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/esp32s3/src/nrx/nrxpd_ctrl.rs

@@ -0,0 +1,152 @@
+#[doc = "Register `NRXPD_CTRL` reader"]
+pub type R = crate::R<NRXPD_CTRL_SPEC>;
+#[doc = "Register `NRXPD_CTRL` writer"]
+pub type W = crate::W<NRXPD_CTRL_SPEC>;
+#[doc = "Field `DEMAP_FORCE_PD` reader - Force Power Down for Demapper"]
+pub type DEMAP_FORCE_PD_R = crate::BitReader;
+#[doc = "Field `DEMAP_FORCE_PD` writer - Force Power Down for Demapper"]
+pub type DEMAP_FORCE_PD_W<'a, REG> = crate::BitWriter<'a, REG>;
+#[doc = "Field `DEMAP_FORCE_PU` reader - Force Power Up for Demapper"]
+pub type DEMAP_FORCE_PU_R = crate::BitReader;
+#[doc = "Field `DEMAP_FORCE_PU` writer - Force Power Up for Demapper"]
+pub type DEMAP_FORCE_PU_W<'a, REG> = crate::BitWriter<'a, REG>;
+#[doc = "Field `VIT_FORCE_PD` reader - Force Power Down for Viterbi Decoder"]
+pub type VIT_FORCE_PD_R = crate::BitReader;
+#[doc = "Field `VIT_FORCE_PD` writer - Force Power Down for Viterbi Decoder"]
+pub type VIT_FORCE_PD_W<'a, REG> = crate::BitWriter<'a, REG>;
+#[doc = "Field `VIT_FORCE_PU` reader - Force Power Up for Viterbi Decoder"]
+pub type VIT_FORCE_PU_R = crate::BitReader;
+#[doc = "Field `VIT_FORCE_PU` writer - Force Power Up for Viterbi Decoder"]
+pub type VIT_FORCE_PU_W<'a, REG> = crate::BitWriter<'a, REG>;
+#[doc = "Field `RX_ROT_FORCE_PD` reader - Force Power Down for RX Rotation"]
+pub type RX_ROT_FORCE_PD_R = crate::BitReader;
+#[doc = "Field `RX_ROT_FORCE_PD` writer - Force Power Down for RX Rotation"]
+pub type RX_ROT_FORCE_PD_W<'a, REG> = crate::BitWriter<'a, REG>;
+#[doc = "Field `RX_ROT_FORCE_PU` reader - Force Power Up for RX Rotation"]
+pub type RX_ROT_FORCE_PU_R = crate::BitReader;
+#[doc = "Field `RX_ROT_FORCE_PU` writer - Force Power Up for RX Rotation"]
+pub type RX_ROT_FORCE_PU_W<'a, REG> = crate::BitWriter<'a, REG>;
+#[doc = "Field `CHAN_EST_FORCE_PD` reader - Force Power Down for Channel Estimation"]
+pub type CHAN_EST_FORCE_PD_R = crate::BitReader;
+#[doc = "Field `CHAN_EST_FORCE_PD` writer - Force Power Down for Channel Estimation"]
+pub type CHAN_EST_FORCE_PD_W<'a, REG> = crate::BitWriter<'a, REG>;
+#[doc = "Field `CHAN_EST_FORCE_PU` reader - Force Power Up for Channel Estimation"]
+pub type CHAN_EST_FORCE_PU_R = crate::BitReader;
+#[doc = "Field `CHAN_EST_FORCE_PU` writer - Force Power Up for Channel Estimation"]
+pub type CHAN_EST_FORCE_PU_W<'a, REG> = crate::BitWriter<'a, REG>;
+impl R {
+    #[doc = "Bit 0 - Force Power Down for Demapper"]
+    #[inline(always)]
+    pub fn demap_force_pd(&self) -> DEMAP_FORCE_PD_R {
+        DEMAP_FORCE_PD_R::new((self.bits & 1) != 0)
+    }
+    #[doc = "Bit 1 - Force Power Up for Demapper"]
+    #[inline(always)]
+    pub fn demap_force_pu(&self) -> DEMAP_FORCE_PU_R {
+        DEMAP_FORCE_PU_R::new(((self.bits >> 1) & 1) != 0)
+    }
+    #[doc = "Bit 2 - Force Power Down for Viterbi Decoder"]
+    #[inline(always)]
+    pub fn vit_force_pd(&self) -> VIT_FORCE_PD_R {
+        VIT_FORCE_PD_R::new(((self.bits >> 2) & 1) != 0)
+    }
+    #[doc = "Bit 3 - Force Power Up for Viterbi Decoder"]
+    #[inline(always)]
+    pub fn vit_force_pu(&self) -> VIT_FORCE_PU_R {
+        VIT_FORCE_PU_R::new(((self.bits >> 3) & 1) != 0)
+    }
+    #[doc = "Bit 4 - Force Power Down for RX Rotation"]
+    #[inline(always)]
+    pub fn rx_rot_force_pd(&self) -> RX_ROT_FORCE_PD_R {
+        RX_ROT_FORCE_PD_R::new(((self.bits >> 4) & 1) != 0)
+    }
+    #[doc = "Bit 5 - Force Power Up for RX Rotation"]
+    #[inline(always)]
+    pub fn rx_rot_force_pu(&self) -> RX_ROT_FORCE_PU_R {
+        RX_ROT_FORCE_PU_R::new(((self.bits >> 5) & 1) != 0)
+    }
+    #[doc = "Bit 6 - Force Power Down for Channel Estimation"]
+    #[inline(always)]
+    pub fn chan_est_force_pd(&self) -> CHAN_EST_FORCE_PD_R {
+        CHAN_EST_FORCE_PD_R::new(((self.bits >> 6) & 1) != 0)
+    }
+    #[doc = "Bit 7 - Force Power Up for Channel Estimation"]
+    #[inline(always)]
+    pub fn chan_est_force_pu(&self) -> CHAN_EST_FORCE_PU_R {
+        CHAN_EST_FORCE_PU_R::new(((self.bits >> 7) & 1) != 0)
+    }
+}
+#[cfg(feature = "impl-register-debug")]
+impl core::fmt::Debug for R {
+    fn fmt(&self, f: &mut core::fmt::Formatter) -> core::fmt::Result {
+        f.debug_struct("NRXPD_CTRL")
+            .field("chan_est_force_pu", &self.chan_est_force_pu())
+            .field("chan_est_force_pd", &self.chan_est_force_pd())
+            .field("rx_rot_force_pu", &self.rx_rot_force_pu())
+            .field("rx_rot_force_pd", &self.rx_rot_force_pd())
+            .field("vit_force_pu", &self.vit_force_pu())
+            .field("vit_force_pd", &self.vit_force_pd())
+            .field("demap_force_pu", &self.demap_force_pu())
+            .field("demap_force_pd", &self.demap_force_pd())
+            .finish()
+    }
+}
+impl W {
+    #[doc = "Bit 0 - Force Power Down for Demapper"]
+    #[inline(always)]
+    pub fn demap_force_pd(&mut self) -> DEMAP_FORCE_PD_W<NRXPD_CTRL_SPEC> {
+        DEMAP_FORCE_PD_W::new(self, 0)
+    }
+    #[doc = "Bit 1 - Force Power Up for Demapper"]
+    #[inline(always)]
+    pub fn demap_force_pu(&mut self) -> DEMAP_FORCE_PU_W<NRXPD_CTRL_SPEC> {
+        DEMAP_FORCE_PU_W::new(self, 1)
+    }
+    #[doc = "Bit 2 - Force Power Down for Viterbi Decoder"]
+    #[inline(always)]
+    pub fn vit_force_pd(&mut self) -> VIT_FORCE_PD_W<NRXPD_CTRL_SPEC> {
+        VIT_FORCE_PD_W::new(self, 2)
+    }
+    #[doc = "Bit 3 - Force Power Up for Viterbi Decoder"]
+    #[inline(always)]
+    pub fn vit_force_pu(&mut self) -> VIT_FORCE_PU_W<NRXPD_CTRL_SPEC> {
+        VIT_FORCE_PU_W::new(self, 3)
+    }
+    #[doc = "Bit 4 - Force Power Down for RX Rotation"]
+    #[inline(always)]
+    pub fn rx_rot_force_pd(&mut self) -> RX_ROT_FORCE_PD_W<NRXPD_CTRL_SPEC> {
+        RX_ROT_FORCE_PD_W::new(self, 4)
+    }
+    #[doc = "Bit 5 - Force Power Up for RX Rotation"]
+    #[inline(always)]
+    pub fn rx_rot_force_pu(&mut self) -> RX_ROT_FORCE_PU_W<NRXPD_CTRL_SPEC> {
+        RX_ROT_FORCE_PU_W::new(self, 5)
+    }
+    #[doc = "Bit 6 - Force Power Down for Channel Estimation"]
+    #[inline(always)]
+    pub fn chan_est_force_pd(&mut self) -> CHAN_EST_FORCE_PD_W<NRXPD_CTRL_SPEC> {
+        CHAN_EST_FORCE_PD_W::new(self, 6)
+    }
+    #[doc = "Bit 7 - Force Power Up for Channel Estimation"]
+    #[inline(always)]
+    pub fn chan_est_force_pu(&mut self) -> CHAN_EST_FORCE_PU_W<NRXPD_CTRL_SPEC> {
+        CHAN_EST_FORCE_PU_W::new(self, 7)
+    }
+}
+#[doc = "NRX Power Down Control Register\n\nYou can [`read`](crate::Reg::read) this register and get [`nrxpd_ctrl::R`](R). You can [`reset`](crate::Reg::reset), [`write`](crate::Reg::write), [`write_with_zero`](crate::Reg::write_with_zero) this register using [`nrxpd_ctrl::W`](W). You can also [`modify`](crate::Reg::modify) this register. See [API](https://docs.rs/svd2rust/#read--modify--write-api)."]
+pub struct NRXPD_CTRL_SPEC;
+impl crate::RegisterSpec for NRXPD_CTRL_SPEC {
+    type Ux = u8;
+}
+#[doc = "`read()` method returns [`nrxpd_ctrl::R`](R) reader structure"]
+impl crate::Readable for NRXPD_CTRL_SPEC {}
+#[doc = "`write(|w| ..)` method takes [`nrxpd_ctrl::W`](W) writer structure"]
+impl crate::Writable for NRXPD_CTRL_SPEC {
+    type Safety = crate::Unsafe;
+    const ZERO_TO_MODIFY_FIELDS_BITMAP: u8 = 0;
+    const ONE_TO_MODIFY_FIELDS_BITMAP: u8 = 0;
+}
+#[doc = "`reset()` method sets NRXPD_CTRL to value 0"]
+impl crate::Resettable for NRXPD_CTRL_SPEC {
+    const RESET_VALUE: u8 = 0;
+}