c1d5f5d562
## Problem Three `fopen()` calls in ZipFile.cpp did not check for NULL before using the file handle. If files cannot be opened, `fseek`/`fread`/`fclose` receive NULL and crash. ## Fix Added NULL checks with appropriate error logging and early returns for all three locations: - `getDataOffset()` - `readFileToMemory()` - `readFileToStream()` ## Testing - Builds successfully with `pio run` - Affects: `lib/ZipFile/ZipFile.cpp`