fix: resolve all 12 debugging bugs in launch checklist app#2

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arunod-wijesena wants to merge 15 commits intocodezelaca:mainfrom

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Commits on May 5, 2026

feat: initialize app logic for launch checklist management
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feat: implement launch checklist management logic in app.js
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feat: implement core checklist management and UI rendering logic in app.js
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Commits on May 8, 2026