feat: register stitch tool in shared constants and i18n

packages/shared/src/constants.ts

@@ -276,6 +276,14 @@ export const TOOLS: Tool[] = [
     icon: "LayoutGrid",
     route: "/collage",
   },
+  {
+    id: "stitch",
+    name: "Stitch",
+    description: "Join images side by side or top to bottom",
+    category: "layout",
+    icon: "Columns",
+    route: "/stitch",
+  },
   {
     id: "split",
     name: "Image Splitting",

packages/shared/src/i18n/en.ts

@@ -86,6 +86,7 @@ export const en = {
       description: "Read QR codes and barcodes from images",
     },
     collage: { name: "Collage / Grid", description: "Combine images into a grid layout" },
+    stitch: { name: "Stitch", description: "Join images side by side or top to bottom" },
     split: { name: "Image Splitting", description: "Split image into grid parts" },
     border: { name: "Border & Frame", description: "Add borders, rounded corners, shadows" },
     "svg-to-raster": {