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`.

operations/generation/generationJob.ts

@@ -6,7 +6,8 @@ export async function runGenerationJob(options: {
   kind: GenerationJobKind;
   label: string;
   dispatch: AppStore["dispatch"];
-  task: () => Promise<void>;
+  signal: AbortSignal;
+  task: (signal: AbortSignal) => Promise<void>;
 }): Promise<void> {
   const jobId = crypto.randomUUID();
   const startedAt = Date.now();
@@ -14,9 +15,13 @@ export async function runGenerationJob(options: {
   if (!nextState.editor.generation.jobs.some((job) => job.id === jobId && job.status === "running")) return;
 
   try {
-    await options.task();
+    await options.task(options.signal);
     options.dispatch(commandIds.generationSucceedJob, { jobId, finishedAt: Date.now() });
   } catch (reason: unknown) {
+    if (options.signal.aborted) {
+      options.dispatch(commandIds.generationCancelJob, { jobId, finishedAt: Date.now() });
+      return;
+    }
     options.dispatch(commandIds.generationFailJob, {
       jobId,
       finishedAt: Date.now(),