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Addresses @EnxDev's review on #41133: - Soft timeouts now abort the export instead of being caught per chart: the per-chart SoftTimeLimitExceeded handler (and screenshot.py's broad except) re-raise, so the outer handler emails a failure and runs cleanup rather than running to the hard limit (leaking temp files, holding the lock). Removes the now-dead ERROR_TIMEOUT reason. - Concurrency guard uses a shared, atomic DistributedLock (Redis when configured, metadata DB otherwise) instead of cache_manager.cache, which is a no-op under the default NullCache and process-local under SimpleCache. The lock is released if apply_async fails so a broker outage can't block exports until the TTL expires. - boto3 is declared via a new `excel-export` optional extra; superset.utils.s3 raises an actionable install hint when it is missing. - "Export Images to Excel" is gated on the webdriver screenshot feature flags (it renders via the headless webdriver); documents EXCEL_EXPORT_TABLE_VIZ_TYPES and the image mode in the config docs and UPDATING.md. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>