feat(core): use LED effect for BLE pairing

diff --git a/core/.changelog.d/6076.added b/core/.changelog.d/6076.added
new file mode 100644
index 00000000..29e9ae74
--- /dev/null
+++ b/core/.changelog.d/6076.added
@@ -0,0 +1 @@
+[T3W1] Use LED effect for BLE pairing.
diff --git a/core/embed/rust/src/trezorhal/rgb_led.rs b/core/embed/rust/src/trezorhal/rgb_led.rs
index 123ae4ce..369f7827 100644
--- a/core/embed/rust/src/trezorhal/rgb_led.rs
+++ b/core/embed/rust/src/trezorhal/rgb_led.rs
@@ -1,18 +1,38 @@
-#![allow(dead_code)]
-
-#[cfg(feature = "ui")]
-use crate::ui::display::Color;
-
 use super::ffi;
 
 pub fn set_color(color: u32) {
     unsafe {
+        // also stops ongoing LED effect (if previously started)
         ffi::rgb_led_set_color(color);
     }
 }
 
-/// Set LED color if provided, otherwise turn the LED off.
-#[cfg(feature = "ui")]
-pub fn set(color: Color) {
-    set_color(color.to_u32());
+#[derive(PartialEq, Eq, Clone, Copy)]
+pub enum Effect {
+    Pairing,
+    Charging,
+}
+
+impl Effect {
+    pub fn set(&self) {
+        if Some(self) == Self::current().as_ref() {
+            // don't stop ongoing LED effect (if previously started).
+            return;
+        }
+        let effect_type = match self {
+            Effect::Pairing => ffi::rgb_led_effect_type_t_RGB_LED_EFFECT_PAIRING,
+            Effect::Charging => ffi::rgb_led_effect_type_t_RGB_LED_EFFECT_CHARGING,
+        };
+        unsafe { ffi::rgb_led_effect_start(effect_type, 0) }
+    }
+
+    /// return current effect (if previously started).
+    fn current() -> Option<Self> {
+        let effect_type = unsafe { ffi::rgb_led_effect_get_type() };
+        Some(match effect_type {
+            ffi::rgb_led_effect_type_t_RGB_LED_EFFECT_PAIRING => Effect::Pairing,
+            ffi::rgb_led_effect_type_t_RGB_LED_EFFECT_CHARGING => Effect::Charging,
+            _ => return None,
+        })
+    }
 }
diff --git a/core/embed/rust/src/ui/component/ble.rs b/core/embed/rust/src/ui/component/ble.rs
index 7ba9ba37..814381d1 100644
--- a/core/embed/rust/src/ui/component/ble.rs
+++ b/core/embed/rust/src/ui/component/ble.rs
@@ -2,6 +2,7 @@ use crate::ui::{
     component::{Component, Event, EventCtx},
     event::BLEEvent,
     geometry::Rect,
+    led::{Effect, LedState},
     shape::Renderer,
 };
 
@@ -65,7 +66,9 @@ where
     }
 
     fn render<'s>(&'s self, target: &mut impl Renderer<'s>) {
-        self.inner.render(target)
+        self.inner.render(target);
+        #[cfg(feature = "rgb_led")]
+        target.set_led_state(LedState::Effect(Effect::Pairing));
     }
 }
 
diff --git a/core/embed/rust/src/ui/flow/swipe.rs b/core/embed/rust/src/ui/flow/swipe.rs
index d4547074..314eecc8 100644
--- a/core/embed/rust/src/ui/flow/swipe.rs
+++ b/core/embed/rust/src/ui/flow/swipe.rs
@@ -1,5 +1,3 @@
-#[cfg(feature = "rgb_led")]
-use crate::trezorhal::rgb_led;
 use crate::{
     error::{self, Error},
     maybe_trace::MaybeTrace,
@@ -317,7 +315,7 @@ impl Layout<Result<Obj, Error>> for SwipeFlow {
             self.current_page().render(target);
 
             #[cfg(feature = "rgb_led")]
-            rgb_led::set(target.led_color());
+            target.led_state().set();
 
             #[cfg(feature = "ui_debug")]
             if target.should_raise_overflow_exception() {
diff --git a/core/embed/rust/src/ui/layout/obj.rs b/core/embed/rust/src/ui/layout/obj.rs
index 9fafa599..cfc3f779 100644
--- a/core/embed/rust/src/ui/layout/obj.rs
+++ b/core/embed/rust/src/ui/layout/obj.rs
@@ -14,8 +14,6 @@ use num_traits::ToPrimitive;
 #[cfg(feature = "ble")]
 use crate::ui::event::BLEEvent;
 
-#[cfg(feature = "rgb_led")]
-use crate::trezorhal::rgb_led;
 #[cfg(feature = "button")]
 use crate::{
     trezorhal::button::{PhysicalButton, PhysicalButtonEvent},
@@ -161,7 +159,7 @@ where
             self.inner.render(target);
 
             #[cfg(feature = "rgb_led")]
-            rgb_led::set(target.led_color());
+            target.led_state().set();
 
             #[cfg(feature = "ui_debug")]
             if target.should_raise_overflow_exception() {
diff --git a/core/embed/rust/src/ui/layout_eckhart/component/error.rs b/core/embed/rust/src/ui/layout_eckhart/component/error.rs
index 072ad4f8..7f44ae02 100644
--- a/core/embed/rust/src/ui/layout_eckhart/component/error.rs
+++ b/core/embed/rust/src/ui/layout_eckhart/component/error.rs
@@ -1,3 +1,5 @@
+#[cfg(feature = "rgb_led")]
+use crate::ui::led::LedState;
 use crate::{
     strutil::TString,
     ui::{
@@ -85,6 +87,6 @@ impl<'a> Component for ErrorScreen<'a> {
         self.wait_for_restart.render(target);
         self.screen_border.render(u8::MAX, target);
         #[cfg(feature = "rgb_led")]
-        target.set_led_color(LED_RED);
+        target.set_led_state(LedState::Static(LED_RED));
     }
 }
diff --git a/core/embed/rust/src/ui/layout_eckhart/firmware/hold_to_confirm.rs b/core/embed/rust/src/ui/layout_eckhart/firmware/hold_to_confirm.rs
index 2997a9ea..b1f4a2bb 100644
--- a/core/embed/rust/src/ui/layout_eckhart/firmware/hold_to_confirm.rs
+++ b/core/embed/rust/src/ui/layout_eckhart/firmware/hold_to_confirm.rs
@@ -21,6 +21,9 @@ use pareen;
 #[cfg(feature = "haptic")]
 use crate::trezorhal::haptic;
 
+#[cfg(feature = "rgb_led")]
+use crate::ui::led::LedState;
+
 /// A component that displays a border that grows from the bottom of the screen
 /// to the top. The animation is parametrizable by color and duration.
 pub struct HoldToConfirmAnim {
@@ -213,7 +216,7 @@ impl Component for HoldToConfirmAnim {
             }
         }
         #[cfg(feature = "rgb_led")]
-        target.set_led_color(self.led_color);
+        target.set_led_state(LedState::Static(self.led_color));
     }
 }
 
diff --git a/core/embed/rust/src/ui/layout_eckhart/firmware/homescreen.rs b/core/embed/rust/src/ui/layout_eckhart/firmware/homescreen.rs
index c0eac0a0..7505b25c 100644
--- a/core/embed/rust/src/ui/layout_eckhart/firmware/homescreen.rs
+++ b/core/embed/rust/src/ui/layout_eckhart/firmware/homescreen.rs
@@ -23,6 +23,9 @@ use super::{
     ActionBar, ActionBarMsg, Hint,
 };
 
+#[cfg(feature = "rgb_led")]
+use crate::ui::led::LedState;
+
 /// Full-screen component for the homescreen and lockscreen.
 pub struct Homescreen {
     /// Device name with shadow
@@ -209,7 +212,9 @@ impl Component for Homescreen {
         }
 
         #[cfg(feature = "rgb_led")]
-        target.set_led_color(self.led_color.unwrap_or_else(Color::black));
+        target.set_led_state(LedState::Static(
+            self.led_color.unwrap_or_else(Color::black),
+        ));
     }
 }
 
diff --git a/core/embed/rust/src/ui/layout_eckhart/firmware/tutorial_screen.rs b/core/embed/rust/src/ui/layout_eckhart/firmware/tutorial_screen.rs
index 10c0a5a6..16544d47 100644
--- a/core/embed/rust/src/ui/layout_eckhart/firmware/tutorial_screen.rs
+++ b/core/embed/rust/src/ui/layout_eckhart/firmware/tutorial_screen.rs
@@ -21,6 +21,9 @@ use super::{
     ActionBar, ActionBarMsg,
 };
 
+#[cfg(feature = "rgb_led")]
+use crate::ui::led::LedState;
+
 // Duration of the loader animation
 const LOADER_DURATION: Duration = Duration::from_secs(3);
 // Loader animation + gradient duration
@@ -108,7 +111,7 @@ impl Component for TutorialWelcomeScreen {
         #[cfg(feature = "rgb_led")]
         if !loader_running {
             ScreenBackground::new(Some(LED_COLOR), None).render(target);
-            target.set_led_color(LED_COLOR);
+            target.set_led_state(LedState::Static(LED_COLOR));
         }
 
         self.text.render(target);
diff --git a/core/embed/rust/src/ui/led.rs b/core/embed/rust/src/ui/led.rs
new file mode 100644
index 00000000..c9372eb9
--- /dev/null
+++ b/core/embed/rust/src/ui/led.rs
@@ -0,0 +1,26 @@
+pub use crate::trezorhal::rgb_led::Effect;
+
+use crate::trezorhal::rgb_led::set_color;
+
+use super::display::Color;
+
+#[derive(PartialEq, Eq, Clone, Copy)]
+pub enum LedState {
+    Static(Color),
+    Effect(Effect),
+}
+
+impl Default for LedState {
+    fn default() -> Self {
+        LedState::Static(Color::black())
+    }
+}
+
+impl LedState {
+    pub fn set(&self) {
+        match self {
+            Self::Static(color) => set_color(color.to_u32()),
+            Self::Effect(effect) => effect.set(),
+        }
+    }
+}
diff --git a/core/embed/rust/src/ui/mod.rs b/core/embed/rust/src/ui/mod.rs
index 48e1f955..060985a4 100644
--- a/core/embed/rust/src/ui/mod.rs
+++ b/core/embed/rust/src/ui/mod.rs
@@ -17,6 +17,9 @@ pub mod layout;
 
 mod api;
 
+#[cfg(feature = "rgb_led")]
+mod led;
+
 #[cfg(feature = "layout_bolt")]
 pub mod layout_bolt;
 #[cfg(feature = "layout_caesar")]
diff --git a/core/embed/rust/src/ui/shape/render.rs b/core/embed/rust/src/ui/shape/render.rs
index 47b65500..a978cbbc 100644
--- a/core/embed/rust/src/ui/shape/render.rs
+++ b/core/embed/rust/src/ui/shape/render.rs
@@ -1,3 +1,5 @@
+#[cfg(feature = "rgb_led")]
+use crate::ui::led::LedState;
 use crate::ui::{
     display::Color,
     geometry::{Offset, Rect},
@@ -60,10 +62,10 @@ pub trait Renderer<'a> {
     }
 
     #[cfg(feature = "rgb_led")]
-    fn set_led_color(&mut self, color: Color);
+    fn set_led_state(&mut self, led: LedState);
 
     #[cfg(feature = "rgb_led")]
-    fn led_color(&self) -> Color;
+    fn led_state(&self) -> LedState;
 
     #[cfg(feature = "ui_debug")]
     fn raise_overflow_exception(&mut self);
@@ -87,7 +89,7 @@ where
     cache: &'a DrawingCache<'alloc>,
 
     #[cfg(feature = "rgb_led")]
-    led_color: Option<Color>,
+    led_state: Option<LedState>,
 
     #[cfg(feature = "ui_debug")]
     overflow: bool,
@@ -114,7 +116,7 @@ where
             canvas,
             cache,
             #[cfg(feature = "rgb_led")]
-            led_color: None,
+            led_state: None,
             #[cfg(feature = "ui_debug")]
             overflow: false,
         }
@@ -144,15 +146,15 @@ where
     }
 
     #[cfg(feature = "rgb_led")]
-    fn set_led_color(&mut self, color: Color) {
+    fn set_led_state(&mut self, led_state: LedState) {
         // LED color should be set once per rendered frame.
-        debug_assert!(self.led_color.is_none_or(|current| current == color));
-        self.led_color = Some(color);
+        debug_assert!(self.led_state.is_none_or(|current| current == led_state));
+        self.led_state = Some(led_state);
     }
 
     #[cfg(feature = "rgb_led")]
-    fn led_color(&self) -> Color {
-        self.led_color.unwrap_or_else(Color::black)
+    fn led_state(&self) -> LedState {
+        self.led_state.unwrap_or_default()
     }
 
     #[cfg(feature = "ui_debug")]
@@ -213,13 +215,13 @@ where
     }
 
     #[cfg(feature = "rgb_led")]
-    fn set_led_color(&mut self, color: Color) {
-        self.renderer.set_led_color(color);
+    fn set_led_state(&mut self, led_state: LedState) {
+        self.renderer.set_led_state(led_state);
     }
 
     #[cfg(feature = "rgb_led")]
-    fn led_color(&self) -> Color {
-        self.renderer.led_color()
+    fn led_state(&self) -> LedState {
+        self.renderer.led_state()
     }
 
     #[cfg(feature = "ui_debug")]