fix

pico2_common: fix 1-line vertical shift in DVI output

Pre-encoding a black scanline into q_tmds_valid before dvi_start() caused
a permanent 1-line offset, making the bottom framebuffer row appear at the
top of the DVI screen. Fix by pre-encoding scanline 0 actual content and
starting the main loop at scanY=1.

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

fix README

fix README

Fix ST7789 RGB565 color mismatch caused by RAMCTRL little-endian byte…

… order

RAMCTRL (0xB0) with P2 bit 3 = 1 puts the ST7789 into little-endian mode
(low byte sent first over SPI). LcdTap now parses this bit and assembles
RGB565 pixels in the correct byte order accordingly.

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

fix OSD UI

Add command dump viewer to OSD

- LcdTap: add dump buffer (256 entries) that captures command/data bytes
  and HW reset events; starts in ACTIVE state on power-on
- Osd: add DUMP_VIEW state with hex viewer (colored by entry type),
  color buffer (textCol_) for per-character RGB565 palette rendering,
  and "View Dump" action in the main menu

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

fix README

fix README

add LcdTapConfig.swapRB and PIN_CFG_SWAP_RB (GPIO 22)

- Add bool swapRB to LcdTapConfig; in updateWriteCache() the MADCTL BGR
  bit is XOR'd with swapRB so the R/B swap can be overridden at boot time
  independently of the LCD command stream.
- Move PIN_CFG_CLK_MODE from GPIO 22 to GPIO 0 in pico2_st7789.
- Add PIN_CFG_SWAP_RB = GPIO 22 to both pico2_st7789 and pico2_3line_spi;
  LOW (default) = no swap, HIGH = swap R and B channels.
- Update README files and schematics accordingly.

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