On-screen direction arrows:

- Added optional on-screen direction arrows (Settings > Arrows) for mouse click and keyboard/gamepad movement/rotation feedback, hidden during menus and dialogue
- Direction arrows always off on new game, saved as part of game data not PlayerPrefs
- Added optional direction arrows setting for mouse-click movement/rotation with click/keypress flash feedback

Potions fixes:

- Fixed Health/Mana Potions used from the inventory screen not visibly restoring the portrait bar (the HP/MP value updated internally but nothing refreshed the bar's fill)
- Fixed Strength Potion and Cure Poison Potion doing nothing when used from the combat/menu potion list — that menu had its own separate copy of the potion-use logic which never handled Strength Potion and still had Cure Poison Potion as a TODO stub; it now shares the same logic as the inventory screen instead of duplicating it
- Checked all potions work as intended
- Swapped keyboard interact/cancel to X/Z to match on-screen prompts; updated how to play

Keyboard controls updated:

- Interaction section: now states Button A = X/Space/Enter, Button B = Z/Escape on keyboard, plus the Xbox/PSX mappings, and notes Space/Enter/numpad Enter all confirm even though the
prompt shows "X"
- Equipment section: Button B close-prompt now says Escape or Z (was X)
- Spell-casting section: key list reordered to x/enter/escape/z to match

Stairs down doors:

- Fixed stairs down door not responding to interaction button, and no longer taking us down a floor (Watchfort and Goblin Camp)
- Fixed stairs-down door skipping a floor when interacted with twice quickly (double floor increment)