Cap LITE at one FAVORITED recipe

Freeing the FAVORITED tab for LITE put no ceiling on the list, and a list
of your own picks is what PRO is selling. One star is free, the second
names the build; un-starring stays open so the list can always come back
under the limit.

src/utils/entitlement.ts

@@ -16,9 +16,9 @@ export const IS_PRO = IS_PRO_BUILD;
 //
 // What LITE owns outright: the eight film sims, the bundled recipes, its own
 // recipes up to LITE_RECIPE_LIMIT, its own watermark text (in one face), the
-// plain frames and every parameter. What needs PRO: the three printed frames,
-// the GPS stamp, the platform's other fonts, and the next recipe past the
-// limit.
+// plain frames, one favorite and every parameter. What needs PRO: the three
+// printed frames, the GPS stamp, the platform's other fonts, the next recipe
+// past the limit, and the second favorite.
 
 // Frames on the LITE side: the plain export only. The three printed looks are
 // PRO (the artwork/card geometry is the paid half of the FRAME tab).
@@ -28,6 +28,11 @@ export const PRO_FRAMES: FrameId[] = ['classic-white', 'polaroid', 'wallframe'];
 // free, deleting one is PRO — so a LITE list only ever grows to this size.
 export const LITE_RECIPE_LIMIT = 3;
 
+// FAVORITED is a LITE feature, but only one deep: the first star is free, the
+// second needs PRO. Un-starring is always free, so the list can always come
+// back under the limit.
+export const LITE_FAVORITE_LIMIT = 1;
+
 // Burned into every LITE export, bottom-right of the photo/frame area. Fractions
 // of the stamp canvas, same space the custom mark uses. The user's own mark is
 // free on top of it.