feat: add inpaint region functionality and related tools

- Enhanced cursor behavior for new tools: semantic select, mask lasso, and mask rectangle.
- Updated mask edit state to include mask asset ID and kind.
- Implemented inpaint region commands for adding, applying, and removing inpaint regions.
- Introduced new operations for lasso and semantic selection tools.
- Created UI components for candidate review and inpaint region management.
- Added tests for inpaint region commands to ensure functionality.
- Updated various components to support new inpaint features and improve user experience.

platform/browser/maskRaster.test.ts

@@ -1,5 +1,5 @@
 import { describe, expect, test } from "bun:test";
-import { blurMaskValues, cropMaskValuesToRgba, dilateMaskValues, erodeMaskValues, expandRectWithinBounds, invertMaskValues } from "./maskRaster";
+import { blurMaskValues, cropMaskValuesToRgba, dilateMaskValues, erodeMaskValues, expandRectWithinBounds, invertMaskValues, limitMaskValues } from "./maskRaster";
 
 describe("mask raster utilities", () => {
   test("exports the normalized drawn mask without filling the whole crop", () => {
@@ -35,6 +35,15 @@ describe("mask raster utilities", () => {
     expect([...erodeMaskValues(new Uint8ClampedArray(new Array(9).fill(255)), 3, 3, 1)]).toEqual(new Array(9).fill(255));
     expect([...blurMaskValues(values, 3, 3, 1)]).toEqual(new Array(9).fill(28));
   });
+
+  test("clips AI edit regions to a retained source crop", () => {
+    expect([...limitMaskValues(new Uint8ClampedArray(16).fill(255), 4, 4, { x: 1, y: 1, w: 2, h: 2 })]).toEqual([
+      0, 0, 0, 0,
+      0, 255, 255, 0,
+      0, 255, 255, 0,
+      0, 0, 0, 0,
+    ]);
+  });
 });
 
 function activeRedPixels(rgba: Uint8ClampedArray) {