Save Slot Updates: 20 Slots + UI Rework

Two updates here covering the save slot system.

20 Save Slots

Previously the game had 5 save slots. Now there are 20. All existing saves are untouched and load exactly as before. The extra slots are just there if you want them.

Good for trying out all three protocols, speedrun attempts, or just hoarding saves.

Saves Screen Rework

With 20 slots the old vertical list was way too long, so the saves screen got a full redesign:

• 2-column compact grid layout instead of a single scrolling list
• Sort dropdown at the top: Most Recent (default), Slot Number, Progress, Protocol, or Name
• Slot counter shows how many of your 20 slots are in use
• Empty slots are collapsed into a single "NEW GAME" button at the bottom instead of showing 15+ blank cards
• Double-click any save card to quick-load it
• The saves panel widens automatically to give the grid room, then shrinks back when you go to other menu screens

All existing saves are fully compatible. Nothing was changed about how saves are stored or loaded.