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>

assets/icon_battery-charging.svg

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+</svg>

assets/icon_battery-full.svg

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assets/icon_battery-low.svg

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assets/icon_battery-medium.svg

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+</svg>

assets/icon_battery.svg

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+  <path d="M 22 14 L 22 10" />
+  <rect x="2" y="6" width="16" height="12" rx="2" />
+</svg>