Optimize realtime charts for tablet

src/lib/components/SignalChart.svelte

@@ -182,8 +182,7 @@
     transition:
       opacity var(--fade-ms) cubic-bezier(0.18, 0.88, 0.3, 1),
       transform var(--enter-ms) cubic-bezier(0.2, 0.9, 0.28, 1),
-      border-color 460ms ease,
-      filter 760ms ease;
+      border-color 460ms ease;
     transition-delay: calc(var(--panel-index) * 140ms);
   }
 
@@ -300,8 +299,6 @@
     stroke-width: 1.3;
     stroke-linecap: round;
     stroke-linejoin: round;
-    filter: drop-shadow(0 0 2px rgb(0 0 0 / 0.42));
-    will-change: d;
   }
 
   .series-line.tone-cyan {
@@ -460,10 +457,6 @@
       box-shadow: inset 0 0 0 1px rgb(var(--hud-border-strong-rgb) / 0.08), 0 0 8px rgb(var(--hud-glow-rgb) / 0.1);
     }
 
-    .series-line {
-      filter: none;
-    }
-
     .scan-haze {
       display: none;
     }