ClayGrounds v0.2.6 — Loading HUD Visibility Fix

- Keeps the v0.2.5 2x TamaCrafti-style progressive world builder unchanged.
- Adds a persistent center-screen BUILDING CLAYGROUNDS title during generation.
- Adds a live subtitle with percent, step count, and approximate seconds remaining.
- Retains the loading boss bar and action bar as redundant fallbacks.
- Shows a center-screen CLAYGROUNDS READY confirmation when generation completes.
- Displays Preparing world build... immediately during the initial 40-tick settle period.
- Does not alter terrain geometry, fountain, combat, encounters, or resource assets.
