Add LED type detection, improve device card layout

- Detect LED chip type (WS2812B, SK6812, etc.) from WLED /json/cfg
- Show RGBW/RGB channel indicator with colored squares on device card
- Move version, display index, LED count to subtitle row under device name
- Add remove button as × icon in top-right corner of card
- Hide latency from card display (still visible in health dot tooltip)
- Fix display layout overflow on narrow viewports
- Add wled_rgbw and wled_led_type to ProcessingState API schema

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/wled_controller/static/style.css

@@ -173,6 +173,7 @@ section {
     border: 1px solid var(--border-color);
     border-radius: 8px;
     padding: 20px;
+    position: relative;
     transition: transform 0.2s, box-shadow 0.2s;
 }
 
@@ -180,24 +181,35 @@ section {
     box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
 }
 
+.card-remove-btn {
+    position: absolute;
+    top: 10px;
+    right: 10px;
+    background: none;
+    border: none;
+    color: #777;
+    font-size: 1rem;
+    width: 28px;
+    height: 28px;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    cursor: pointer;
+    border-radius: 4px;
+    transition: color 0.2s, background 0.2s;
+}
+
+.card-remove-btn:hover {
+    color: var(--danger-color);
+    background: rgba(244, 67, 54, 0.1);
+}
+
 .card-header {
     display: flex;
     justify-content: space-between;
     align-items: center;
-    margin-bottom: 15px;
-}
-
-.card-header-badges {
-    display: flex;
-    align-items: center;
-    gap: 8px;
-}
-
-.display-badge,
-.led-count-badge {
-    font-size: 0.8rem;
-    color: var(--info-color);
-    opacity: 0.8;
+    margin-bottom: 4px;
+    padding-right: 30px;
 }
 
 .card-title {
@@ -206,16 +218,35 @@ section {
     display: flex;
     align-items: center;
     gap: 6px;
+    flex-wrap: wrap;
 }
 
-.wled-version {
-    font-size: 0.65rem;
-    font-weight: 400;
-    color: var(--text-secondary);
-    background: var(--border-color);
-    padding: 1px 6px;
-    border-radius: 8px;
-    letter-spacing: 0.03em;
+.card-subtitle {
+    display: flex;
+    align-items: center;
+    gap: 12px;
+    margin-bottom: 15px;
+    flex-wrap: wrap;
+}
+
+.card-meta {
+    font-size: 0.8rem;
+    color: #999;
+    display: inline-flex;
+    align-items: center;
+    gap: 4px;
+}
+
+.channel-indicator {
+    display: inline-flex;
+    gap: 2px;
+    align-items: center;
+}
+
+.channel-indicator .ch {
+    width: 8px;
+    height: 10px;
+    border-radius: 1px;
 }
 
 .badge {
@@ -363,10 +394,11 @@ section {
     border: 2px dashed var(--border-color);
     border-radius: 8px;
     padding: 30px;
-    min-height: 300px;
+    min-height: 280px;
     display: flex;
     align-items: center;
     justify-content: center;
+    overflow: hidden;
 }
 
 .layout-container {