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/nrf5340-app-pac/src/qspi_ns/read/cnt.rs

@@ -0,0 +1,80 @@
+#[doc = "Register `CNT` reader"]
+pub struct R(crate::R<CNT_SPEC>);
+impl core::ops::Deref for R {
+    type Target = crate::R<CNT_SPEC>;
+    #[inline(always)]
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+impl From<crate::R<CNT_SPEC>> for R {
+    #[inline(always)]
+    fn from(reader: crate::R<CNT_SPEC>) -> Self {
+        R(reader)
+    }
+}
+#[doc = "Register `CNT` writer"]
+pub struct W(crate::W<CNT_SPEC>);
+impl core::ops::Deref for W {
+    type Target = crate::W<CNT_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<CNT_SPEC>> for W {
+    #[inline(always)]
+    fn from(writer: crate::W<CNT_SPEC>) -> Self {
+        W(writer)
+    }
+}
+#[doc = "Field `CNT` reader - Read transfer length in number of bytes. The length must be a multiple of 4 bytes."]
+pub type CNT_R = crate::FieldReader<u32, u32>;
+#[doc = "Field `CNT` writer - Read transfer length in number of bytes. The length must be a multiple of 4 bytes."]
+pub type CNT_W<'a, const O: u8> = crate::FieldWriter<'a, u32, CNT_SPEC, u32, u32, 21, O>;
+impl R {
+    #[doc = "Bits 0:20 - Read transfer length in number of bytes. The length must be a multiple of 4 bytes."]
+    #[inline(always)]
+    pub fn cnt(&self) -> CNT_R {
+        CNT_R::new((self.bits & 0x001f_ffff) as u32)
+    }
+}
+impl W {
+    #[doc = "Bits 0:20 - Read transfer length in number of bytes. The length must be a multiple of 4 bytes."]
+    #[inline(always)]
+    pub fn cnt(&mut self) -> CNT_W<0> {
+        CNT_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 = "Read transfer length\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 [cnt](index.html) module"]
+pub struct CNT_SPEC;
+impl crate::RegisterSpec for CNT_SPEC {
+    type Ux = u32;
+}
+#[doc = "`read()` method returns [cnt::R](R) reader structure"]
+impl crate::Readable for CNT_SPEC {
+    type Reader = R;
+}
+#[doc = "`write(|w| ..)` method takes [cnt::W](W) writer structure"]
+impl crate::Writable for CNT_SPEC {
+    type Writer = W;
+}
+#[doc = "`reset()` method sets CNT to value 0"]
+impl crate::Resettable for CNT_SPEC {
+    #[inline(always)]
+    fn reset_value() -> Self::Ux {
+        0
+    }
+}

vendor/nrf5340-app-pac/src/qspi_ns/read/dst.rs

@@ -0,0 +1,80 @@
+#[doc = "Register `DST` reader"]
+pub struct R(crate::R<DST_SPEC>);
+impl core::ops::Deref for R {
+    type Target = crate::R<DST_SPEC>;
+    #[inline(always)]
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+impl From<crate::R<DST_SPEC>> for R {
+    #[inline(always)]
+    fn from(reader: crate::R<DST_SPEC>) -> Self {
+        R(reader)
+    }
+}
+#[doc = "Register `DST` writer"]
+pub struct W(crate::W<DST_SPEC>);
+impl core::ops::Deref for W {
+    type Target = crate::W<DST_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<DST_SPEC>> for W {
+    #[inline(always)]
+    fn from(writer: crate::W<DST_SPEC>) -> Self {
+        W(writer)
+    }
+}
+#[doc = "Field `DST` reader - Word-aligned RAM destination address."]
+pub type DST_R = crate::FieldReader<u32, u32>;
+#[doc = "Field `DST` writer - Word-aligned RAM destination address."]
+pub type DST_W<'a, const O: u8> = crate::FieldWriter<'a, u32, DST_SPEC, u32, u32, 32, O>;
+impl R {
+    #[doc = "Bits 0:31 - Word-aligned RAM destination address."]
+    #[inline(always)]
+    pub fn dst(&self) -> DST_R {
+        DST_R::new(self.bits)
+    }
+}
+impl W {
+    #[doc = "Bits 0:31 - Word-aligned RAM destination address."]
+    #[inline(always)]
+    pub fn dst(&mut self) -> DST_W<0> {
+        DST_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 = "RAM destination address\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 [dst](index.html) module"]
+pub struct DST_SPEC;
+impl crate::RegisterSpec for DST_SPEC {
+    type Ux = u32;
+}
+#[doc = "`read()` method returns [dst::R](R) reader structure"]
+impl crate::Readable for DST_SPEC {
+    type Reader = R;
+}
+#[doc = "`write(|w| ..)` method takes [dst::W](W) writer structure"]
+impl crate::Writable for DST_SPEC {
+    type Writer = W;
+}
+#[doc = "`reset()` method sets DST to value 0"]
+impl crate::Resettable for DST_SPEC {
+    #[inline(always)]
+    fn reset_value() -> Self::Ux {
+        0
+    }
+}

vendor/nrf5340-app-pac/src/qspi_ns/read/src.rs

@@ -0,0 +1,80 @@
+#[doc = "Register `SRC` reader"]
+pub struct R(crate::R<SRC_SPEC>);
+impl core::ops::Deref for R {
+    type Target = crate::R<SRC_SPEC>;
+    #[inline(always)]
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+impl From<crate::R<SRC_SPEC>> for R {
+    #[inline(always)]
+    fn from(reader: crate::R<SRC_SPEC>) -> Self {
+        R(reader)
+    }
+}
+#[doc = "Register `SRC` writer"]
+pub struct W(crate::W<SRC_SPEC>);
+impl core::ops::Deref for W {
+    type Target = crate::W<SRC_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<SRC_SPEC>> for W {
+    #[inline(always)]
+    fn from(writer: crate::W<SRC_SPEC>) -> Self {
+        W(writer)
+    }
+}
+#[doc = "Field `SRC` reader - Word-aligned flash memory source address."]
+pub type SRC_R = crate::FieldReader<u32, u32>;
+#[doc = "Field `SRC` writer - Word-aligned flash memory source address."]
+pub type SRC_W<'a, const O: u8> = crate::FieldWriter<'a, u32, SRC_SPEC, u32, u32, 32, O>;
+impl R {
+    #[doc = "Bits 0:31 - Word-aligned flash memory source address."]
+    #[inline(always)]
+    pub fn src(&self) -> SRC_R {
+        SRC_R::new(self.bits)
+    }
+}
+impl W {
+    #[doc = "Bits 0:31 - Word-aligned flash memory source address."]
+    #[inline(always)]
+    pub fn src(&mut self) -> SRC_W<0> {
+        SRC_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 = "Flash memory source address\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 [src](index.html) module"]
+pub struct SRC_SPEC;
+impl crate::RegisterSpec for SRC_SPEC {
+    type Ux = u32;
+}
+#[doc = "`read()` method returns [src::R](R) reader structure"]
+impl crate::Readable for SRC_SPEC {
+    type Reader = R;
+}
+#[doc = "`write(|w| ..)` method takes [src::W](W) writer structure"]
+impl crate::Writable for SRC_SPEC {
+    type Writer = W;
+}
+#[doc = "`reset()` method sets SRC to value 0"]
+impl crate::Resettable for SRC_SPEC {
+    #[inline(always)]
+    fn reset_value() -> Self::Ux {
+        0
+    }
+}