fix(sim): harden execution cancel durability

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: 2 people

apps/sim/app/api/workflows/[id]/executions/[executionId]/cancel/route.test.ts

@@ -104,7 +104,7 @@ describe('POST /api/workflows/[id]/executions/[executionId]/cancel', () => {
     await expect(response.json()).resolves.toEqual({
       success: false,
       executionId: 'ex-1',
-      redisAvailable: false,
+      redisAvailable: true,
       durablyRecorded: false,
       reason: 'redis_write_failed',
     })

apps/sim/app/api/workflows/[id]/executions/[executionId]/cancel/route.ts

@@ -49,7 +49,7 @@ export async function POST(
     return NextResponse.json({
       success: cancellation.durablyRecorded,
       executionId,
-      redisAvailable: cancellation.durablyRecorded,
+      redisAvailable: cancellation.reason !== 'redis_unavailable',
       durablyRecorded: cancellation.durablyRecorded,
       reason: cancellation.reason,
     })