Add Xteink X3 support + fix image fit-box orientation#3

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casualducko wants to merge 6 commits into

b1rdmania:mainfrom

casualducko:x3-support

Commits on Jun 6, 2026

Add Xteink X3 support with device toggle

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X3: use 4-level grayscale, document stock firmware image limitation

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Remove PR draft accidentally included in previous commit

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Document stock firmware EPUB image limitation for X4 as well

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Fix stale comments: no 2-level profile, no reader upscaling

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Address review: explicit Optional annotation, validate device against DEVICE_PROFILES

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