Add 19 new Bambu Lab colors and fix sale banner display

Added 16 new PLA Matte refill-only colors and 3 PLA Wood spool-only colors.
Updated admin panel to automatically handle Matte prefix and Wood finish.
Fixed sale banner not displaying due to expired sale dates.
Updated all active sales to expire in 7 days (November 7, 2025).

src/data/bambuLabColors.ts

@@ -141,7 +141,25 @@ export const bambuLabColors: Record<string, ColorMapping> = {
   'White Marble': { hex: '#F7F3F0' },
   'White Oak': { hex: '#D2CCA2' },
   'Yellow': { hex: '#F4EE2A' },
-  
+
+  // PLA Matte - New Colors (2025)
+  'Matte Apple Green': { hex: '#C6E188' },
+  'Matte Bone White': { hex: '#C8C5B6' },
+  'Matte Caramel': { hex: '#A4845C' },
+  'Matte Dark Blue': { hex: '#042F56' },
+  'Matte Dark Brown': { hex: '#7D6556' },
+  'Matte Dark Chocolate': { hex: '#4A3729' },
+  'Matte Dark Green': { hex: '#68724D' },
+  'Matte Dark Red': { hex: '#BB3D43' },
+  'Matte Grass Green': { hex: '#7CB342' },
+  'Matte Ice Blue': { hex: '#A3D8E1' },
+  'Matte Lemon Yellow': { hex: '#F7D959' },
+  'Matte Lilac Purple': { hex: '#AE96D4' },
+  'Matte Plum': { hex: '#851A52' },
+  'Matte Sakura Pink': { hex: '#E8AFCF' },
+  'Matte Sky Blue': { hex: '#73B2E5' },
+  'Matte Terracotta': { hex: '#A25A37' },
+
   // Default fallback
   'Unknown': { hex: '#CCCCCC' }
 };