Itahuka Studio Clean Switch Fix

Replace:
studio.php
assets/studio.css
assets/studio.js

Fixes:
- 1-Up shows only first staged guest.
- 2-Up shows only first two staged guests.
- News shows first three staged guests.
- Grid shows all staged guests.
- Same layout is applied to visible PROGRAM and output canvas.
- UI is compact. Descriptions/tips/log blocks are removed.
