Add reusable icon-grid type selector for CSS source editor

Replaces the plain <select> dropdown with a visual grid popup showing
icon, label, and description for each source type. The IconSelect
component is generic and reusable for other type selectors.

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

server/src/wled_controller/static/css/components.css

@@ -462,6 +462,124 @@ textarea:focus-visible {
     padding: 6px 10px;
     border: 1px solid var(--border-color);
     border-radius: var(--radius);
-    background: var(--bg-primary);
+    background: var(--bg-secondary);
     font-size: 0.9rem;
 }
+
+/* ── Icon Select (reusable type picker) ──────────────────────── */
+
+.icon-select-trigger {
+    display: flex;
+    align-items: center;
+    gap: 8px;
+    width: 100%;
+    padding: 10px;
+    border: 1px solid var(--border-color);
+    border-radius: 4px;
+    background: var(--bg-color);
+    color: var(--text-color);
+    font-size: 1rem;
+    cursor: pointer;
+    transition: border-color 0.15s;
+    text-align: left;
+}
+.icon-select-trigger:hover {
+    border-color: var(--primary-color);
+}
+.icon-select-trigger-icon {
+    display: flex;
+    align-items: center;
+    flex-shrink: 0;
+}
+.icon-select-trigger-icon .icon {
+    width: 18px;
+    height: 18px;
+}
+.icon-select-trigger-label {
+    flex: 1;
+    min-width: 0;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    white-space: nowrap;
+}
+.icon-select-trigger-arrow {
+    flex-shrink: 0;
+    font-size: 0.8rem;
+    opacity: 0.5;
+    margin-left: auto;
+}
+
+.icon-select-popup {
+    position: relative;
+    max-height: 0;
+    overflow: hidden;
+    opacity: 0;
+    transition: max-height 0.2s ease, opacity 0.15s ease, margin 0.2s ease;
+    margin-top: 0;
+}
+.icon-select-popup.open {
+    max-height: 600px;
+    opacity: 1;
+    margin-top: 6px;
+}
+
+.icon-select-grid {
+    display: grid;
+    gap: 6px;
+    padding: 6px;
+    border: 1px solid var(--border-color);
+    border-radius: var(--radius);
+    background: var(--bg-color);
+}
+
+.icon-select-cell {
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    gap: 4px;
+    padding: 10px 6px;
+    border: 2px solid transparent;
+    border-radius: var(--radius);
+    background: var(--bg-secondary);
+    cursor: pointer;
+    transition: border-color 0.15s, background 0.15s, transform 0.1s;
+    text-align: center;
+}
+.icon-select-cell:hover {
+    border-color: var(--primary-color);
+    transform: scale(1.03);
+}
+.icon-select-cell.active {
+    border-color: var(--primary-color);
+    background: color-mix(in srgb, var(--primary-color) 12%, var(--bg-secondary));
+}
+
+.icon-select-cell-icon {
+    display: flex;
+    align-items: center;
+    justify-content: center;
+}
+.icon-select-cell-icon .icon {
+    width: 24px;
+    height: 24px;
+}
+.icon-select-cell.active .icon-select-cell-icon .icon {
+    stroke: var(--primary-color);
+}
+.icon-select-cell-label {
+    font-size: 0.85rem;
+    font-weight: 600;
+    line-height: 1.2;
+}
+.icon-select-cell-desc {
+    font-size: 0.72rem;
+    opacity: 0.6;
+    line-height: 1.3;
+}
+
+/* Hide descriptions on narrow screens */
+@media (max-width: 480px) {
+    .icon-select-cell-desc { display: none; }
+    .icon-select-cell { padding: 8px 4px; }
+    .icon-select-grid { gap: 4px; padding: 4px; }
+}