Universe levels

Debug page — every level the generator knows, straight from levelOrder. Each preview shows the board as the player meets it — the givens tinted, the marks on their edges — with the solution's icons drawn faintly everywhere so a rule breach is visible. The checks under each board are re-derived from the JSON: counts per line, runs of three, marks against the solution, and clue totals. The asset stamp and the PGSDK flavor belong to the container, not to this game.