fix: fixed race condition crashes in Chart and Stack widgets (#2944)

Ensure data mutations from background readers are dispatched to the main thread to prevent conflicts with drawing logic (which runs on main thread). This resolves SIGTRAP and SIGABRT crashes observed during extended runtime.

Kit/Widgets/BarChart.swift

@@ -223,6 +223,7 @@ public class BarChart: WidgetWrapper {
     }
     
     public func setValue(_ newValue: [[ColorValue]]) {
+        DispatchQueue.main.async(execute: {
             let tolerance: CGFloat = 0.01
             let isDifferent = self._value.count != newValue.count || zip(self._value, newValue).contains { row1, row2 in
                 row1.count != row2.count || zip(row1, row2).contains { val1, val2 in
@@ -232,18 +233,23 @@ public class BarChart: WidgetWrapper {
             guard isDifferent else { return }
             self._value = newValue
             self.redraw()
+        })
     }
     
     public func setPressure(_ newPressureLevel: RAMPressure) {
+        DispatchQueue.main.async(execute: {
             guard self._pressureLevel != newPressureLevel else { return }
             self._pressureLevel = newPressureLevel
             self.redraw()
+        })
     }
     
     public func setColorZones(_ newColorZones: colorZones) {
+        DispatchQueue.main.async(execute: {
             guard self._colorZones != newColorZones else { return }
             self._colorZones = newColorZones
             self.redraw()
+        })
     }
     
     // MARK: - Settings

Kit/Widgets/LineChart.swift

@@ -249,17 +249,17 @@ public class LineChart: WidgetWrapper {
     }
     
     public func setValue(_ newValue: Double) {
-        self._value = newValue
         DispatchQueue.main.async(execute: {
+            self._value = newValue
             self.chart.addValue(newValue)
             self.display()
         })
     }
     
     public func setPressure(_ newPressureLevel: RAMPressure) {
+        DispatchQueue.main.async(execute: {
             guard self._pressureLevel != newPressureLevel else { return }
             self._pressureLevel = newPressureLevel
-        DispatchQueue.main.async(execute: {
             self.display()
         })
     }

Kit/Widgets/NetworkChart.swift

@@ -263,10 +263,10 @@ public class NetworkChart: WidgetWrapper {
     }
     
     public func setValue(upload: Double, download: Double) {
+        DispatchQueue.main.async(execute: {
             self.points.remove(at: 0)
             self.points.append((upload, download))
             
-        DispatchQueue.main.async(execute: {
             if self.window?.isVisible ?? false {
                 self.display()
             }

Kit/Widgets/Stack.swift

@@ -226,6 +226,7 @@ public class StackWidget: WidgetWrapper {
     }
     
     public func setValues(_ values: [Stack_t]) {
+        DispatchQueue.main.async(execute: {
             var tableNeedsToBeUpdated: Bool = false
             
             values.forEach { (p: Stack_t) in
@@ -243,7 +244,6 @@ public class StackWidget: WidgetWrapper {
             }
             self.values = diff.sorted(by: { $0.index < $1.index })
             
-        DispatchQueue.main.async(execute: {
             if tableNeedsToBeUpdated {
                 self.orderTableView.update()
             }