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The browser previously retried every failed shared high-score submission on the 50 ms polling interval. With server-side rate limiting and database load shedding, immediate 429 and 503 responses could create a tight retry loop. Add a bounded exponential delay with jitter, honor Retry-After on transient responses, and reset the delay after a successful submission. Keep the pending revision retryable without allowing overlapping requests. Test Plan: - `node --check tdkpin-rs/web/storage.js` -- passed - `prettier --check tdkpin-rs/web/storage.js` -- passed - Node VM retry timing harness covering Retry-After, backoff, and reset -- passed - `git diff --cached --check` -- passed