fix: handle backslash zip paths, missing styles.xml, and arithmetic overflows#311

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developer0hye wants to merge 2 commits intoMathNya:masterfrom

developer0hye:fix/panic-safety-v2

Commits on Mar 1, 2026

fix: replace panic-causing unwrap() calls with graceful error handling
developer0hye
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fix: handle backslash zip paths, missing styles.xml, and arithmetic overflows
developer0hye
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