Create casting HUD indicators

[LinkofOrigin]

Currently the player has no feedback upon activating an echo/ability.

• Eg. When casting "Fireball", a HUD panel appears with a progress bar as the cast timer and the name of the ability being cast.

[jiarongmai]

/attempt #267

I'm interested in creating the casting HUD indicators. I'll implement:

Approach:

1. Create HUD panel that appears when casting
2. Progress bar showing cast timer
3. Display ability name being cast
4. Smooth animations for panel appearance/disappearance
5. Clear visual feedback for cast completion

Relevant Experience: Game UI development, HUD systems, progress indicators

I can start immediately!

[zhaog100]

/attempt