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/nrf52832-pac/src/bprot/disableindebug.rs

@@ -0,0 +1,127 @@
+#[doc = "Register `DISABLEINDEBUG` reader"]
+pub struct R(crate::R<DISABLEINDEBUG_SPEC>);
+impl core::ops::Deref for R {
+    type Target = crate::R<DISABLEINDEBUG_SPEC>;
+    #[inline(always)]
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+impl From<crate::R<DISABLEINDEBUG_SPEC>> for R {
+    #[inline(always)]
+    fn from(reader: crate::R<DISABLEINDEBUG_SPEC>) -> Self {
+        R(reader)
+    }
+}
+#[doc = "Register `DISABLEINDEBUG` writer"]
+pub struct W(crate::W<DISABLEINDEBUG_SPEC>);
+impl core::ops::Deref for W {
+    type Target = crate::W<DISABLEINDEBUG_SPEC>;
+    #[inline(always)]
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+impl core::ops::DerefMut for W {
+    #[inline(always)]
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut self.0
+    }
+}
+impl From<crate::W<DISABLEINDEBUG_SPEC>> for W {
+    #[inline(always)]
+    fn from(writer: crate::W<DISABLEINDEBUG_SPEC>) -> Self {
+        W(writer)
+    }
+}
+#[doc = "Field `DISABLEINDEBUG` reader - Disable the protection mechanism for NVM regions while in debug interface mode. This register will only disable the protection mechanism if the device is in debug interface mode."]
+pub type DISABLEINDEBUG_R = crate::BitReader<DISABLEINDEBUG_A>;
+#[doc = "Disable the protection mechanism for NVM regions while in debug interface mode. This register will only disable the protection mechanism if the device is in debug interface mode.\n\nValue on reset: 1"]
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub enum DISABLEINDEBUG_A {
+    #[doc = "1: Disable in debug"]
+    DISABLED = 1,
+    #[doc = "0: Enable in debug"]
+    ENABLED = 0,
+}
+impl From<DISABLEINDEBUG_A> for bool {
+    #[inline(always)]
+    fn from(variant: DISABLEINDEBUG_A) -> Self {
+        variant as u8 != 0
+    }
+}
+impl DISABLEINDEBUG_R {
+    #[doc = "Get enumerated values variant"]
+    #[inline(always)]
+    pub fn variant(&self) -> DISABLEINDEBUG_A {
+        match self.bits {
+            true => DISABLEINDEBUG_A::DISABLED,
+            false => DISABLEINDEBUG_A::ENABLED,
+        }
+    }
+    #[doc = "Checks if the value of the field is `DISABLED`"]
+    #[inline(always)]
+    pub fn is_disabled(&self) -> bool {
+        *self == DISABLEINDEBUG_A::DISABLED
+    }
+    #[doc = "Checks if the value of the field is `ENABLED`"]
+    #[inline(always)]
+    pub fn is_enabled(&self) -> bool {
+        *self == DISABLEINDEBUG_A::ENABLED
+    }
+}
+#[doc = "Field `DISABLEINDEBUG` writer - Disable the protection mechanism for NVM regions while in debug interface mode. This register will only disable the protection mechanism if the device is in debug interface mode."]
+pub type DISABLEINDEBUG_W<'a, const O: u8> =
+    crate::BitWriter<'a, u32, DISABLEINDEBUG_SPEC, DISABLEINDEBUG_A, O>;
+impl<'a, const O: u8> DISABLEINDEBUG_W<'a, O> {
+    #[doc = "Disable in debug"]
+    #[inline(always)]
+    pub fn disabled(self) -> &'a mut W {
+        self.variant(DISABLEINDEBUG_A::DISABLED)
+    }
+    #[doc = "Enable in debug"]
+    #[inline(always)]
+    pub fn enabled(self) -> &'a mut W {
+        self.variant(DISABLEINDEBUG_A::ENABLED)
+    }
+}
+impl R {
+    #[doc = "Bit 0 - Disable the protection mechanism for NVM regions while in debug interface mode. This register will only disable the protection mechanism if the device is in debug interface mode."]
+    #[inline(always)]
+    pub fn disableindebug(&self) -> DISABLEINDEBUG_R {
+        DISABLEINDEBUG_R::new((self.bits & 1) != 0)
+    }
+}
+impl W {
+    #[doc = "Bit 0 - Disable the protection mechanism for NVM regions while in debug interface mode. This register will only disable the protection mechanism if the device is in debug interface mode."]
+    #[inline(always)]
+    pub fn disableindebug(&mut self) -> DISABLEINDEBUG_W<0> {
+        DISABLEINDEBUG_W::new(self)
+    }
+    #[doc = "Writes raw bits to the register."]
+    #[inline(always)]
+    pub unsafe fn bits(&mut self, bits: u32) -> &mut Self {
+        self.0.bits(bits);
+        self
+    }
+}
+#[doc = "Disable protection mechanism in debug interface mode\n\nThis register you can [`read`](crate::generic::Reg::read), [`write_with_zero`](crate::generic::Reg::write_with_zero), [`reset`](crate::generic::Reg::reset), [`write`](crate::generic::Reg::write), [`modify`](crate::generic::Reg::modify). See [API](https://docs.rs/svd2rust/#read--modify--write-api).\n\nFor information about available fields see [disableindebug](index.html) module"]
+pub struct DISABLEINDEBUG_SPEC;
+impl crate::RegisterSpec for DISABLEINDEBUG_SPEC {
+    type Ux = u32;
+}
+#[doc = "`read()` method returns [disableindebug::R](R) reader structure"]
+impl crate::Readable for DISABLEINDEBUG_SPEC {
+    type Reader = R;
+}
+#[doc = "`write(|w| ..)` method takes [disableindebug::W](W) writer structure"]
+impl crate::Writable for DISABLEINDEBUG_SPEC {
+    type Writer = W;
+}
+#[doc = "`reset()` method sets DISABLEINDEBUG to value 0x01"]
+impl crate::Resettable for DISABLEINDEBUG_SPEC {
+    #[inline(always)]
+    fn reset_value() -> Self::Ux {
+        0x01
+    }
+}

vendor/nrf52832-pac/src/bprot/unused0.rs

@@ -0,0 +1,64 @@
+#[doc = "Register `UNUSED0` reader"]
+pub struct R(crate::R<UNUSED0_SPEC>);
+impl core::ops::Deref for R {
+    type Target = crate::R<UNUSED0_SPEC>;
+    #[inline(always)]
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+impl From<crate::R<UNUSED0_SPEC>> for R {
+    #[inline(always)]
+    fn from(reader: crate::R<UNUSED0_SPEC>) -> Self {
+        R(reader)
+    }
+}
+#[doc = "Register `UNUSED0` writer"]
+pub struct W(crate::W<UNUSED0_SPEC>);
+impl core::ops::Deref for W {
+    type Target = crate::W<UNUSED0_SPEC>;
+    #[inline(always)]
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+impl core::ops::DerefMut for W {
+    #[inline(always)]
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut self.0
+    }
+}
+impl From<crate::W<UNUSED0_SPEC>> for W {
+    #[inline(always)]
+    fn from(writer: crate::W<UNUSED0_SPEC>) -> Self {
+        W(writer)
+    }
+}
+impl W {
+    #[doc = "Writes raw bits to the register."]
+    #[inline(always)]
+    pub unsafe fn bits(&mut self, bits: u32) -> &mut Self {
+        self.0.bits(bits);
+        self
+    }
+}
+#[doc = "Unspecified\n\nThis register you can [`read`](crate::generic::Reg::read), [`write_with_zero`](crate::generic::Reg::write_with_zero), [`reset`](crate::generic::Reg::reset), [`write`](crate::generic::Reg::write), [`modify`](crate::generic::Reg::modify). See [API](https://docs.rs/svd2rust/#read--modify--write-api).\n\nFor information about available fields see [unused0](index.html) module"]
+pub struct UNUSED0_SPEC;
+impl crate::RegisterSpec for UNUSED0_SPEC {
+    type Ux = u32;
+}
+#[doc = "`read()` method returns [unused0::R](R) reader structure"]
+impl crate::Readable for UNUSED0_SPEC {
+    type Reader = R;
+}
+#[doc = "`write(|w| ..)` method takes [unused0::W](W) writer structure"]
+impl crate::Writable for UNUSED0_SPEC {
+    type Writer = W;
+}
+#[doc = "`reset()` method sets UNUSED0 to value 0"]
+impl crate::Resettable for UNUSED0_SPEC {
+    #[inline(always)]
+    fn reset_value() -> Self::Ux {
+        0
+    }
+}