dangernoodle-io / TaipanMiner / 24089814755

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jae/display dma fix (#50)

* fix: double-buffer display DMA to eliminate text rendering artifacts

spi_device_queue_trans returns before DMA completes, causing corruption
when the static pixel buffer is overwritten for the next character while
the previous transfer is still in flight. Switch to ping-pong double
buffers for draw_text, draw_text_2x, and draw_logo so the previous
buffer's DMA is always drained before reuse.

also switch to Spleen 8x16 bitmap font (BSD licensed, designed for
clean rendering at small sizes)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* feat: switch to Terminus Bold font, add bold splash text

- replace Spleen 8x16 with Terminus Bold (ter-u16b.bdf) for a more
  traditional terminal aesthetic
- add software bold option to draw_text_st7735 (OR each row with
  itself shifted right by 1px)
- apply bold to "TaipanMiner" on boot splash for emphasis

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

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