feat: add display UI with splash screen, dashboard, and RSSI sparkline

Implement full SSD1306 OLED display support:
- Splash screen on boot (1.5s) with project name, version, board
- Dashboard showing radio state, config, counters, RSSI/SNR
- RSSI history sparkline (64-sample ring buffer, 2px-wide bars)
- DisplayOn/DisplayOff host commands routed via dedicated channel
- Pure render functions against generic DrawTarget (no hardware coupling)
- Display on/off control bypasses radio task entirely

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

vendor/esp-hal-embassy/CHANGELOG.md

@@ -0,0 +1,68 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+
+### Changed
+
+### Fixed
+
+### Removed
+
+## 0.5.0 - 2024-11-20
+
+### Added
+
+- `ESP_HAL_EMBASSY_LOW_POWER_WAIT` configuration option. (#2329)
+
+### Changed
+
+- Reduce memory footprint by 4 bytes on multi-core MCUs.
+
+### Fixed
+
+- Alarm interrupts are now handled on the core that allocated them. (For executors created on the second core after calling `esp_hal_embassy::init`) (#2451)
+
+### Removed
+
+## 0.4.0 - 2024-10-10
+
+### Changed
+
+- MSRV bump to 1.79 (#2156)
+
+### Removed
+
+- Removed the `clocks` parameter from `esp_hal_embassy::init`. (#1999)
+
+## 0.3.0 - 2024-08-29
+
+### Added
+
+- This package now re-exports the `esp_hal_procmacros::main` macro (#1828)
+
+### Changed
+
+- Updated to latest release (`0.6.0`) for `embassy-executor` (#1942)
+- Changed `init` to accept timers of multiple types (#1957, #2012)
+
+### Fixed
+
+- Fixed a bug where the timeout was huge whenever the timestamp at the time of scheduling was already in the past (#1875)
+- Fixed interrupt executors looping endlessly when `integrated-timers` is used. (#1936)
+
+## 0.2.0 - 2024-07-15
+
+### Changed
+
+- Removed the TIMG and SYSTIMER time drivers, replaced by a generic time driver taking `OneShotTimer<ErasedTimer>` (#1753)
+
+## 0.1.0 - 2024-06-04
+
+[Unreleased]: https://github.com/esp-rs/esp-hal/commits/main/esp-hal-embassy?since=2024-11-20