bug: resource leaks in console hide() and three.js GPU material cache

[YayoRazo]

Description

Two resource leaks in different packages:

1. core/console.ts: hide() does not call stopAutoScroll(). If auto-scroll was started via text selection drag, the 50ms interval continues firing markNeedsRerender() and mutating scroll state even while the console is hidden.

2. three/ExplodingSpriteEffect.ts: static baseMaterialCache is a Map that caches GPU materials but is never cleared. ExplosionManager.disposeAll() disposes all active explosions but leaves the cached materials in GPU memory.

Steps to reproduce

1. Open the console, start a text selection drag to the edge (activates auto-scroll), hide the console — the interval keeps firing
2. Create and dispose multiple ExplodingSpriteEffect instances with different textures — GPU memory grows unboundedly