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`.

view/bottom-controls/GenerateActionControls.tsx

@@ -36,6 +36,7 @@ export function GenerateActionControls({ settings, generation, dispatch, workflo
       </button>
       {preconditionMessage ? <span className="max-w-72 text-xs text-white/55" role="status">{preconditionMessage}</span> : null}
       <GenerationJobStatus generation={generation} />
+      {busy ? <button type="button" className="h-9 rounded-full bg-white/5 px-3 text-xs font-semibold text-white/70 hover:bg-white/10 hover:text-white" onClick={workflow.cancel}>Cancel</button> : null}
       {candidate ? (
         <>
           <CandidatePicker generation={generation} dispatch={dispatch} />