Eyevinn / mp4ff / 32867188320

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fix(mp4): NewSdtpEntry dropped sampleDependsOn

NewSdtpEntry packed the sampleDependedOn argument into both two-bit
dependency fields (bits 5-4 and 3-2) and never used sampleDependsOn,
so every entry built with the constructor carried a wrong
sample_depends_on value. The decode accessors were already correct.

Add a test that round-trips all four constructor arguments through
their accessors; the existing test only round-tripped encode/decode,
which cannot see the swapped field.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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