ClayGrounds v0.2.7 — crash-safe loading HUD patch

- Preserves the v0.2.5/v0.2.6 TamaCrafti-style 374-step map builder and ~2x construction cadence.
- Removes per-tick center-screen title/subtitle refreshes introduced in v0.2.6.
- Adds #ui_clock and refreshes loading HUD only once every 20 game ticks (~1 second).
- Keeps the large BUILDING CLAYGROUNDS title visible with a 25-tick stay time so 1 Hz updates overlap cleanly.
- Keeps bossbar and actionbar as low-frequency fallbacks.
- Keeps a one-shot Preparing world build... title at startup and one-shot CLAYGROUNDS READY title at completion.
- No terrain, fountain, combat, encounter, class altar, enemy anchor, or resource-model changes.
