Add smooth animations across WebUI for modern feel

- Tab panels: fade-in with subtle translateY on switch
- Cards: hover lift (translateY -2px), staggered entrance animation
- Modals: spring-curve entrance with backdrop blur
- Buttons: press feedback (scale down on :active)
- Toggle switches: spring overshoot on knob transition
- Toast: smooth bounce-in replaces jarring shake
- Sections: animated height collapse/expand with chevron rotation
- Command palette: slide-down entrance animation
- Theme switch: smooth color transitions on key elements
- Dashboard: section collapse animation, target row hover
- Respects prefers-reduced-motion globally

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

server/src/wled_controller/static/css/dashboard.css

@@ -23,6 +23,7 @@
     color: var(--text-secondary);
     width: 10px;
     display: inline-block;
+    transition: transform 0.2s ease;
 }
 
 .dashboard-section-count {
@@ -80,6 +81,11 @@
     border: 1px solid var(--border-color);
     border-radius: 6px;
     margin-bottom: 4px;
+    transition: box-shadow 0.2s ease, transform 0.2s ease;
+}
+
+.dashboard-target:hover {
+    box-shadow: 0 2px 8px var(--shadow-color);
 }
 
 .dashboard-target-info {