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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