Migrate to Waveshare ESP32-S3-Touch-AMOLED-2.16 with auto-rotation, splash, and battery

Full hardware swap from Panlee SC01 Plus (480×320 IPS) to Waveshare 2.16"
square AMOLED (480×480, CO5300 + CST9220 + AXP2101 + QMI8658). Library
stack moves to Arduino_GFX, SensorLib, XPowersLib on the pioarduino
platform 55.03.38-1 (Arduino Core 3.x).

UI:
- 4 screens (splash, usage, controller, bluetooth) with 3-button physical
  navigation: GPIO 0 = prev, AXP PKEY = cycle, GPIO 18 = next.
- IMU-driven 90° auto-rotation. CO5300 can't rotate via MADCTL, so flush
  callback does CPU strip-rotation in PARTIAL render mode. Rotation
  transitions use AMOLED brightness flash (instant black → redraw → ramp).
- Battery indicator (Lucide icons) in upper-right, RGB565A8 alpha so it
  blends over the splash animations.
- USB plugged/unplugged auto-switches between Usage and Controller
  screens (suppressed while on splash).
- Fonts and icons re-scaled ~1.9× for the higher-DPI panel; 20px margins
  to clear rounded corners.

Splash:
- 13 × 20×20 pixel-art creature animations sourced from
  claudepix.vercel.app via tools/scrape_claudepix.js (scraper handles
  both PRESET creature-engine and standalone FRAMES+PAL formats).
  tools/convert_to_c.js emits firmware/src/splash_animations.h.
  Attribution preserved in README and the generated header.

Tooling:
- tools/png_to_lvgl.js converts alpha PNGs to LVGL RGB565A8 (planar
  layout, with --tint to colorize Lucide black-on-transparent sources).
- tools/scrape_claudepix.js, tools/convert_to_c.js for the splash
  pipeline.

Docs:
- New worktree CLAUDE.md with hardware pin map, file inventory, build
  commands, and the 8 critical gotchas (CO5300 rotation, OPI PSRAM,
  pioarduino requirement, LVGL 9 font patching, centralized touch read,
  even-aligned flush regions, touch swap/mirror values, RGB565A8 layout).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

firmware/platformio.ini

@@ -1,14 +1,16 @@
-[env:sc01plus]
-platform = espressif32
+[env:waveshare_amoled_216]
+platform = https://github.com/pioarduino/platform-espressif32/releases/download/55.03.38-1/platform-espressif32.zip
 board = esp32-s3-devkitc-1
 framework = arduino
+board_build.arduino.memory_type = qio_opi
 upload_speed = 921600
 monitor_speed = 115200
 
 build_flags =
     -DARDUINO_USB_CDC_ON_BOOT=1
-    ; HID is via BLE now, no TinyUSB needed — normal pio upload works
     -DBOARD_HAS_PSRAM
+    ; AXP2101 PMU
+    -DXPOWERS_CHIP_AXP2101
     ; NimBLE config — peripheral-only, single connection
     -DCONFIG_BT_NIMBLE_ROLE_BROADCASTER=1
     -DCONFIG_BT_NIMBLE_ROLE_PERIPHERAL=1
@@ -38,7 +40,9 @@ build_flags =
     -DLV_USE_SNAPSHOT=1
 
 lib_deps =
-    lovyan03/LovyanGFX@^1.1.16
+    moononournation/GFX Library for Arduino@^1.5.6
+    lewisxhe/SensorLib@^0.2.6
+    lewisxhe/XPowersLib@^0.2.7
     lvgl/lvgl@^9.2.0
     bblanchon/ArduinoJson@^7.0.0
     h2zero/NimBLE-Arduino@^2.1.1