Feat: better user feedback on patterns page

src/state/ui.rs

@@ -86,6 +86,7 @@ pub struct UiState {
     pub demo_index: usize,
     pub nav_indicator_until: Option<Instant>,
     pub nav_fx: RefCell<Option<Effect>>,
+    pub pulse_phase: f32,
     pub last_click: Option<(Instant, u16, u16)>,
 }
 
@@ -142,6 +143,7 @@ impl Default for UiState {
             demo_index: 0,
             nav_indicator_until: None,
             nav_fx: RefCell::new(None),
+            pulse_phase: 0.0,
             last_click: None,
         }
     }