feat: add generation cancel job functionality and improve job handling

- Introduced `generationCancelJob` command ID in `commands/ids.ts`.
- Added `GenerationCancelJobPayload` type in `commands/payloads.ts`.
- Enhanced job status to include "cancelled" in `editor/state.ts`.
- Updated `runGenerationJob` to accept an `AbortSignal` and handle cancellation.
- Implemented cancellation logic in `runGenerate` and related functions.
- Added tests for job cancellation in `operations/generation/workflow.test.ts`.
- Improved layer rendering logic to prevent stack overflow in `editor/document-indexes.ts`.
- Added raster size assertions in `platform/browser/rasterLimits.ts` for image processing limits.
- Enhanced image file handling to check for size limits in `platform/browser/imageFiles.ts`.
- Updated UI components to reflect job cancellation state in `view/GenerationJobStatus.tsx` and `view/bottom-controls/GenerateActionControls.tsx`.

commands/ids.ts

@@ -48,6 +48,7 @@ export const commandIds = {
   generationStartJob: "generation.startJob",
   generationSucceedJob: "generation.succeedJob",
   generationFailJob: "generation.failJob",
+  generationCancelJob: "generation.cancelJob",
   generationLoadResources: "generation.loadResources",
   generationSetResources: "generation.setResources",
   generationFailResources: "generation.failResources",