input-field: fix width animations

[PaideiaDilemma]

This fixes some problems with the input field resize.

• support fading to a smaller size
• don't draw the shadow when fading
• don't draw the asset when the input field size is to small

Motivated me to start porting hyprlands animation manager to hyprlock.

[vaxerski]

Motivated me to start porting hyprlands animation manager to hyprlock.

if you want to do that, (imho not a bad idea) throw it into hyprutils.

[PaideiaDilemma]

@vaxerski wouldn't hyprgraphics make more sense?

[vaxerski]

no?