fix(telegram): auto-reconnect polling after network interruption - #2517
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Closes #2476 The polling error callback previously only handled Conflict errors (409 from multiple getUpdates callers). All other errors, including NetworkError and TimedOut that python-telegram-bot raises when the host loses connectivity (Mac sleep, WiFi switch, VPN reconnect), were logged and silently discarded. The bot would stop responding until manually restarted. Fix: - Add _looks_like_network_error() to classify transient connectivity errors (NetworkError, TimedOut, OSError, ConnectionError). - Add _handle_polling_network_error() with exponential back-off reconnect: retries up to 10 times with delays 5s, 10s, 20s, 40s, 60s (capped). On exhaustion, marks the adapter retryable-fatal so launchd/systemd can restart the gateway process. - Refactor _polling_error_callback() to route network errors to the new handler before falling through to a generic error log. - Track _polling_network_error_count (reset on successful reconnect) independently from _polling_conflict_count.
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Cherry-pick of #2477 by @Mibayy. Fixes #2476.
Network errors (Mac sleep, WiFi switch, VPN) silently killed Telegram polling. Adds exponential backoff reconnect (5s→60s, 10 attempts) matching the existing conflict handler pattern. Retryable-fatal after exhaustion so supervisors can restart.