Lilith River fb1afc81e9 fix: handle WhiteIsZero for non-standard sub-byte depths (3/5/6/7-bit) ...

For sub-byte depths where samples cross byte boundaries (3, 5, 6, 7-bit),
byte-wise NOT corrupts samples. Added per-sample inversion that extracts
each N-bit sample from the packed stream, computes (max - value), and
writes it back.

Tests cover:
- 3/5/7-bit BlackIsZero (verify basic decoding)
- 3-bit and 6-bit WhiteIsZero (verify per-sample inversion)

2026-03-10 06:02:19 -06:00

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