feat: add layer mode support in overlay transformations and update URL generation tests

- Enhanced the `processOverlay` function to include a new `layerMode` property for overlays.
- Updated the URL generation tests to include new transformation parameters such as `aiEdit`, `colorReplace`, and `distort`.
- Added comprehensive tests for various layer modes (multiply, cutter, cutout, displace) to ensure correct URL generation.

Author: manu4543

src/constants/supportedTransforms.ts

@@ -39,13 +39,16 @@ export const supportedTransforms: { [key: string]: string } = {
   aiVariation: "e-genvar",
   aiDropShadow: "e-dropshadow",
   aiChangeBackground: "e-changebg",
+  aiEdit: "e-edit",
   aiRemoveBackground: "e-bgremove",
   aiRemoveBackgroundExternal: "e-removedotbg",
   contrastStretch: "e-contrast",
   shadow: "e-shadow",
   sharpen: "e-sharpen",
   unsharpMask: "e-usm",
   gradient: "e-gradient",
+  colorReplace: "cr",
+  distort: "e-distort",
 
   // Other flags & finishing
   progressive: "pr",
@@ -56,6 +59,7 @@ export const supportedTransforms: { [key: string]: string } = {
   trim: "t",
   zoom: "z",
   page: "pg",
+  layerMode: "lm",
 
   // Text overlay transformations which are not defined yet
   fontSize: "fs",