Dev/mbz

[mbz4]

v0.3.0 — GUIslice touch UI + host control surface

Replaces v0.2.x schema-driven menus with a GUIslice Builder-laid-out touch UI. Adds a host serial control surface so the CYD acts as a remote for an attached Raspberry Pi (volume / mute / mic / power / reboot).

Touch UI: main page (sliders, toggle icons, RSC logo, power, burger, back) + burger popup (debug/theme toggles, live stats: fw / uptime / heap) + power popup (Pi/CYD reboot/poweroff with confirm flow for destructive actions).

Host serial contract: host_vol:NN, host_mute, host_mic, host_poweroff, host_reboot. CYD-side commands stay on existing dispatch table.

Also:

• theme:light|dark preset command + burger toggle, persisted to NVS
• menu_timeout configurable idle return-to-face (suspended while touch_debug:on)
• Display rotation 3 + inverted sliders for the enclosure mount
• Touch debug logging reduced to state transitions + 5 Hz raw cap

Fixes:

• LEDC re-attach after GUIslice's TFT re-init — brightness was silently failing (LEDC channel updated but pin detached)
• BMP24 → RAW1 sweep across all 1bpp icons (BMP24 crashed reading past .rodata)
• 4 duplicate dispatch entries removed (mood, bright, uptime, mem)

Breaking: menu_begin / menu_screen / menu_item / menu_end / menu_select removed; runtime schema-push system replaced by the static GUIslice layout.

Docs: README rewritten for the new architecture; shields + GitHub Actions workflow added.