feat(image): add rounded-square and squircle crop tool (#602)

Adds a Rounded Crop image tool for logo, favicon, and app-icon work. It masks the framed square to a rounded rectangle (with a corner-radius control) or an iOS-style squircle, reusing circle-crop's zoom/offset framing, border ring, background fill, and output-size options. Includes translations across all 21 locales.

Closes #601

packages/shared/src/constants.ts

@@ -698,6 +698,27 @@ const BASE_TOOLS: Tool[] = [
     acceptedInputs: IMAGE_INPUTS,
     executionHint: "fast",
   },
+  {
+    id: "rounded-crop",
+    name: "Rounded Crop",
+    description: "Crop image to a rounded square or squircle with transparent corners",
+    category: "layout",
+    icon: "Squircle",
+    route: "/rounded-crop",
+    modality: "image",
+    acceptedInputs: IMAGE_INPUTS,
+    executionHint: "fast",
+    keywords: [
+      "rounded corners",
+      "rounded square",
+      "squircle",
+      "favicon",
+      "app icon",
+      "logo",
+      "avatar",
+      "corner radius",
+    ],
+  },
   {
     id: "duotone",
     name: "Duotone",