refactor(graphics): unique_ptr ownership for display buffers

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- TFTDisplay: linePixelBuffer/repaintChunkBuffer become
  unique_ptr<uint16_t[]> (nothrow allocation preserves the existing
  OOM log-and-fail path); the destructor's manual free block goes away.

- BaseUIEInkDisplay: panelBuffer becomes unique_ptr<uint8_t[]>; the
  user-written destructor disappears.

- EInkParallelDisplay: epaper and the ghosting dirtyPixels buffer
  become unique_ptr (make_unique zero-initializes, matching the old
  calloc); the destructor keeps only the async-task wait logic.

No behavior change.

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