Add Show/Hide Transitions for Dialogue Text Animation

[BluePixelDev]

Description:
Improve the dialogue system by implementing animated transitions for text appearance and disappearance. This will enhance the user experience by making dialogue feel more dynamic and readable.

Requirements:

• Implement show and hide transitions for dialogue characters.

• Transitions should not rely on TextMeshPro's internal visibility.

• Instead, track character visibility state manually, including:

  • When a character becomes visible
  • When a character is hidden

• Add fallback transitions such as:

  • Fade-in for character appearance
  • Fade-out for character disappearance

Goal:
Ensure smooth, customizable text animations independent of TextMeshPro limitations, allowing for consistent timing control and improved visual effects.

Notes:

• Use internal timing for transitions (e.g., timestamps or frame-based counters).
• Ensure performance is considered if per-character tracking is used.