feat: implement inpainting functionality with mask handling

- Added `createMaskedPixelReplacementSource` function to handle pixel replacement using inpainting.
- Introduced `buildInpaintBundle` to prepare inpainting data including mask generation and validation.
- Created utility functions for mask operations such as `applyMaskedContentModeToRgba`, `expandRectWithinBounds`, and others for mask manipulation.
- Developed tests for inpainting preparation and mask raster utilities to ensure functionality and correctness.
- Implemented mask raster operations including inversion, feathering, blurring, and more.

view/App.tsx

@@ -25,7 +25,7 @@ export type AppProps = {
 
 export function App({ app }: AppProps) {
   const shellState = useAppState(app.store, selectAppShellState, shallowEqual);
-  const { document, selection, viewport, tools, transformSession, maskEdit } = shellState;
+  const { document, selection, viewport, tools, generation, transformSession, maskEdit } = shellState;
   const viewportActivityIsland = useViewportActivityIsland(viewport);
   const imageImport = useImageImport(app.store);
   const [layersOpen, setLayersOpen] = useState(false);
@@ -161,6 +161,7 @@ export function App({ app }: AppProps) {
           activeTool={tools.activeTool}
           brushSettings={tools.brush}
           generateSettings={tools.generate}
+          generation={generation}
           chromaKeySettings={tools.chromaKey}
           magicWandSettings={tools.magicWand}
           editingMask={Boolean(maskEdit)}
@@ -189,6 +190,7 @@ type AppShellState = {
   selection: AppState["editor"]["selection"];
   viewport: AppState["editor"]["viewport"];
   tools: AppState["editor"]["tools"];
+  generation: AppState["editor"]["generation"];
   transformSession: AppState["editor"]["transformSession"];
   maskEdit: AppState["editor"]["maskEdit"];
 };
@@ -199,6 +201,7 @@ function selectAppShellState(state: AppState): AppShellState {
     selection: state.editor.selection,
     viewport: state.editor.viewport,
     tools: state.editor.tools,
+    generation: state.editor.generation,
     transformSession: state.editor.transformSession,
     maskEdit: state.editor.maskEdit,
   };