Add jump SFX and gameplay background music

Remove gameplay music, use shield.png instead of shield.webp

Use immunity.mp3 for 2x multiplier power-up instead of powerup.mp3

Complete music flow: pause/resume around power-ups, stop on crash

Keep menu music playing during gameplay

Stop power-up SFX when timer expires or on game over

Add SFX: dino head save, game over, immunity, dash

Replace jump SFX with j2.mp3, add game start sound on play

Add power-up and dino head SFX, replace menu music with mm_sfx.mp3

Add hit sound effect on dino crash

Add looping menu music, stops when game starts

Add jump sound effect

Adaptive game loop: extra updates on slow frames, no cap on fast displays

Revert fixed-timestep game loop back to simple loop

Remove landscape enforcement, allow portrait mode on mobile