Add More Route Transition Animations

[Einswilli]

Currently, FletX only includes a few basic animated transitions between routes. To enhance the user experience, we’d love to introduce a wider variety of smooth and visually appealing route transition animations.

What we're looking for:

• New transition styles (e.g., custom curves)
• Clean and reusable animation logic

This will make the flex route transition system feel more polished and modern ✨