feat: resilient thumbnail loading with backoff retries

Backend generates thumbnails on-demand via Celery, so the first request
often 404s while the worker runs. Auto-retry with 1.5s/3.5s/6s backoff,
manual retry fallback, and proper timer cleanup so fast-scrolling a
virtualized timeline doesn't setState on unmounted components.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
2026-04-07 07:59:03 +02:00
parent 78e12e8309
commit 72d301a9c7
2 changed files with 95 additions and 24 deletions

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