Walk to School Bingo

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raw = localStorage.getItem(STORAGE_KEY);\n return raw ? new Set(JSON.parse(raw)) : new Set();\n } catch {\n return new Set();\n }\n}\n\nfunction saveMarked(marked) {\n localStorage.setItem(STORAGE_KEY, JSON.stringify([...marked]));\n}\n\nasync function init() {\n const res = await fetch(\"/api/items\");\n const { items } = await res.json();\n\n const rand = seededRandom(todaySeed());\n const shuffled = shuffle(items, rand);\n\n // 5x5 = 25 cells; middle index = 12\n const FREE_INDEX = 12;\n const cells = [];\n let itemIdx = 0;\n for (let i = 0; i < 25; i++) {\n if (i === FREE_INDEX) {\n cells.push({ label: \"FREE\", free: true });\n } else {\n cells.push({ label: shuffled[itemIdx++], free: false });\n }\n }\n\n const marked = loadMarked();\n const board = document.getElementById(\"board\");\n\n cells.forEach((cell, i) => {\n const el = document.createElement(\"div\");\n el.className = \"cell\" + (cell.free ? \" free\" : \"\") + (!cell.free && marked.has(i) ? \" marked\" : \"\");\n if (cell.free) el.classList.add(\"marked\"); // free square always looks marked\n el.textContent = cell.label;\n\n if (!cell.free) {\n function toggle(e) {\n e.preventDefault();\n if (marked.has(i)) {\n marked.delete(i);\n el.classList.remove(\"marked\");\n } else {\n marked.add(i);\n el.classList.add(\"marked\");\n }\n saveMarked(marked);\n }\n el.addEventListener(\"touchstart\", toggle, { passive: false });\n el.addEventListener(\"click\", (e) => {\n // suppress the delayed click fired after touchstart\n if (e.detail === 0) return;\n toggle(e);\n });\n }\n\n board.appendChild(el);\n 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