Slow status-dot blink to a softer ~1s breathe.

Co-authored-by: Cursor <cursoragent@cursor.com>

control/frontend/src/styles.css

@@ -363,9 +363,9 @@ input {
   box-shadow: 0 0 6px rgba(120, 140, 160, 0.35);
 }
 
-/* 似闪非闪：短周期 + 交错相位 */
+/* 柔和呼吸闪：约 1s，交错相位，避免晃眼 */
 .dot.pulse {
-  animation: status-flicker 0.28s steps(2, end) infinite;
+  animation: status-breathe 1.05s ease-in-out infinite;
 }
 
 .dot.pulse.d1 {
@@ -373,33 +373,24 @@ input {
 }
 
 .dot.pulse.d2 {
-  animation-delay: 0.09s;
-  animation-duration: 0.22s;
+  animation-delay: 0.2s;
 }
 
 .dot.pulse.d3 {
-  animation-delay: 0.05s;
-  animation-duration: 0.18s;
+  animation-delay: 0.4s;
 }
 
-@keyframes status-flicker {
+@keyframes status-breathe {
   0%,
   100% {
     opacity: 1;
-    filter: brightness(1.35);
-    transform: scale(1.05);
+    filter: brightness(1.1);
+    transform: scale(1);
   }
-  40% {
-    opacity: 0.15;
-    filter: brightness(0.7);
-    transform: scale(0.92);
-  }
-  55% {
-    opacity: 1;
-    filter: brightness(1.5);
-  }
-  70% {
-    opacity: 0.35;
+  50% {
+    opacity: 0.45;
+    filter: brightness(0.9);
+    transform: scale(0.94);
   }
 }