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/nrf52811-pac/src/aar/intenclr.rs

@@ -0,0 +1,268 @@
+#[doc = "Register `INTENCLR` reader"]
+pub struct R(crate::R<INTENCLR_SPEC>);
+impl core::ops::Deref for R {
+    type Target = crate::R<INTENCLR_SPEC>;
+    #[inline(always)]
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+impl From<crate::R<INTENCLR_SPEC>> for R {
+    #[inline(always)]
+    fn from(reader: crate::R<INTENCLR_SPEC>) -> Self {
+        R(reader)
+    }
+}
+#[doc = "Register `INTENCLR` writer"]
+pub struct W(crate::W<INTENCLR_SPEC>);
+impl core::ops::Deref for W {
+    type Target = crate::W<INTENCLR_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<INTENCLR_SPEC>> for W {
+    #[inline(always)]
+    fn from(writer: crate::W<INTENCLR_SPEC>) -> Self {
+        W(writer)
+    }
+}
+#[doc = "Field `END` reader - Write '1' to disable interrupt for event END"]
+pub type END_R = crate::BitReader<END_A>;
+#[doc = "Write '1' to disable interrupt for event END\n\nValue on reset: 0"]
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub enum END_A {
+    #[doc = "0: Read: Disabled"]
+    DISABLED = 0,
+    #[doc = "1: Read: Enabled"]
+    ENABLED = 1,
+}
+impl From<END_A> for bool {
+    #[inline(always)]
+    fn from(variant: END_A) -> Self {
+        variant as u8 != 0
+    }
+}
+impl END_R {
+    #[doc = "Get enumerated values variant"]
+    #[inline(always)]
+    pub fn variant(&self) -> END_A {
+        match self.bits {
+            false => END_A::DISABLED,
+            true => END_A::ENABLED,
+        }
+    }
+    #[doc = "Checks if the value of the field is `DISABLED`"]
+    #[inline(always)]
+    pub fn is_disabled(&self) -> bool {
+        *self == END_A::DISABLED
+    }
+    #[doc = "Checks if the value of the field is `ENABLED`"]
+    #[inline(always)]
+    pub fn is_enabled(&self) -> bool {
+        *self == END_A::ENABLED
+    }
+}
+#[doc = "Write '1' to disable interrupt for event END\n\nValue on reset: 0"]
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub enum END_AW {
+    #[doc = "1: Disable"]
+    CLEAR = 1,
+}
+impl From<END_AW> for bool {
+    #[inline(always)]
+    fn from(variant: END_AW) -> Self {
+        variant as u8 != 0
+    }
+}
+#[doc = "Field `END` writer - Write '1' to disable interrupt for event END"]
+pub type END_W<'a, const O: u8> = crate::BitWriter<'a, u32, INTENCLR_SPEC, END_AW, O>;
+impl<'a, const O: u8> END_W<'a, O> {
+    #[doc = "Disable"]
+    #[inline(always)]
+    pub fn clear(self) -> &'a mut W {
+        self.variant(END_AW::CLEAR)
+    }
+}
+#[doc = "Field `RESOLVED` reader - Write '1' to disable interrupt for event RESOLVED"]
+pub type RESOLVED_R = crate::BitReader<RESOLVED_A>;
+#[doc = "Write '1' to disable interrupt for event RESOLVED\n\nValue on reset: 0"]
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub enum RESOLVED_A {
+    #[doc = "0: Read: Disabled"]
+    DISABLED = 0,
+    #[doc = "1: Read: Enabled"]
+    ENABLED = 1,
+}
+impl From<RESOLVED_A> for bool {
+    #[inline(always)]
+    fn from(variant: RESOLVED_A) -> Self {
+        variant as u8 != 0
+    }
+}
+impl RESOLVED_R {
+    #[doc = "Get enumerated values variant"]
+    #[inline(always)]
+    pub fn variant(&self) -> RESOLVED_A {
+        match self.bits {
+            false => RESOLVED_A::DISABLED,
+            true => RESOLVED_A::ENABLED,
+        }
+    }
+    #[doc = "Checks if the value of the field is `DISABLED`"]
+    #[inline(always)]
+    pub fn is_disabled(&self) -> bool {
+        *self == RESOLVED_A::DISABLED
+    }
+    #[doc = "Checks if the value of the field is `ENABLED`"]
+    #[inline(always)]
+    pub fn is_enabled(&self) -> bool {
+        *self == RESOLVED_A::ENABLED
+    }
+}
+#[doc = "Write '1' to disable interrupt for event RESOLVED\n\nValue on reset: 0"]
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub enum RESOLVED_AW {
+    #[doc = "1: Disable"]
+    CLEAR = 1,
+}
+impl From<RESOLVED_AW> for bool {
+    #[inline(always)]
+    fn from(variant: RESOLVED_AW) -> Self {
+        variant as u8 != 0
+    }
+}
+#[doc = "Field `RESOLVED` writer - Write '1' to disable interrupt for event RESOLVED"]
+pub type RESOLVED_W<'a, const O: u8> = crate::BitWriter<'a, u32, INTENCLR_SPEC, RESOLVED_AW, O>;
+impl<'a, const O: u8> RESOLVED_W<'a, O> {
+    #[doc = "Disable"]
+    #[inline(always)]
+    pub fn clear(self) -> &'a mut W {
+        self.variant(RESOLVED_AW::CLEAR)
+    }
+}
+#[doc = "Field `NOTRESOLVED` reader - Write '1' to disable interrupt for event NOTRESOLVED"]
+pub type NOTRESOLVED_R = crate::BitReader<NOTRESOLVED_A>;
+#[doc = "Write '1' to disable interrupt for event NOTRESOLVED\n\nValue on reset: 0"]
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub enum NOTRESOLVED_A {
+    #[doc = "0: Read: Disabled"]
+    DISABLED = 0,
+    #[doc = "1: Read: Enabled"]
+    ENABLED = 1,
+}
+impl From<NOTRESOLVED_A> for bool {
+    #[inline(always)]
+    fn from(variant: NOTRESOLVED_A) -> Self {
+        variant as u8 != 0
+    }
+}
+impl NOTRESOLVED_R {
+    #[doc = "Get enumerated values variant"]
+    #[inline(always)]
+    pub fn variant(&self) -> NOTRESOLVED_A {
+        match self.bits {
+            false => NOTRESOLVED_A::DISABLED,
+            true => NOTRESOLVED_A::ENABLED,
+        }
+    }
+    #[doc = "Checks if the value of the field is `DISABLED`"]
+    #[inline(always)]
+    pub fn is_disabled(&self) -> bool {
+        *self == NOTRESOLVED_A::DISABLED
+    }
+    #[doc = "Checks if the value of the field is `ENABLED`"]
+    #[inline(always)]
+    pub fn is_enabled(&self) -> bool {
+        *self == NOTRESOLVED_A::ENABLED
+    }
+}
+#[doc = "Write '1' to disable interrupt for event NOTRESOLVED\n\nValue on reset: 0"]
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub enum NOTRESOLVED_AW {
+    #[doc = "1: Disable"]
+    CLEAR = 1,
+}
+impl From<NOTRESOLVED_AW> for bool {
+    #[inline(always)]
+    fn from(variant: NOTRESOLVED_AW) -> Self {
+        variant as u8 != 0
+    }
+}
+#[doc = "Field `NOTRESOLVED` writer - Write '1' to disable interrupt for event NOTRESOLVED"]
+pub type NOTRESOLVED_W<'a, const O: u8> =
+    crate::BitWriter<'a, u32, INTENCLR_SPEC, NOTRESOLVED_AW, O>;
+impl<'a, const O: u8> NOTRESOLVED_W<'a, O> {
+    #[doc = "Disable"]
+    #[inline(always)]
+    pub fn clear(self) -> &'a mut W {
+        self.variant(NOTRESOLVED_AW::CLEAR)
+    }
+}
+impl R {
+    #[doc = "Bit 0 - Write '1' to disable interrupt for event END"]
+    #[inline(always)]
+    pub fn end(&self) -> END_R {
+        END_R::new((self.bits & 1) != 0)
+    }
+    #[doc = "Bit 1 - Write '1' to disable interrupt for event RESOLVED"]
+    #[inline(always)]
+    pub fn resolved(&self) -> RESOLVED_R {
+        RESOLVED_R::new(((self.bits >> 1) & 1) != 0)
+    }
+    #[doc = "Bit 2 - Write '1' to disable interrupt for event NOTRESOLVED"]
+    #[inline(always)]
+    pub fn notresolved(&self) -> NOTRESOLVED_R {
+        NOTRESOLVED_R::new(((self.bits >> 2) & 1) != 0)
+    }
+}
+impl W {
+    #[doc = "Bit 0 - Write '1' to disable interrupt for event END"]
+    #[inline(always)]
+    pub fn end(&mut self) -> END_W<0> {
+        END_W::new(self)
+    }
+    #[doc = "Bit 1 - Write '1' to disable interrupt for event RESOLVED"]
+    #[inline(always)]
+    pub fn resolved(&mut self) -> RESOLVED_W<1> {
+        RESOLVED_W::new(self)
+    }
+    #[doc = "Bit 2 - Write '1' to disable interrupt for event NOTRESOLVED"]
+    #[inline(always)]
+    pub fn notresolved(&mut self) -> NOTRESOLVED_W<2> {
+        NOTRESOLVED_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 interrupt\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 [intenclr](index.html) module"]
+pub struct INTENCLR_SPEC;
+impl crate::RegisterSpec for INTENCLR_SPEC {
+    type Ux = u32;
+}
+#[doc = "`read()` method returns [intenclr::R](R) reader structure"]
+impl crate::Readable for INTENCLR_SPEC {
+    type Reader = R;
+}
+#[doc = "`write(|w| ..)` method takes [intenclr::W](W) writer structure"]
+impl crate::Writable for INTENCLR_SPEC {
+    type Writer = W;
+}
+#[doc = "`reset()` method sets INTENCLR to value 0"]
+impl crate::Resettable for INTENCLR_SPEC {
+    #[inline(always)]
+    fn reset_value() -> Self::Ux {
+        0
+    }
+}