Implemented dual-nozzle AMS wiring visualization

- Added AMSSectionDual component with CSS border-based wiring
- Wiring connects AMS slots to hub to extruder with proper 90° corners
- Supports future dynamic filament color display
- Added TemperatureColumn with dual nozzle L/R display
- Added JogPad, BedControls, ExtruderControls components
- Added various control page icons

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

frontend/src/index.css

@@ -1,7 +1,9 @@
 @import "tailwindcss";
-
 @import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');
 
+/* Enable class-based dark mode for Tailwind v4 */
+@custom-variant dark (&:where(.dark, .dark *));
+
 @theme {
   /* Bambu Lab brand colors - always the same */
   --color-bambu-green: #00ae42;
@@ -89,3 +91,22 @@ body {
 .animate-slide-in {
   animation: slide-in 0.2s ease-out;
 }
+
+/* Theme-aware icon inversion - only invert in dark mode */
+.icon-theme {
+  opacity: 0.5;
+}
+
+.dark .icon-theme {
+  filter: invert(1);
+  opacity: 0.4;
+}
+
+/* Jogpad theme styling - darken background in dark mode */
+.jogpad-theme {
+  /* Light mode - normal */
+}
+
+.dark .jogpad-theme {
+  filter: brightness(0.7) contrast(1.1);
+}