v1.0.4 - Achievements & Hints update

– Added Steam achievements. Existing players will unlock earned achievements retroactively when loading the game.

– Added Hint Coins, which can be spent to reveal a random empty or incorrectly filled cell. Revealed cells are permanently locked, spent coins cannot be recovered, and more Hint Coins are earned by revealing the map.

– Cell Counting has been renamed to Cell Marking, with a new Sticky option. The default Temporary mode works as before, while Sticky marks remain on the board until cleared.

– Cell Marking no longer marks inert cells or Blue Cores.

– Added controller and keyboard support for navigating the Puzzle UI overlay.

– Fixed some button bindings and key input combinations not working consistently.

– Tweaked the Windows icon setup to make the generic icon issue less likely to appear.

– Polished the radio button layout.

Small follow-up:

– Added an option to hide the Hint Coin wallet.