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).

database/migrations/019_add_new_bambu_colors_2025.sql

@@ -0,0 +1,77 @@
+-- Migration: Add new Bambu Lab PLA Matte and PLA Wood colors (2025)
+-- This migration adds the new color offerings from Bambu Lab
+
+-- Add new PLA Matte colors to the colors table
+INSERT INTO colors (name, hex) VALUES
+    ('Matte Apple Green', '#C6E188'),
+    ('Matte Bone White', '#C8C5B6'),
+    ('Matte Caramel', '#A4845C'),
+    ('Matte Dark Blue', '#042F56'),
+    ('Matte Dark Brown', '#7D6556'),
+    ('Matte Dark Chocolate', '#4A3729'),
+    ('Matte Dark Green', '#68724D'),
+    ('Matte Dark Red', '#BB3D43'),
+    ('Matte Grass Green', '#7CB342'),
+    ('Matte Ice Blue', '#A3D8E1'),
+    ('Matte Lemon Yellow', '#F7D959'),
+    ('Matte Lilac Purple', '#AE96D4'),
+    ('Matte Plum', '#851A52'),
+    ('Matte Sakura Pink', '#E8AFCF'),
+    ('Matte Sky Blue', '#73B2E5'),
+    ('Matte Terracotta', '#A25A37')
+ON CONFLICT (name)
+DO UPDATE SET hex = EXCLUDED.hex;
+
+-- Add new PLA Wood colors to the colors table
+INSERT INTO colors (name, hex) VALUES
+    ('Ochre Yellow', '#BC8B39'),
+    ('White Oak', '#D2CCA2'),
+    ('Clay Brown', '#8E621A')
+ON CONFLICT (name)
+DO UPDATE SET hex = EXCLUDED.hex;
+
+-- Add PLA Matte filaments (all Refill only - 1 refill each, 0 spool)
+INSERT INTO filaments (tip, finish, boja, refill, spulna, kolicina, cena)
+SELECT
+    'PLA' as tip,
+    'Matte' as finish,
+    c.name as boja,
+    1 as refill,
+    0 as spulna,
+    1 as kolicina,
+    '3499' as cena
+FROM colors c
+WHERE c.name IN (
+    'Matte Apple Green', 'Matte Bone White', 'Matte Caramel',
+    'Matte Dark Blue', 'Matte Dark Brown', 'Matte Dark Chocolate',
+    'Matte Dark Green', 'Matte Dark Red', 'Matte Grass Green',
+    'Matte Ice Blue', 'Matte Lemon Yellow', 'Matte Lilac Purple',
+    'Matte Plum', 'Matte Sakura Pink', 'Matte Sky Blue', 'Matte Terracotta'
+)
+AND NOT EXISTS (
+    SELECT 1 FROM filaments f
+    WHERE f.tip = 'PLA'
+    AND f.finish = 'Matte'
+    AND f.boja = c.name
+);
+
+-- Add PLA Wood filaments (all Spool only - 0 refill, 1 spool each)
+INSERT INTO filaments (tip, finish, boja, refill, spulna, kolicina, cena)
+SELECT
+    'PLA' as tip,
+    'Wood' as finish,
+    c.name as boja,
+    0 as refill,
+    1 as spulna,
+    1 as kolicina,
+    '3999' as cena
+FROM colors c
+WHERE c.name IN (
+    'Ochre Yellow', 'White Oak', 'Clay Brown'
+)
+AND NOT EXISTS (
+    SELECT 1 FROM filaments f
+    WHERE f.tip = 'PLA'
+    AND f.finish = 'Wood'
+    AND f.boja = c.name
+);