fix: invert shopping list icons to black in light mode

White PNG icons were invisible on light backgrounds. Added semantic
--shopping-icon-filter variable (invert(1) in light, none in dark)
applied to card and picker icons.

package.json

@@ -1,6 +1,6 @@
 {
 	"name": "homepage",
-	"version": "1.13.2",
+	"version": "1.13.3",
 	"private": true,
 	"type": "module",
 	"scripts": {