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fix(olv): correct TGA endianness and stamp alpha for Wii U
Two fixes:
- TGA width/height stored big-endian: nn_olv reads them as native u16 on
PPC without byte-swapping, so LE values (0x64 0x00) were read as 25600
instead of 100, causing ResultInvalidFormat from AddStampData.
- Stamps: white pixels → alpha=0 (transparent), black pixels → opaque.
Source PNGs are RGB (no alpha); white is background, not stamp content.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>