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/nrf52805-pac/src/egu0/events_triggered.rs

@@ -0,0 +1,134 @@
+#[doc = "Register `EVENTS_TRIGGERED[%s]` reader"]
+pub struct R(crate::R<EVENTS_TRIGGERED_SPEC>);
+impl core::ops::Deref for R {
+    type Target = crate::R<EVENTS_TRIGGERED_SPEC>;
+    #[inline(always)]
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+impl From<crate::R<EVENTS_TRIGGERED_SPEC>> for R {
+    #[inline(always)]
+    fn from(reader: crate::R<EVENTS_TRIGGERED_SPEC>) -> Self {
+        R(reader)
+    }
+}
+#[doc = "Register `EVENTS_TRIGGERED[%s]` writer"]
+pub struct W(crate::W<EVENTS_TRIGGERED_SPEC>);
+impl core::ops::Deref for W {
+    type Target = crate::W<EVENTS_TRIGGERED_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<EVENTS_TRIGGERED_SPEC>> for W {
+    #[inline(always)]
+    fn from(writer: crate::W<EVENTS_TRIGGERED_SPEC>) -> Self {
+        W(writer)
+    }
+}
+#[doc = "Field `EVENTS_TRIGGERED` reader - Event number n generated by triggering the corresponding TRIGGER\\[n\\]
+task"]
+pub type EVENTS_TRIGGERED_R = crate::BitReader<EVENTS_TRIGGERED_A>;
+#[doc = "Event number n generated by triggering the corresponding TRIGGER\\[n\\]
+task\n\nValue on reset: 0"]
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub enum EVENTS_TRIGGERED_A {
+    #[doc = "0: Event not generated"]
+    NOT_GENERATED = 0,
+    #[doc = "1: Event generated"]
+    GENERATED = 1,
+}
+impl From<EVENTS_TRIGGERED_A> for bool {
+    #[inline(always)]
+    fn from(variant: EVENTS_TRIGGERED_A) -> Self {
+        variant as u8 != 0
+    }
+}
+impl EVENTS_TRIGGERED_R {
+    #[doc = "Get enumerated values variant"]
+    #[inline(always)]
+    pub fn variant(&self) -> EVENTS_TRIGGERED_A {
+        match self.bits {
+            false => EVENTS_TRIGGERED_A::NOT_GENERATED,
+            true => EVENTS_TRIGGERED_A::GENERATED,
+        }
+    }
+    #[doc = "Checks if the value of the field is `NOT_GENERATED`"]
+    #[inline(always)]
+    pub fn is_not_generated(&self) -> bool {
+        *self == EVENTS_TRIGGERED_A::NOT_GENERATED
+    }
+    #[doc = "Checks if the value of the field is `GENERATED`"]
+    #[inline(always)]
+    pub fn is_generated(&self) -> bool {
+        *self == EVENTS_TRIGGERED_A::GENERATED
+    }
+}
+#[doc = "Field `EVENTS_TRIGGERED` writer - Event number n generated by triggering the corresponding TRIGGER\\[n\\]
+task"]
+pub type EVENTS_TRIGGERED_W<'a, const O: u8> =
+    crate::BitWriter<'a, u32, EVENTS_TRIGGERED_SPEC, EVENTS_TRIGGERED_A, O>;
+impl<'a, const O: u8> EVENTS_TRIGGERED_W<'a, O> {
+    #[doc = "Event not generated"]
+    #[inline(always)]
+    pub fn not_generated(self) -> &'a mut W {
+        self.variant(EVENTS_TRIGGERED_A::NOT_GENERATED)
+    }
+    #[doc = "Event generated"]
+    #[inline(always)]
+    pub fn generated(self) -> &'a mut W {
+        self.variant(EVENTS_TRIGGERED_A::GENERATED)
+    }
+}
+impl R {
+    #[doc = "Bit 0 - Event number n generated by triggering the corresponding TRIGGER\\[n\\]
+task"]
+    #[inline(always)]
+    pub fn events_triggered(&self) -> EVENTS_TRIGGERED_R {
+        EVENTS_TRIGGERED_R::new((self.bits & 1) != 0)
+    }
+}
+impl W {
+    #[doc = "Bit 0 - Event number n generated by triggering the corresponding TRIGGER\\[n\\]
+task"]
+    #[inline(always)]
+    pub fn events_triggered(&mut self) -> EVENTS_TRIGGERED_W<0> {
+        EVENTS_TRIGGERED_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 = "Description collection: Event number n generated by triggering the corresponding TRIGGER\\[n\\]
+task\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 [events_triggered](index.html) module"]
+pub struct EVENTS_TRIGGERED_SPEC;
+impl crate::RegisterSpec for EVENTS_TRIGGERED_SPEC {
+    type Ux = u32;
+}
+#[doc = "`read()` method returns [events_triggered::R](R) reader structure"]
+impl crate::Readable for EVENTS_TRIGGERED_SPEC {
+    type Reader = R;
+}
+#[doc = "`write(|w| ..)` method takes [events_triggered::W](W) writer structure"]
+impl crate::Writable for EVENTS_TRIGGERED_SPEC {
+    type Writer = W;
+}
+#[doc = "`reset()` method sets EVENTS_TRIGGERED[%s]
+to value 0"]
+impl crate::Resettable for EVENTS_TRIGGERED_SPEC {
+    #[inline(always)]
+    fn reset_value() -> Self::Ux {
+        0
+    }
+}

vendor/nrf52805-pac/src/egu0/tasks_trigger.rs

@@ -0,0 +1,77 @@
+#[doc = "Register `TASKS_TRIGGER[%s]` writer"]
+pub struct W(crate::W<TASKS_TRIGGER_SPEC>);
+impl core::ops::Deref for W {
+    type Target = crate::W<TASKS_TRIGGER_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<TASKS_TRIGGER_SPEC>> for W {
+    #[inline(always)]
+    fn from(writer: crate::W<TASKS_TRIGGER_SPEC>) -> Self {
+        W(writer)
+    }
+}
+#[doc = "Trigger n for triggering the corresponding TRIGGERED\\[n\\]
+event\n\nValue on reset: 0"]
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub enum TASKS_TRIGGER_AW {
+    #[doc = "1: Trigger task"]
+    TRIGGER = 1,
+}
+impl From<TASKS_TRIGGER_AW> for bool {
+    #[inline(always)]
+    fn from(variant: TASKS_TRIGGER_AW) -> Self {
+        variant as u8 != 0
+    }
+}
+#[doc = "Field `TASKS_TRIGGER` writer - Trigger n for triggering the corresponding TRIGGERED\\[n\\]
+event"]
+pub type TASKS_TRIGGER_W<'a, const O: u8> =
+    crate::BitWriter<'a, u32, TASKS_TRIGGER_SPEC, TASKS_TRIGGER_AW, O>;
+impl<'a, const O: u8> TASKS_TRIGGER_W<'a, O> {
+    #[doc = "Trigger task"]
+    #[inline(always)]
+    pub fn trigger(self) -> &'a mut W {
+        self.variant(TASKS_TRIGGER_AW::TRIGGER)
+    }
+}
+impl W {
+    #[doc = "Bit 0 - Trigger n for triggering the corresponding TRIGGERED\\[n\\]
+event"]
+    #[inline(always)]
+    pub fn tasks_trigger(&mut self) -> TASKS_TRIGGER_W<0> {
+        TASKS_TRIGGER_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 = "Description collection: Trigger n for triggering the corresponding TRIGGERED\\[n\\]
+event\n\nThis register you can [`write_with_zero`](crate::generic::Reg::write_with_zero), [`reset`](crate::generic::Reg::reset), [`write`](crate::generic::Reg::write). See [API](https://docs.rs/svd2rust/#read--modify--write-api).\n\nFor information about available fields see [tasks_trigger](index.html) module"]
+pub struct TASKS_TRIGGER_SPEC;
+impl crate::RegisterSpec for TASKS_TRIGGER_SPEC {
+    type Ux = u32;
+}
+#[doc = "`write(|w| ..)` method takes [tasks_trigger::W](W) writer structure"]
+impl crate::Writable for TASKS_TRIGGER_SPEC {
+    type Writer = W;
+}
+#[doc = "`reset()` method sets TASKS_TRIGGER[%s]
+to value 0"]
+impl crate::Resettable for TASKS_TRIGGER_SPEC {
+    #[inline(always)]
+    fn reset_value() -> Self::Ux {
+        0
+    }
+}