Kaia Counter Test v0.5.4 — SUCCESS Display

Source generation:
- Created by copying v0.5.3.
- v0.5.3 source remains the untouched predecessor.

Change:
- During cooldown, replace the disabled GOT IT! button with:
  SUCCESS (small/subdued)
  GOT IT! (large/bold)
- After cooldown, GET NUMBER returns.

Checks:
- PHP syntax check passed.
- No raw <style> block appended outside PHP.
- Existing counter/history logic retained.
