fix(ui-dioxus): use atomic+thread for Blitz animation (Signal not Send)

ui-dioxus/src/components/pulsing_dot.rs

@@ -1,10 +1,13 @@
 /// PulsingDot — GPU-friendly animated status indicator.
 ///
-/// Uses Dioxus signals + async timer instead of CSS @keyframes.
-/// Blitz/wgpu doesn't optimize CSS animations (causes full-scene repaint every frame).
-/// Signal-based approach only repaints the dot element on state change (~2x per cycle).
+/// Uses Dioxus use_resource + channel pattern for Blitz-compatible animation.
+/// Blitz/wgpu doesn't optimize CSS animations (full-scene repaint every frame).
+/// This: OS thread does timing → atomic float → use_resource polls it.
 
 use dioxus::prelude::*;
+use std::sync::atomic::{AtomicU32, Ordering};
+use std::sync::Arc;
+use std::time::Duration;
 
 #[derive(Clone, PartialEq)]
 pub enum DotState {
@@ -18,25 +21,46 @@ pub enum DotState {
 #[component]
 pub fn PulsingDot(state: DotState, size: Option<String>) -> Element {
     let should_pulse = matches!(state, DotState::Running | DotState::Stalled);
-    let mut opacity = use_signal(|| 1.0f32);
 
-    // Spring-style pulse: smoothly interpolate opacity between 1.0 and 0.4
+    // Shared atomic for cross-thread opacity (f32 stored as u32 bits)
+    let atomic_opacity = use_hook(|| Arc::new(AtomicU32::new(f32::to_bits(1.0))));
+    let mut rendered_opacity = use_signal(|| 1.0f32);
+
     if should_pulse {
-        use_future(move || async move {
-            let mut going_down = true;
-            loop {
-                // 8 steps per half-cycle = smooth-ish animation at low repaint cost
-                for step in 0..8 {
-                    let t = step as f32 / 7.0;
-                    let val = if going_down {
-                        1.0 - (t * 0.6) // 1.0 → 0.4
-                    } else {
-                        0.4 + (t * 0.6) // 0.4 → 1.0
-                    };
-                    opacity.set(val);
-                    tokio::time::sleep(std::time::Duration::from_millis(125)).await;
+        let ao = atomic_opacity.clone();
+        // Spawn OS thread once to drive animation timing
+        use_hook(move || {
+            std::thread::spawn(move || {
+                let steps = 8u32;
+                let step_ms = 125u64;
+                let mut going_down = true;
+                loop {
+                    for i in 0..steps {
+                        let t = i as f32 / (steps - 1) as f32;
+                        let val = if going_down {
+                            1.0 - (t * 0.6)
+                        } else {
+                            0.4 + (t * 0.6)
+                        };
+                        ao.store(f32::to_bits(val), Ordering::Relaxed);
+                        std::thread::sleep(Duration::from_millis(step_ms));
+                    }
+                    going_down = !going_down;
+                }
+            });
+        });
+
+        // Poll the atomic value and update signal (runs in Dioxus runtime)
+        let ao2 = atomic_opacity.clone();
+        use_future(move || {
+            let ao3 = ao2.clone();
+            async move {
+                loop {
+                    let bits = ao3.load(Ordering::Relaxed);
+                    let val = f32::from_bits(bits);
+                    rendered_opacity.set(val);
+                    tokio::time::sleep(Duration::from_millis(60)).await;
                 }
-                going_down = !going_down;
             }
         });
     }
@@ -50,7 +74,7 @@ pub fn PulsingDot(state: DotState, size: Option<String>) -> Element {
     };
 
     let sz = size.unwrap_or_else(|| "8px".to_string());
-    let op = if should_pulse { *opacity.read() } else { 1.0 };
+    let op = if should_pulse { *rendered_opacity.read() } else { 1.0 };
 
     rsx! {
         span {