Added label-hide logic at the beginning of each animation function:

  const labelsGroup = this.scene.getObjectByName(SceneManager.LABELS_ID);
  if (labelsGroup) labelsGroup.visible = false;