Module rendering 

Rendering primitives: text engine, UI draw helpers, e-ink constants.

• text_render - HarfBuzz shaping + fontdue rasterization -> RGB565
• common - shared rendering state (IS_RTL) and body-text size constant
• layout - word_wrap_bytes() and sentences_with_ranges() (pure text)
• draw - progress bars, rounded rects, nav bars (RGB565 byte-buffer ops)
• eink - MXCFB ioctl structs, waveform constants, diff_rows()

Modules

common

Shared rendering state and constants.

draw

eink

E-ink framebuffer constants, MXCFB ioctl structs, and row-diff helper.

layout

Pure text-layout functions: word wrapping and sentence segmentation.

loader

Loading indicators for splash and loading screens.

text_render