Sync errors were silently swallowed — the player had no feedback when a
pull failed due to network issues or an expired session. Now `poll_pull_result`
emits a `WarningToastEvent` with a human-readable message for every error
variant, and reopens the Connect modal on auth failure so the player can
re-enter credentials without navigating through Settings.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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