chore(client): document MUI default fallbacks in getResponseColor

Annotate the hex literals used when callers omit theme colours so the intent (defensive MUI default match) is obvious instead of looking like arbitrary values.

client/src/Utils/DataUtils.ts

@@ -56,10 +56,12 @@ export const getResponseColor = (
 	// 0–300ms: interpolate start (good) -> mid (warning)
 	// 300–600ms: interpolate mid (warning) -> end (error)
 	// >600ms: solid end (error)
+	// MUI default success/warning/error.main values, used only when the caller
+	// fails to pass theme colors (defensive — keeps the gradient meaningful).
 	const safe = { ...colors };
-	if (!safe.start) safe.start = "#4caf50"; // fallback green
-	if (!safe.mid) safe.mid = "#ff9800"; // fallback orange
-	if (!safe.end) safe.end = "#f44336"; // fallback red
+	if (!safe.start) safe.start = "#4caf50";
+	if (!safe.mid) safe.mid = "#ff9800";
+	if (!safe.end) safe.end = "#f44336";
 
 	const toHex = (c: number) => c.toString(16).padStart(2, "0");
 	const clamp = (n: number) => Math.min(255, Math.max(0, Math.round(n)));