X-ray Vision TP

## V1.8

**Bug fix:** Several "see-through" terrain textures (stone, dirt, sand,
sandstone, blackstone, cobblestone, netherrack, and others) were shipping
with a broken alpha value that made them fully invisible instead of the
intended faint x-ray tint. This is now fixed and verified across all
affected textures.

**Rendering improvements:**
- All textures converted to true RGBA (previously a mix of palette and
  RGBA), which is what let the invisibility bug slip through unnoticed —
  more reliable going forward
- Smoothed the glow/bloom halo around ore clusters, which previously had
  a hard-edged cutout causing jagged/shimmery edges at a distance; now a
  soft gradient

**Performance:**
- Re-optimized all textures (pngquant + optipng, max settings) — total
  texture payload is smaller than V1.7 despite adding more visual detail,
  keeping the resource reload screen quick

No new blocks added this version — this release is a quality/reliability
pass on existing coverage. Full ore list and features unchanged from V1.7.